High Resolution Ocular Surface OCT to Directly Measure Tear Film Thickness in Human Eyes
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1 High Resolution Ocular Surface OCT to Directly Measure Tear Film Thickness in Human Eyes Rahul Yadav, B.Tech., Kyesung Lee, Ph.D., Jannick Rolland, Ph.D., James Zavislan, Ph.D., James Aquavella, M.D. and Geunyoung Yoon, Ph.D. Advanced Physiological Optics Laboratory Institute of Optics, Flaum Eye Institute,, Rochester, NY
2 Financial Disclosure Grant Support: NIH/NEI 5R01EY014999, NYSTAR/CEIS, RPB, Bausch and Lomb Commercial relationship: Rahul Yadav, None Kyesung Lee, None Jannick Rolland, None James Zavislan, Bausch and Lomb, (Research Funding) James Aquavella, Bausch and Lomb, (Research Funding) Geunyoung Yoon, Bausch and Lomb, (Research Funding)
3 Non-invasive imaging of tear film is important in understanding dry eye 3-5 μm NEI Tear Film Functions Smoothens the corneal surface Protects and cleanses the eye Dry Eye Tear dynamics Tear film thickness profile Tear breakup time Retention time of artificial tears
4 Resolution (mm) Challenges for non-invasive tear imaging OCT 1. Commercial Axial Resolution anterior < 1mm segment FD-OCT systems Theoretical Bioptigen Axial Resolution a RTvue Bandwidth 400nm at 800nm Optopol Copernicus HR Center Wavelength = 800nm 2. Dispersion Bandwidth (nm) 3. Imaging Depth > 1.2mm Spectrometer with high spectral resolution 0.15nm spectral resolution 400nm wavelength range 8mm 1.2mm
5 1. Micrometer axial resolution: Broadband laser supercontinuum source Leukos SM20 0.9mm 400nm
6 2. Dispersion: Free space system Collimator Laser Supercontinuum Scanning Mirror Bandpass Filter Beam splitter Spectrometer Concave Mirror Objective Lens Focusing Lens Linear Grating Sample P = 0.85mW Objective Lens Reference Mirror Line scan CCD Cylindrical Lens Concave Mirror
7 3. Imaging depth : Spectrometer for 400nm bandwidth and spectral resolution 0.15nm Input Modified Czerny Turner Spectrometer Concave Mirror Linear Grating 500G/mm Line Scan CCD 8160 Pixels Cylindrical Lens Concave Mirror
8 Δλ = 0.15nm 3. Imaging depth : Spectrometer performance 980nm 890nm 800nm 710nm 620nm Spectral Resolution 980nm nm 620nm nm Imaging Depth > 1.2mm Lateral Imaging Range > 8mm
9 Signal (db) Measured imaging depth and resolution of ocular surface OCT Measured depth sensitivity Depth sensitivity for 0.15nm spectral resolution mm Axial Distance (mm)
10 6mm Imaging a thin nitrocellulose membrane with tear imaging OCT Membrane thickness : 2mm Refractive Index : 550nm Measured thickness : 2.7mm 35mm
11 0.36mm Tear film imaging on soft contact lens surface with ocular surface OCT Average pre-lens tear thickness 23 µm 1.8 µm OCT scan Pre lens tear film Contact lens Post lens tear film Plastic dome 4mm
12 Tear film thickness profile and its temporal variation on soft contact lens surface Tear thickness (mm) Tear thickness (mm) Lateral distance (mm) Time (s)
13 0.36mm Tear film imaging on cadaver porcine eye with ocular surface OCT 4mm Tear layer Epithelium Stroma
14 Conclusions High resolution anterior segment OCT has been demonstrated for tear imaging Prototype OCT system was used to image tear layer over contact lens and porcine eye indicating its feasibility as an useful instrument in dry eye research
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