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Central and peripheral corneal thickness in keratoconus and normal patient groups
1College of Optometry, Ohio State University, Columbus.
Summary
Keratoconus patients show thinner central corneal thickness (CCT) and a greater peripheral-to-central difference (PCT-CCT) compared to normal eyes. These measurements using ultrasonic pachometry are reliable for diagnosing corneal conditions.
Area of Science:
- Ophthalmology
- Corneal Physiology
- Medical Diagnostics
Background:
- Keratoconus is a progressive thinning disorder of the cornea.
- Accurate corneal thickness measurements are crucial for diagnosis and management.
- Understanding variations in corneal thickness between normal and keratoconic eyes is essential.
Purpose of the Study:
- To compare central and peripheral corneal thickness in patients with and without keratoconus.
- To evaluate the diagnostic potential of peripheral-to-central corneal thickness differences (PCT-CCT).
Main Methods:
- Ultrasonic pachometry was used to measure central corneal thickness (CCT) and peripheral corneal thickness (PCT).
- Measurements were taken in 28 normal eyes (14 patients) and 28 keratoconic eyes (14 patients).
- Diurnal and day-to-day variations in CCT were assessed in the normal group to confirm repeatability.
Main Results:
- Mean CCT was 0.56 +/- 0.02 mm in normal eyes and 0.52 +/- 0.04 mm in keratoconic eyes.
- Mean PCT-CCT was 0.24 mm in normal eyes and 0.29 mm in keratoconic eyes.
- Keratoconic right eyes showed significantly different CCT and PCT-CCT compared to normal eyes (p = 0.01).
Conclusions:
- Keratoconic corneas exhibit reduced central thickness and an increased peripheral-to-central thickness gradient.
- Ultrasonic pachometry provides reliable and repeatable corneal thickness measurements.
- PCT-CCT is a significant indicator differentiating keratoconic from normal eyes.