The cornea is the most significant refractive structure of the eye, contributing two-thirds of the eye’s refractive power, the remainder coming from the crystalline lens. Normal values for corneal diameters in adults have means ± SD of 11.71 ± 0.42mm horizontally and 10.63 ± 0.63mm vertically, while normal values for anterior corneal curvature and central corneal thickness range from 38.9 to 47.8 diopters (7.06 to 8.66mm) and 490 to 620µm respectively. These corneal parameters tend to vary with age, gender and ethnicity.
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