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Orbscan measures intraindividual variations in corneal thickness
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In healthy corneas, corneal thickness varied from just over 500 µm centrally to almost 650 µm inferotemporally, according to a study using the Orbscan Topography System II.
The study found that the difference between the minimum paracentral thickness and the maximum paracentral thickness was similar to the difference between the central thickness and the minimum paracentral thickness, according to the authors.
Juan A. Sanchis-Gimeno and colleagues studied the corneal thickness characteristics of 1,000 eyes of 1,000 young, healthy emmetropic subjects between January 2001 and May 2003. Subjects ranged in age from 20 to 30 years old. The researchers measured corneal thickness at seven points: central, nasal, superonasal, inferonasal, temporal, superotemporal and inferotemporal.
In each person, the difference between the central thickness and the maximum paracentral thickness ranged from 85 µm to 107 µm. The difference between the central thickness and the minimum paracentral thickness ranged from 36 µm to 59 µm. The difference between the minimum paracentral thickness and the maximum paracentral corneal thickness ranged from 37 µm to 58 µm.
The study is published in the October issue of Cornea.