Interventions for vision impairments post brain injury: Use of prisms and exercises. Dr Kevin Houston Talia Mouldovan
|
|
- Georgia Daniel
- 5 years ago
- Views:
Transcription
1 Interventions for vision impairments post brain injury: Use of prisms and exercises Dr Kevin Houston Talia Mouldovan
2 Disclosures Dr. Houston: EYEnexo LLC, EyeTurn app Apps discussed are prototypes and are not being promoted for sale.
3 Vision Rehabilitation Use of lenses, visual assistive devices, therapies, environmental modifications and strategies to enhance vision and minimize functional impairments caused by vision loss
4 Spaulding Rehabilitation Hospital Boston
5 Terminology Esotropia (deviated in) Exotropia (out) Hypertropia (up) Hypotropia (down)
6 Rates of Strabismus at Spaulding 110 cases August 2015 to March 2016 Most common: CN III, IV, VI, convergence insufficiency
7 Diagnosing Strabismus Cover Test with Prism Neutralization Hirschberg/ Krimsky test
8 Diagnosis: Motor Field Test Measure strabismus in different positions of gaze
9 Ocular Convergence Activation of both medial recti to rotate the eyes inward, typically for near viewing
10 Diplopia, Visual Confusion, Rivalry, & Suppression Diplopia (Double Vision): Seeing the same object twice Visual Confusion (Overlapping images): Seeing different visual stimuli in the same visual direction Rivalry: Competition between the eyes when visual information does not match Suppression: Neurological process of actively inhibiting visual input from part of the vision, typically of one eye
11 Cranial Nerves Involved in Eye Movement CN III Palsy Signs: Lid down, pupil affected, eye down and out CN IV Signs: Head tilt, blurred vision, worse on downgaze, balance CN VI Signs: Worse at distance, cross eyed, head turn
12 What can you observe?
13 Strabismus Assessment Pearls The amount of strabismus can be very small It may not be noticeable Patient may not report double vision
14 What is it like to have strabismus? Normal View
15 Exotropia = double vision & visual confusion
16 Illustration of Vertical Strabismus
17
18 Reports Blurry Vision Closes one eye Dizziness and Imbalance Avoids Participating Tilting/turning head
19 Disadvantages of Patching Appearance ~20 degrees of peripheral vision loss May discourage recovery Affects Spatial Attention Patients are often not satisfied with this approach
20 Other Treatments Prisms Vision Therapy Therapy + Prisms Surgery
21 Prism A mystical optical element splits light into component colors?
22 Ophthalmic Prisms Shift light instead of focusing, color dispersion is minimal Image Apex Light Direction of image shift Base
23 If you look through a prism Image shifted towards apex (thin side) Apex 3.5 deg base down Direction of image shift Base
24 Designs of Prisms: Standard Prism vs. Fresnel Standard Photo illustratio n next slide Fresnel
25 10 degree standard vs. 20 degree Fresnel The Fresnel = an important advance for clinical application of prisms Up to 30 degrees
26 Application for Strabismus Fit over entire lens of one eye to optically align the images seen by the two misaligned eyes. Base Out Base In
27 Prisms Facilitate Fusional Convergence
28 Prisms: An assistive device for Strabismus Reduce the amount of fusional vergence needed Fit over entire lens of one eye to optically align the images seen by the two misaligned eyes. *Prisms for strabismus well accepted in mainstream Ophthalmology/Optometry
29 Important to be aware of side effects All prisms cause chromatic aberration and distortion Press-on prisms cause additional blur (filmy vision) Lessened angle of strabismus is sometimes more bothersome harder to ignore double image This is monitored closely
30 Actual Photo Through a 10 degree Press-on Fresnel Prism View Actual View
31 Spaulding Vision Rehab 1) environmental adaptation & postural adaptation to improve function; 2) neuro-muscular re-education with oculomotor vision therapy to maximize recovery
32 Patient with R CN III palsy: When she looks right (or postures with a left head turn) she gets single vision When she looks left (or postures with a right head turn) she gets double vision
33 Flowcharts for Postural Modifications 3rd Postural adaptations Right Eye Affected Left Eye Affected Turn L Turn R Distance Easier, Move Further Distance Easier, Move Further *Cue to focus hard to eliminate diplopia Right Eye Affected 4th Left Eye Affected Bring reading material up &/or tilt chin in Tilt head L Tilt head R 6th Right Eye Affected Left Eye Affected Turn R Turn L Move Closer Move Closer *Cue to relax gaze to eliminate diplopia Turn head L Turn head R
