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Normal variations of the posterior corneal surface.
M C Dunne1, J M Royston, D A Barnes
1Department of Vision Sciences, Aston University, Birmingham, UK.
Acta Ophthalmologica
|April 1, 1992
Summary
The rear corneal surface, while influenced by the front, shows greater toricity. Corneal curvature varies with sex, refractive error, and age, impacting intraocular lens calculations.
Area of Science:
- Ophthalmology
- Corneal topography
- Refractive surgery
Background:
- Understanding corneal surface variations is crucial for accurate vision correction.
- The posterior cornea's contribution to total corneal power is significant, especially for intraocular lens (IOL) calculations.
Purpose of the Study:
- To measure and analyze the sphero-cylindrical components of the rear corneal surface in healthy eyes.
- To determine normal variations and influencing factors (sex, age, refractive error) of the posterior cornea.
- To assess the impact of anterior:posterior corneal radius ratio on total corneal power estimation for IOLs.
Main Methods:
- Sphero-cylindrical measurements of the rear corneal surface were obtained from 80 healthy right eyes.
- Statistical analysis was performed to identify variations and correlations.
Main Results:
- The rear corneal surface demonstrated greater toricity compared to the anterior surface.
- Both corneal surfaces were flatter in males than females and in myopes compared to hyperopes.
- Younger eyes tended to be flatter, likely due to a higher prevalence of myopia in younger individuals.
Conclusions:
- The posterior cornea exhibits distinct characteristics and toricity.
- Sex, refractive error, and age are significant factors influencing corneal curvature.
- Accurate assessment of both anterior and posterior corneal surfaces is essential for precise IOL power calculations.