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By default, topics are displayed for the last 45 days. Institution Department of Ophthalmology, University of Texas Health Science Center, San Antonio. These corneal topography changes suggest that the imaging properties of the cornea should vary with the area of the cornea allowed to participate in image formation. To test this hypothesis visual acuities were measured both through a central and an annular pupil for normals and RK patients as a function of time after surgery. Annular acuities were decreased significantly after RK and remained decreased over time.