34 Our eyes moves naturally, isn t that enough? Avoidance with head posture Disuse syndrome of ocular muscles No attempted vergence Atrophy eventually *Disuse is not referring to amblyopia. Not a concern in adults. Disuse refers to avoid making eye movement into paretic field
35 Vision Interventions 3 rd Nerve 4 th Nerve 6 th Nerve Binocular Impairments Hemianopia
36 Vision Exercises Oculomotor strengthening Improve fusion/single image Improve vergence
37 Pursuits Oculomotor Strengthening O, X, H Saccades Thumb saccades
38 Alternate Cover, Cover-UnCover Stabilize head in straight ahead position and look at target (smaller targets are more difficult) Alternate covering each eye several times while looking at a target Uncover both eyes and try to fuse into one image
39 Head Turns Look at target (starts as double) and slowly rotate head to move images closer together to become single Check the postural modification cheat sheet To determine which direction should lessen the misalignment
40 Vestibulo-Ocular Reflex
41 Vergence Exercises Pencil Push Ups Brock String Fusion Cards Divergence Convergence _sizedist&ttl=size%20and%20distance
42 Brock String Convergence or Divergence: Moving the x of the string closer and further away Slow: slowly move the bead toward or away from the nose Fast: jumping between looking at several beads /Brock-String-Devices
43 Free-space Fusion Cards Lifesaver cards
44 Protocols: Oculomotor Therapy Bottom Up Top Down Vestibular Ocular Reflex Retinal Disparity/Refixation Motor Priming Volitional FEF to brainstem Repetitive Head Rotations Single to Double Alternate Cover Repetition Repetitive Saccades (Head Stabilized) OCULOMOTOR THERAPY GOALS: 1) Maximize Neuromuscular Recovery 2) Prevent Disuse Atrophy 3) Prevent Contracture 4) Motor Adaptation 5) Recruitment 6) Psychological Benefit
45 Frequency Wear prism glasses as often as possible Exercises ideally 3 sessions per week for 30 minutes each 2 minute minimum per task or reps
46 Ensure binocularity Troubleshooting Are they blocking or closing one eye? Make sure both eyes are fixating Watch for suppression Avoid Compensation Are they rotating their head when it should be stable? Find the best position before starting Examples: Establish sight of a single pencil before bringing it closer Adjust head, string or bead position until they see the x of the brock string
47 Questions?
STUDY OF ADULT STRABISMUS TESTING PROCEDURES MANUAL
STUDY OF ADULT STRABISMUS TESTING PROCEDURES MANUAL Version 3.0 July 13, 2016 SAS1 s Manual_v3.0_7-13-16 1 CONVERGENCE INSUFFICIENCY SYMPTOM SURVEY (CISS)... 3 Convergence Insufficiency Symptom Survey
More informationNeutralizing pattern deviations in
Brit. J. Ophthal. (I 970) 54, 19 I Neutralizing pattern deviations in ocular motility MARTIN J. URIST From the Motility Clinic of the Illinois Eye and Ear Infirmary, Universitv of Illinois (ollege of Medicine,
More informationensory System III Eye Reflexes
ensory System III Eye Reflexes Quick Review from Last Week Eye Anatomy Inside of the Eye choroid Eye Reflexes Eye Reflexes A healthy person has a number of eye reflexes: Pupillary light reflex Vestibulo-ocular
More informationAuthor: Ida Lucy Iacobucci, 2015
Author: Ida Lucy Iacobucci, 2015 License: Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution-NonCommercial-Share Alike 4.0 License: http://creativecommons.org/licenses/by-nc-sa/4.0/
More informationEXTRAOCULAR MUSCLES. Let s get oriented first. Learning Objectives: Extraocular Motility & Cover Testing. Course Title:
Course Title: Extraocular Motility & Cover Testing Learning Objectives: 1. Identify how to correctly perform the Muscle H test on a patient 2. Know which paired muscles are being tested in each cardinal
More information3 Clinical Pearls for Treating Vertical Deviations (3100) 6/23/2018 Jen Simonson, OD, FCOVD 1 Cope #54462-FV
Jen Simonson, OD, FCOVD Disclosures: Dr. Simonson is a co-founder of Gerull Labs (g-labs), the maker of the ipad Stereoscope and Opto app. Cope #54462-FV 1 2 Disclosures: Dr. Simonson has written and illustrated
More informationChapter 4 Assessment of Study Measures
Chapter 4: Assessment of Study Measures...2 4.1 Overview...2 4.1.1 Overview of Eligibility and Masked Examination Procedures...2 4.1.2 Equipment Needed for Masked Examination Procedures...3 4.2 Primary
More informationFitting Peripheral Prisms for Patients with Hemianopia. The workshop is sponsored by Chadwick Optical, Inc.
