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Proceedings Paper

Working sketch of an anatomically and optically equivalent physical model eye
Author(s): Ravi Chandra Bakaraju; Klaus Ehrmann; Darrin Falk; Eric B. Papas; Arthur Ho
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Paper Abstract

Our aim was to fabricate a bench-top physical model eye that closely replicates anatomical and optical properties of the average human eye, and to calibrate and standardize this model to suit normal viewing conditions and subsequently utilize it to understand the optical performance of corrective lens designs; especially multifocal soft contact lenses. Using available normative data on ocular biometrics and Zemax ray-tracing software as a tool, we modeled 25, 45 and 55 year-old average adult human eyes with discrete accommodation levels and pupil sizes. Specifications for the components were established following manufacturing tolerance analyses. The cornea was lathed from an optical material with refractive index of 1.376 @ 589 nm and the crystalline lenses were made of Boston RGP polymers with refractive indices of 1.423 (45 & 55yr) and 1.429 (25yr) @ 589 nm. These two materials served to model the equivalent crystalline lens of the different age-groups. A camera, the acting retina, was hosted on the motor-base having translatory and rotary functions to facilitate the simulation of different states of ametropia and peripheral refraction respectively. We report on the implementation of the first prototype and present some simulations of the optical performance of certain contact lenses with specific levels of ametropia, to demonstrate the potential use of such a physical model eye. On completion of development, calibration and standardization, optical quality assessment and performance predictions of different ophthalmic lenses can be studied in great detail. Optical performance with corrective lenses may be reliably simulated and predicted by customized combined computational and physical models giving insight into the merits and pitfalls of their designs

Paper Details

Date Published: 18 February 2009
PDF: 9 pages
Proc. SPIE 7163, Ophthalmic Technologies XIX, 716316 (18 February 2009); doi: 10.1117/12.808646
Show Author Affiliations
Ravi Chandra Bakaraju, Institute for Eye Research Ltd. (Australia)
Vision Cooperative Research Ctr. (Australia)
Univ. of New South Whales (Australia)
Klaus Ehrmann, Institute for Eye Research Ltd. (Australia)
Vision Cooperative Research Ctr. (Australia)
Univ. of New South Whales (Australia)
Darrin Falk, Institute for Eye Research Ltd. (Australia)
Vision Cooperative Research Ctr. (Australia)
Eric B. Papas, Institute for Eye Research Ltd. (Australia)
Vision Cooperative Research Ctr. (Australia)
Univ. of New South Whales (Australia)
Arthur Ho, Institute for Eye Research Ltd. (Australia)
Vision Cooperative Research Ctr. (Australia)
Univ. of New South Whales (Australia)


Published in SPIE Proceedings Vol. 7163:
Ophthalmic Technologies XIX
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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