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Rigid gas permeable contact lens fitting after radial keratotomy
1Department of Ophthalmology, Tulane University School of Medicine, New Orleans, Louisiana 70112, USA.
Purpose:
The purpose of our study was to determine whether radial keratotomy (RK) patients could be fit with rigid gas permeable (RGP) contact lenses based on postoperative keratometry measurements.
Methods:
Thirteen eyes from eight post-RK patients were fit with RGP lenses for residual refractive errors. Since these patients were self-referred and were operated on elsewhere, preoperative keratometry readings were not available. We used postoperative keratometry readings for base curve selection; and spherical polymethylmethacrylate diagnostic lenses were used for fitting.
Results:
Visual improvements averaged 3.85 Snellen lines (range: 1-8 lines). Prefitting visual acuities were: 20/30 (5 eyes); 20/40 (1 eye); 20/ 50 (1 eye); 20/60 (1 eye); 20/70 (3 eyes); 20/150 (1 eye); and 20/200 (1 eye). Final visual acuities were 20/20 (7 eyes), 20/25 (4 eyes), 20/30 (1 eye), and 20/40 (1 eye).
Conclusion:
We found that when fitting post-RK eyes with RGP contact lenses preoperative keratometry was unnecessary, and an empirical fitting method based on postoperative keratometry was successful.