Fitting Peripheral Prisms for Patients with Hemianopia Eli Peli, MSc, OD, FAAO Professor of Ophthalmology, Harvard Medical School Moakley Scholar in Aging Eye Research Please silence all mobile devices
More informationSuch explanations do not take into account other environmental factors, such as a bad diet or poor. Causes:
Myopia (nearsightedness) Myopia is a name used to describe the refractive disorder known as nearsightedness. With nearsightedness, light rays from nearby objects focus on the retina, but distant objects
More informationSuppression in strabismus
British Journal ofophthalmology, 1984, 68, 174-178 Suppression in strabismus an update J. A. PRATT-JOHNSON AND G. TILLSON From the Department of Ophthalmology, University ofbritish Columbia, Vancouver,
More informationPatients in your area are ready to set appointments with you. Keep reading on to learn why they re eager to use our system.
Hello Doctor! If you re reading this, the person who gave it to you is one of over 11,000 people who visited our website looking for a provider of Vivid Vision - Vision Therapy in Virtual Reality. They
More informationExperiment HM-2: Electroculogram Activity (EOG)
Experiment HM-2: Electroculogram Activity (EOG) Background The human eye has six muscles attached to its exterior surface. These muscles are grouped into three antagonistic pairs that control horizontal,
More informationPeripheral Prism Glasses for Hemianopia Giorgi et al. APPENDIX 1
1 Peripheral Prism Glasses for Hemianopia Giorgi et al. APPENDIX 1 Monocular and binocular sector prisms are commonly used for hemianopia.3, 10, 14 The impact of these prisms on the visual field is not
More informationAspects of Vision. Senses
Lab is modified from Meehan (1998) and a Science Kit lab 66688 50. Vision is the act of seeing; vision involves the transmission of the physical properties of an object from an object, through the eye,
More informationRefraction, Lenses, and Prisms
CHAPTER 16 14 SECTION Sound and Light Refraction, Lenses, and Prisms KEY IDEAS As you read this section, keep these questions in mind: What happens to light when it passes from one medium to another? How
More informationABO Certification Training. Part I: Anatomy and Physiology
ABO Certification Training Part I: Anatomy and Physiology Major Ocular Structures Centralis Nerve Major Ocular Structures The Cornea Cornea Layers Epithelium Highly regenerative: Cells reproduce so rapidly
More informationVINCYP Glossary. The meaning of words used in vision reports
VINCYP VINCYP Glossary The meaning of words used in vision reports Accommodation Achromotopsia Agnosia ( visual ) Akinetopsia Amblyopia Aniridia Automatic adjustment to the shape of the lenses of both
More informationLearn Connect Succeed. JCAHPO Regional Meetings 2017
Learn Connect Succeed JCAHPO Regional Meetings 2017 Refractometry JCAHPO Continuing Education Program Phoenix and Scottsdale, AZ Craig Simms BSc, COMT, CDOS, ROUB Director of Education, IJCAHPO Program
More informationVan Orden Stars & Cheiroscopic Tracing
Van Orden Stars & Cheiroscopic Tracing Vision is not merely a matter of passive perception, it is an intelligent process of active construction. What you see is, invariably, what your visual intelligence
More informationSchedule of Workshop. 3 hours Actually means 3 X 50 Min = 2.5 Hours Finishing at 3:30PM. Fitting Peripheral Prisms for Patients with Hemianopia
Fitting Peripheral Prisms for Patients with Hemianopia Eli Peli, MSc, OD, FAAO Professor of Ophthalmology, Harvard Medical School Moakley Scholar in Aging Eye Research Please silence all mobile devices
More informationContact Lenses Didn t Work! Now What? Evaluation and Treatment of Aniseikonia
Contact Lenses Didn t Work! Now What? Evaluation and Treatment of Aniseikonia Andrew J Toole, OD, PhD, FAAO The Ohio State University College of Optometry Disclosure Statement: Nothing to disclose Aniseikonia
More information2/3/2016. How We Move... Ecological View. Ecological View. Ecological View. Ecological View. Ecological View. Sensory Processing.
