Test Eye Model for Corneal Topographers and Ocular Aberrometers

Abstract

The eye model developed will be used as a common model to test both corneal topographers and ocular aberrometers. There are different types of ophthalmic diagnostic devices to measure different parts of the eye. Corneal topographers measure the front surface and ocular aberrometers measure the aberration of the entire eye in one measurement. The most common means for measuring corneal topography is using Placido ring, which is a form of deflectometry. Shack-Hartmann techniques are widely used for ocular aberrometry. Here, an eye model is developed that enables the performance of both types of devices to be assessed with clinical levels of corneal shape and aberration. The eye model consists of two components, one piece contains a freeform surface to represent the cornea, while the second piece has a compensating freeform which regulates the overall aberration of the eye model. Such a model is useful for calibration of the different diagnostic devices.