This is not the case in abnormal retinae, such as in a person with glaucoma. This presentation will explore the effect of eye movements on the slope of psychometric functions. Monte Carlo simulation were used along with psychophysics in normal and diseased retinae combined with methods of retinal image stabilization to tease apart the effects of pathology, eye movements, and stimulus location on the slope of psychometric functions. The tear film is the first and most powerful refracting surface of the eye. Therefore, irregularities in the tear film can cause optical aberrations, which decrease the quality of the retinal image and potentially compromise visual function.
Sodium fluorescein is the standard clinical method for evaluating tear film breakup.
Although this technique is used to assess the quality of the tears, it does not allow for quantification of the optical or visual consequences associated with tear film breakup. We have developed two new optical methods to monitor tear film breakup. Retroillumination of the tear film provides a qualitative assessment of optical quality, and Shack-Hartmann wavefront sensing provides a noninvasive, quantitative description of the optical aberrations of the eye. This presentation will discuss the time course and spatial distribution of tear film breakup measured by the traditional fluorescein method, retroillumination, and Shack-Hartmann wavefront sensing. Results indicate that the surgery induced large amounts of positive spherical aberration which regressed slightly during recovery.