How We Move Sensory Processing 2015 MFMER slide-4 2015 MFMER slide-7 Motor Processing 2015 MFMER slide-5 2015 MFMER slide-8 Central Processing Vestibular Somatosensation Visual Macular Peri-macular 2015
More informationHigh Touch High Tech
Vision and Perception Games Supplies: Print out of Muller-Lyer Illusion handout Print out of Vision Perception handout Color print out of Afterimage handout Color print out of Movement Illusion handout
More informationDriving simulators in hemianopia rehabilitation research
Schepens Eye Research Institute Massachusetts Eye and Ear Harvard Medical School Affiliate Driving simulators in hemianopia rehabilitation research Alex Bowers, PhD No disclosures Hemianopia Loss of half
More informationCERTIFICATE IN DISPENSING OPTICS (CDO) Term-End Examination June, 2015
No. of Printed Pages : 8 OAH-005 CERTIFICATE IN DISPENSING OPTICS (CDO) Term-End Examination June, 2015 OAH-005 : PROGRESSIVE LENS Time : 90 Minutes Maximum Marks : 30 Note : (i) (ii) (iii) (iv) There
More informationVision Shaping Treatment
JOHN WARREN, OD Vision Shaping Treatment WWW.WARRENEYECARECENTER.COM What Is VST? Using customized vision retainer lenses, VST reshapes the front surface of the eye, reducing nearsightedness and astigmatism
More informationOPTICAL DEMONSTRATIONS ENTOPTIC PHENOMENA, VISION AND EYE ANATOMY
OPTICAL DEMONSTRATIONS ENTOPTIC PHENOMENA, VISION AND EYE ANATOMY The pupil as a first line of defence against excessive light. DEMONSTRATION 1. PUPIL SHAPE; SIZE CHANGE Make a triangular shape with the
More informationLesson 8 EOG 1 Electrooculogram. Lesson 8 EOG 1 Electrooculogram. Page 1. Biopac Science Lab
Biopac Science Lab Lesson 8 EOG 1 Electrooculogram Lesson 8 EOG 1 Electrooculogram Physiology Lessons for use with the Biopac Science Lab MP40 PC running Windows XP or Mac OS X 10.3-10.4 David W. Pittman,
More information12.1. Human Perception of Light. Perceiving Light
12.1 Human Perception of Light Here is a summary of what you will learn in this section: Focussing of light in your eye is accomplished by the cornea, the lens, and the fluids contained in your eye. Light
More informationWhat do I need to know about multisensory interactions?
What do I need to know about multisensory interactions? Adolfo M. Bronstein Neuro-otology Unit Centre for Neuroscience Imperial College London Cortex: Conscious Perception Vertigo Brainstem: III/IV/VI
More informationSNC2D PHYSICS 5/25/2013. LIGHT & GEOMETRIC OPTICS L Converging & Diverging Lenses (P ) Curved Lenses. Curved Lenses
SNC2D PHYSICS LIGHT & GEOMETRIC OPTICS L Converging & Diverging Lenses (P.448-450) Curved Lenses We see the world through lenses even if we do not wear glasses or contacts. We all have natural lenses in
More informationVNG/ENG. To Preserve and Improve Balance VISUALEYES BINOCULAR GOGGLES
VNG/ENG VISUALEYES IS THE ASSESSMENT TOOL OF CHOICE TO IDENTIFY ABNORMALITIES WITHIN THE VESTIBULAR SYSTEM. OBJECTIVELY DOCUMENT ABNORMAL EYE MOVEMENTS CAUSED BY TRAUMATIC BRAIN INJURY (TBI); BENIGN PAROXYSMAL
More informationKeratometry: Vertical Axis. Axis
Keratometry: Step 1: FOCUS THE EYEPIECE Lower occluder, focus the keratometer light source on the occluder. Turn the eyepiece counter-clockwise until blurry, then rotate clockwise JUST until clear, no
More information2Win Binocular Mobile Refractometer and Vision Analyzer
2Win Binocular Mobile Refractometer and Vision Analyzer The smartest way to detect refractive errors and vision problems Adaptica was founded in 2009 as a spin-off of the University of Padova, Italy specialising
More informationA Checklist for Managing Spectacle Lens Complaints. Presented By: Raymond P. Dennis, M.A. (Ed.) Middlesex Community. Patient Complaints
SPEAKER FINANCIAL DISCLOSURE STATEMENT Raymond P. Dennis has occasionally received honoraria from Essilor of America to present generic continuing education presentations similar to this one. He is a member
More informationTopic 4: Lenses and Vision. Lens a curved transparent material through which light passes (transmit) Ex) glass, plastic
Topic 4: Lenses and Vision Lens a curved transparent material through which light passes (transmit) Ex) glass, plastic Double Concave Lenses Are thinner and flatter in the middle than around the edges.
