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Corneal topographic changes after radial keratotomy.

P J McDonnell¹, J Garbus

¹Doheny Eye Institute, Los Angeles 90033.

|January 1, 1989

Summary

Radial keratotomy flattens the cornea, especially centrally, creating a variable optical zone. These topographical changes after radial keratotomy can explain visual phenomena like improved acuity and ghost images.

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Area of Science:

Ophthalmology
Corneal Surgery
Optometry

Background:

Radial keratotomy (RK) is a refractive surgical procedure to correct myopia.
Understanding the corneal topography changes post-RK is crucial for predicting visual outcomes.

Observation:

A high-resolution photokeratoscope with digital video acquisition was employed.
Anterior corneal topography was analyzed before and after radial keratotomy.

Findings:

Radial keratotomy results in overall corneal flattening, with a more pronounced central effect.
A central "optical zone" of flattening exhibits variability in size, shape, and location post-RK.

Implications:

Regional variations in corneal power after RK may account for better-than-expected visual acuity.
Corneal power irregularities following RK could contribute to the perception of ghost images.

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