Contrast sensitivity after penetrating keratoplasty.

Area of Science:

• Ophthalmology
• Visual Science

Background:

• Traditional visual assessment relies solely on Snellen acuity.
• Corneal transplantation (penetrating keratoplasty) aims to restore vision.
• Evaluating visual performance beyond Snellen acuity is crucial for transplant patients.

Purpose of the Study:

• To assess contrast sensitivity function in patients post-corneal transplant.
• To compare contrast sensitivity in graft recipients with age-matched controls.

Main Methods:

• Studied 29 patients with successful corneal grafts and best-corrected visual acuity ≥20/50.
• Utilized computer-generated sinusoidal gratings and a commercial contrast sensitivity chart.
• Compared graft patients to an age-matched control group without ocular disease.

Main Results:

• Corneal transplant patients showed depressed contrast sensitivity curves compared to controls, except at low spatial frequencies.
• Despite comparable Snellen visual acuity, visual performance differs between graft recipients and normal subjects.
• A subset of patients with bilateral disease showed improved contrast sensitivity in grafted eyes versus contralateral diseased eyes.

Conclusions:

• Corneal transplantation improves contrast sensitivity but does not fully restore normal visual function.
• Non-acuity visual parameters are important for assessing real-world visual function in corneal transplant patients.
• The clinical utility of contrast sensitivity testing in corneal transplant recipients requires further definition.