More information3D Space Perception. (aka Depth Perception)
3D Space Perception (aka Depth Perception) 3D Space Perception The flat retinal image problem: How do we reconstruct 3D-space from 2D image? What information is available to support this process? Interaction
More informationVNG Balance Testing. VN415 / VO425 - Complete solutions for balance testing
VNG Balance Testing VN415 / VO425 - Complete solutions for balance testing Balance testing with VNG VN415/VO425 Video Nystagmography is the gold standard for observation, measurement and analysis of eye
More information3/31/2016. Presented by: Bob Alexander, ABOM/NCLE-AC Lens Consultant Vision Ease. Everywhere and Sportwrap; Understanding Digital Technology
Everywhere and Sportwrap; Understanding Digital Technology Presented by: Bob Alexander, ABOM/NCLE-AC Lens Consultant Vision Ease Digital - Design and Surfacing VE Digital Designs Optimization Compensation
More informationRETINOSCOPY LABORATORY MICHAEL DAVIDSON RON OFRI
RETINOSCOPY LABORATORY MICHAEL DAVIDSON RON OFRI Instrumentation: 1. Heine and Welch Allen retinoscopes 2. Luneau retinoscopy bars 3. Hiene practice eyes 4. 66cm and 50cm tape Basic Steps in Retinoscopy:
More informationG.P. MULTIFOCAL LENSES: A FITTING WORKSHOP
G.P. MULTIFOCAL LENSES: A FITTING WORKSHOP Susan J. Gromacki, OD, MS, FAAO, FSLS Daniel G. Fuller, OD, FAAO, FSLS Cornea, Contact Lenses and Refractive Technologies Section The American Academy of Optometry
More informationFundamentals of Progressive Lens Design
Fundamentals of Progressive Lens Design VisionCare Product News Volume 6, Number 9 September 2006 By Darryl Meister, ABOM Progressive Lens Surfaces A progressive addition lens (or PAL ) is a type of multifocal
More informationOptics Supplement. Christopher S. Wolfe, OD, FAAO
Optics Supplement Christopher S. Wolfe, OD, FAAO One of the most consistently difficult sections of the NBEO Part 1 exam has been optics. We feel that in order to truly master this material one must: 1.
More informationChoices and Vision. Jeffrey Koziol M.D. Thursday, December 6, 12
Choices and Vision Jeffrey Koziol M.D. How does the eye work? What is myopia? What is hyperopia? What is astigmatism? What is presbyopia? How the eye works How the Eye Works 3 How the eye works Light rays
More informationUNITY VIA PROGRESSIVE LENSES TECHNICAL WHITE PAPER
UNITY VIA PROGRESSIVE LENSES TECHNICAL WHITE PAPER UNITY VIA PROGRESSIVE LENSES TECHNICAL WHITE PAPER CONTENTS Introduction...3 Unity Via...5 Unity Via Plus, Unity Via Mobile, and Unity Via Wrap...5 Unity
More informationHuman Senses : Vision week 11 Dr. Belal Gharaibeh
Human Senses : Vision week 11 Dr. Belal Gharaibeh 1 Body senses Seeing Hearing Smelling Tasting Touching Posture of body limbs (Kinesthetic) Motion (Vestibular ) 2 Kinesthetic Perception of stimuli relating
More informationNote for all these experiments it is important to observe your subject's physical eye movements.
Experiment HM-3: Electroculogram Activity (EOG) Note for all these experiments it is important to observe your subject's physical eye movements. Exercise 1: Saccades Aim: To demonstrate the type of electrical
More informationThe Eye and Vision. Activities: Linda Shore, Ed.D. Exploratorium Teacher Institute Exploratorium, all rights reserved
The Eye and Vision By Linda S. Shore, Ed.D. Director,, San Francisco, California, United States lindas@exploratorium.edu Activities: Film Can Eyeglasses a pinhole can help you see better Vessels using
More informationHeidi Panchaud, Tammy Labreche
Heidi Panchaud, Tammy Labreche Review types of peripheral field loss Review common field enhancement options Training with prisms Care of prisms Training with reverse telescopes Binasal Hemianopia BitemporalHemianopia
More informationINTRODUCTION TO LENSOMETRY
INTRODUCTION TO LENSOMETRY Susan Brummett, COMT Little Rock, Arkansas January 2007 Terminology 1 Lensmeter instrument designed to measure the prescription of an optical lens. Also defined as an instrument
More informationVARILUX FITTING GUIDE GUIDELINES FOR SUCCESSFULLY FITTING VARILUX LENSES
VARILUX FITTING GUIDE GUIDELINES FOR SUCCESSFULLY FITTING VARILUX LENSES WELCOME We are pleased to present this guide which outlines the essential steps for successfully fitting progressive lenses to your
More informationState of the Science Symposium
State of the Science Symposium Virtual Reality and Physical Rehabilitation: A New Toy or a New Research and Rehabilitation Tool? Emily A. Keshner Department of Physical Therapy College of Health Professions
More informationWhat s a Corneal GP Lens?
