Adaptation to hydrogel contact lenses: variations in myopia and corneal curvature measurements.

Forty patients wearing lenses (soflens) were examined regularly for 3 months. During the first month the mean myopia gradually increased to 0.12 D more myopia and increased linearly to 0.50 D more myopia at 3 months. The mean corneal curvature flattened during the first 3 weeks, but steepened to about 0.37 D at 3 months. The process of myopia changes are not attributed solely to the anterior corneal curvature, but may also be the result of variations in the posterior corneal curvature, corneal thickness and index refraction as well as a change in the depth of the anterior chamber.