Abstract
OBJECTIVE: To study the corneal stability after radial keratotomy. STUDY DESIGN: Measurement of corneal topography after intraocular pressure (IOP) increase up to 40 mmHg to demonstrate the instability of corneas after radial keratotomy. SETTING: Department of Ophthalmology, University of Hamburg, Germany. PATIENTS: Thirty patients after radial keratotomy, ten emmetropic, ten myopic and ten hyperopic subjects as control group. MAIN OUTCOME MEASURES: A 180° tilting table was used to increase intraocular pressure (IOP). A TMS photokeratoscope was used to measure corneal topography before and after pressure increase. RESULTS: Owing to the rapid IOP increase, each image of normal subjects showed a peripheral and central steepening of the corneal curvature during tilting. A peripheral steepening and a central flattening of the corneal curvature could be demonstrated in each patient after radial keratotomy. CONCLUSION: A weakened cornea after radial keratotomy is exposed to a permanent stretching stress. This stress in a tissue with weak stability and prolonged wound healing causes a permanent progressive hyperopia.
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