Slide 1 What s a Corneal GP Lens? Richard Dorer NCLEC Blanchard Contact Lens Inc. 800-367-4009 x 131 richarddorer@gmail.com www.blanchardlab.com Slide 2 Endorsements I am a paid representative and consultant
More informationHeads you win, tails you lose
4 dispensingoptics September 2014 Heads you win, tails you lose By Andrew Keirl BOptom (Hons) MCOptom FBDO CompetencIes covered: Dispensing opticians: Ocular Examination, Contact Lenses, efractive Management
More informationStop and Think. Scenario. Vision
Stop and Think Scenario Customer who gets very vocal and anxious during travel, either in the bus, or in her adapted car. This can be very loud and prolonged causing staff that are driving to lose concentration.
More informationPhy Ph s y 102 Lecture Lectur 21 Optical instruments 1
Phys 102 Lecture 21 Optical instruments 1 Today we will... Learn how combinations of lenses form images Thin lens equation & magnification Learn about the compound microscope Eyepiece & objective Total
More informationChapter 29/30. Wave Fronts and Rays. Refraction of Sound. Dispersion in a Prism. Index of Refraction. Refraction and Lenses
Chapter 29/30 Refraction and Lenses Refraction Refraction the bending of waves as they pass from one medium into another. Caused by a change in the average speed of light. Analogy A car that drives off
More informationused to diagnose and treat medical conditions. State the precautions necessary when X ray machines and CT scanners are used.
Page 1 State the properties of X rays. Describe how X rays can be used to diagnose and treat medical conditions. State the precautions necessary when X ray machines and CT scanners are used. What is meant
More informationPhysics Chapter Review Chapter 25- The Eye and Optical Instruments Ethan Blitstein
Physics Chapter Review Chapter 25- The Eye and Optical Instruments Ethan Blitstein The Human Eye As light enters through the human eye it first passes through the cornea (a thin transparent membrane of
More informationMicromedical VisualEyes 515/525 VisualEyes 515/525
Micromedical VisualEyes 515/525 VisualEyes 515/525 Complete VNG solution for balance assessment Micromedical by Interacoustics Balance testing with VisualEyes 515/525 Video Nystagmography provides ideal
More informationEfficacy of the Pelli-Levi Dual Acuity Chart in diagnosing amblyopia
Draft 18 November 19, 2006 Efficacy of the Pelli-Levi Dual Acuity Chart in diagnosing amblyopia Kyle A. Eaton, OD Denis G. Pelli, PhD Dennis M. Levi, OD, PhD School of Optometry, University of California,
More informationConverging and Diverging Surfaces. Lenses. Converging Surface
Lenses Sandy Skoglund 2 Converging and Diverging s AIR Converging If the surface is convex, it is a converging surface in the sense that the parallel rays bend toward each other after passing through the
More informationPhys 102 Lecture 21 Optical instruments
Phys 102 Lecture 21 Optical instruments 1 Today we will... Learn how combinations of lenses form images Thin lens equation & magnification Learn about the compound microscope Eyepiece & objective Total
More informationHuman Neurophysiology Laboratory Manual. Laboratory 4. Vision
Department of Electrical and Computer Engineering University of Cyprus Human Neurophysiology Laboratory Manual Laboratory 4 Vision Nicosia 2006 2006 Constantinos Pitris Department of Electrical and Computer
More informationChoices and Vision. Jeffrey Koziol M.D. Friday, December 7, 12
Choices and Vision Jeffrey Koziol M.D. How does the eye work? What is myopia? What is hyperopia? What is astigmatism? What is presbyopia? How the eye works Light rays enter the eye through the clear cornea,
More informationInstruments Commonly Used For Examination of the Eye
Instruments Commonly Used For Examination of the Eye There are many instruments that the eye doctor might use to evaluate the eye and the vision system. This report presents some of the more commonly used
More informationLENSES. a. To study the nature of image formed by spherical lenses. b. To study the defects of spherical lenses.
Purpose Theory LENSES a. To study the nature of image formed by spherical lenses. b. To study the defects of spherical lenses. formation by thin spherical lenses s are formed by lenses because of the refraction
More informationOptics. Experiment #4
Optics Experiment #4 NOTE: For submitting the report on this laboratory session you will need a report booklet of the type that can be purchased at the McGill Bookstore. The material of the course that
More informationLecture Outline Chapter 27. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.
