Optic disk size correlated with refractive error - 18/08/11
Résumé |
Purpose |
To evaluate for which range of refractive error the optic disk size depends on, or is independent of, the refractive error.
Design |
Clinical observational study.
Methods |
The study included 1999 eyes of 1011 subjects with a mean refractive error of −0.97 ± 2.72 diopters (range, −24.25 to +9.4 diopters). Optic disk photographs were morphometrically evaluated.
Results |
The relation between optic disk area and refractive error showed a curvilinear shape, with a steep increase toward high myopia starting at −8 diopters, and a decrease toward high hyperopia starting at +4 diopters.
Conclusion |
The optic disk size depends on the refractive error with an increase in highly myopic eyes beyond −8 diopters and a decrease in highly hyperopic eyes beyond +4 diopters. Confirming histomorphometric studies, the limits of −8 diopters and +4 diopters may be discussed to refine the definitions of high hyperopia and high myopia.
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Vol 139 - N° 2
P. 346-348 - février 2005 Retour au numéro
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