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ON THE OPTICAL MEASUREMENT OF CORNEAL THICKNESS
Author(s) -
OLSEN THOMAS,
NIELSEN CARSTEN,
EHLERS NIELS
Publication year - 1980
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1980.tb06689.x
Subject(s) - cornea , radius , refractive index , optics , ophthalmology , mathematics , simple (philosophy) , materials science , physics , medicine , computer science , computer security , philosophy , epistemology
The optical principle for the estimation of corneal thickness with a commonly employed method is considered. The theoretical relationship between the apparent and true corneal thickness is described in a simple manner. Based on the theoretical results it could be confirmed that physiological variations in refractive index and radius of the cornea induce an insignificant error in the corneal thickness estimate. The theoretical relationship between apparent and true corneal thickness was compared to the performance of two commercially available pachometers (Haag‐Streit and Zeiss). The actual reading of the pachometers was found to be lower than the theoretical reading by a non‐linear error amounting to about 0.010 and 0.100 mm at a true corneal thickness of 0.50 and 1.00 mm, respectively.