Lecture Outline Chapter 27 Physics, 4 th Edition James S. Walker Chapter 27 Optical Instruments Units of Chapter 27 The Human Eye and the Camera Lenses in Combination and Corrective Optics The Magnifying
More informationLecture 8. Human Information Processing (1) CENG 412-Human Factors in Engineering May
Lecture 8. Human Information Processing (1) CENG 412-Human Factors in Engineering May 30 2009 1 Outline Visual Sensory systems Reading Wickens pp. 61-91 2 Today s story: Textbook page 61. List the vision-related
More informationColor and Perception
Color and Perception Why Should We Care? Why Should We Care? Human vision is quirky what we render is not what we see Why Should We Care? Human vision is quirky what we render is not what we see Some errors
More informationSQUINT. angle of squint in each case is the same: in paralytic squint the sound eye fixes
288 POST-GRADUATE MEDICAL JOURNAL August, 1934 SQUINT. By C. L. GIMBLETT, M.D.(Camb), M.R.C.P.(Lond.), F.R.C.S.(Eng.), Surgeon, Royal Westminster Ophthalmic Hospital. A squint is detected, when a patient's
More informationSPHERE, CYLINDER, AXIS, and ADD Power: Why these four variables? Example Prescriptions: UNDERSTANDING A PRESCRIPTION SPHERICAL LENSES 8/31/2018
8/31/2018 UNDERSTANDING A PRESCRIPTION Speaker: Michael Patrick Coleman, COT & ABOC SPHERE, CYLINDER, AXIS, and ADD Power: Why these four variables? Example Prescriptions: +2.50 SPH Simple SPHERICAL Rx
More informationPHYSICS OPTICS. Mr Rishi Gopie
OPTICS Mr Rishi Gopie Ray Optics II Images formed by lens maybe real or virtual and may have different characteristics and locations that depend on: i) The type of lens involved, whether converging or
More informationFrom Neuroscience to Mechatronics
From Neuroscience to Mechatronics Fabian Diewald 19th April 2006 1 Contents 1 Introduction 3 2 Architecture of the human brain 3 3 The cerebellum responsible for motorical issues 3 4 The cerebellar cortex
More information30 Lenses. Lenses change the paths of light.
Lenses change the paths of light. A light ray bends as it enters glass and bends again as it leaves. Light passing through glass of a certain shape can form an image that appears larger, smaller, closer,
More informationCOMMUNICATIONS THE ACCOMMODATION REFLEX AND ITS STIMULUS* powerful stimulus to this innervation is to be found in the disparity
Brit. J. Ophthal., 35, 381. COMMUNICATIONS THE ACCOMMODATION REFLEX AND ITS STIMULUS* BY E. F. FINCHAM Ophthalmic Optics Department, Institute of Ophthalmology, London IT is well known in the practice
More informationMicromedical VisualEyes 515/525
Micromedical VisualEyes 515/525 Complete VNG solution for balance assessment Micromedical by Interacoustics Balance testing with VisualEyes 515/525 Videonystagmography provides ideal conditions for the
More informationOccupational Eye Disease
Occupational Eye Disease Dr. Alireza Safaeian Occupational Medicine Specialist Assistant Professor of Isfahan University of Medical Sciences Visual Assessment Visual Acuity Definition Visual acuity is
More informationEyes. Inspection Visual Acuity Visual Fields Pupillary Response Fundoscopic Exam
Eyes Inspection Visual Acuity Visual Fields Pupillary Response Fundoscopic Exam Eye Examination Inspection 11.Inspects external ocular (eye) structures (lids, conjunctiva, iris, cornea, pupils) 12.Gently
More informationThe people-based design
The people-based design InnoVision HOYA Vision Care Company always strives to develop new calculation techniques and optimisation methods that leads to the development of smarter lens designs. To enhance
More informationAuditory Biofeedback to Control Vertical and Horizontal Eye Movements in the Dark
Investigative Ophthalmology & Visual Science, Vol. 29, No. 12, December 1988 Copyright Association for Research in Vision and Ophthalmology Auditory Biofeedback to Control Vertical and Horizontal Eye Movements
More informationTSBB15 Computer Vision
TSBB15 Computer Vision Lecture 9 Biological Vision!1 Two parts 1. Systems perspective 2. Visual perception!2 Two parts 1. Systems perspective Based on Michael Land s and Dan-Eric Nilsson s work 2. Visual
More informationVision. The eye. Image formation. Eye defects & corrective lenses. Visual acuity. Colour vision. Lecture 3.5
Lecture 3.5 Vision The eye Image formation Eye defects & corrective lenses Visual acuity Colour vision Vision http://www.wired.com/wiredscience/2009/04/schizoillusion/ Perception of light--- eye-brain
More informationNANOS Patient Brochure
NANOS Patient Brochure Homonymous Hemianopia Copyright 2016. North American Neuro-Ophthalmology Society. All rights reserved. These brochures are produced and made available as is without warranty and
More information7Motion Perception. 7 Motion Perception. 7 Computation of Visual Motion. Chapter 7
7Motion Perception Chapter 7 7 Motion Perception Computation of Visual Motion Eye Movements Using Motion Information The Man Who Couldn t See Motion 7 Computation of Visual Motion How would you build a
More informationInformation Guide. Synoptophore (Major Amblyoscope) Heading. Body copy. Body copy bold
Information Guide Heading Body copy Body copy bold Synoptophore (Major Amblyoscope) Synoptophore (sin-op-to-phore) Greek: syn = with, ops = eye, phoros = bearing Introduction This information has been
More informationMarco TRS Total Refraction System
Marco TRS-5100 Total Refraction System TRS-5100: Total Refraction System The TRS has a forehead position detector (blue LED) for reliable vertex measurements. Wide Visual Field (40 ) apertures provide
More informationLecture 2: Geometrical Optics. Geometrical Approximation. Lenses. Mirrors. Optical Systems. Images and Pupils. Aberrations.
Lecture 2: Geometrical Optics Outline 1 Geometrical Approximation 2 Lenses 3 Mirrors 4 Optical Systems 5 Images and Pupils 6 Aberrations Christoph U. Keller, Leiden Observatory, keller@strw.leidenuniv.nl
More informationMicromedical VisualEyes 515/525 VisualEyes 515/525
Micromedical VisualEyes 515/525 VisualEyes 515/525 Complete VNG solution for balance assessment Micromedical by Interacoustics Balance testing with VisualEyes 515/525 Videonystagmography provides ideal
More informationGonioscopy Wet-Lab. About Me. About Me Gonioscopy. Indications for Gonioscopy. Billing Gonioscopy 12/13/2012. Code: 92020
About Me Gonioscopy Wet-Lab Marcus Gonzales, OD, FAAO Cedar Springs Eye Clinic (formerly BridgeBuilders Eye Clinic) About Me Gonioscopy Evaluates the anterior chamber angle responsible for the outflow
More informationVisual Effects of Light. Prof. Grega Bizjak, PhD Laboratory of Lighting and Photometry Faculty of Electrical Engineering University of Ljubljana
Visual Effects of Light Prof. Grega Bizjak, PhD Laboratory of Lighting and Photometry Faculty of Electrical Engineering University of Ljubljana Light is life If sun would turn off the life on earth would
More informationReview and Practical Application of Telescope Optics
Review and Practical Application of Telescope Optics William L. Brown, OD, PhD, FAAO Mayo Clinic Rochester, MN brown.william2@mayo.edu Please silence all mobile devices and remove items from chairs so
More informationDr. Magda Rau Eye Clinic Cham, Germany
3 and 6 Months clinical Results after Implantation of OptiVis Diffractive-refractive Multifocal IOL Dr. Magda Rau Eye Clinic Cham, Germany Refractive zone of Progressive power for Far to Intermediate
More information3/6/2014. Because: Answer: Early studies comparing acuity with spectacles vs. scl or rigid cl s
IAO/COS March 7, 2014 Peter Russo, OD, FAAO Professor Department of Ophthalmology Loyola University Medical Center Edward Hines Jr. VAMC No financial disclosures. We don t; we just look better in CL s.
More informationA Three-Channel Model for Generating the Vestibulo-Ocular Reflex in Each Eye
A Three-Channel Model for Generating the Vestibulo-Ocular Reflex in Each Eye LAURENCE R. HARRIS, a KARL A. BEYKIRCH, b AND MICHAEL FETTER c a Department of Psychology, York University, Toronto, Canada
More informationVivid Vision Games and Activities Definitions Rift and Vive (English) For Vivid Vision Clinical v2.73 VIVID VISION, INC
Vivid Vision Games and Activities Definitions Rift and Vive (English) For Vivid Vision Clinical v2.73 2 v1.1 CONTENTS AND COPYRIGHT INDICATION STATEMENT AND PRECAUTIONS...............1 VIDEO TRAINING GUIDE........2
More informationCS 443: Imaging and Multimedia Cameras and Lenses
CS 443: Imaging and Multimedia Cameras and Lenses Spring 2008 Ahmed Elgammal Dept of Computer Science Rutgers University Outlines Cameras and lenses! 1 They are formed by the projection of 3D objects.
More informationThinking About Psychology: The Science of Mind and Behavior 2e. Charles T. Blair-Broeker Randal M. Ernst
Thinking About Psychology: The Science of Mind and Behavior 2e Charles T. Blair-Broeker Randal M. Ernst Sensation and Perception Chapter Module 9 Perception Perception While sensation is the process by
More informationBasic Principles of the Surgical Microscope. by Charles L. Crain
Basic Principles of the Surgical Microscope by Charles L. Crain 2006 Charles L. Crain; All Rights Reserved Table of Contents 1. Basic Definition...3 2. Magnification...3 2.1. Illumination/Magnification...3
More information