As the degree of myopia and negative asphericity increased, the corneal radius of curvature decreased. Corneal Q-values less than -0.3 were associated with reduced optical performance of the cornea.

No abstract

* BACKGROUND AND OBJECTIVES: To evaluate corneal topographic changes induced by excision of two pterygia and a perilimbal dermoid. * MATERIAL AND METHODS: Using the EyeSys Corneal Analysis System, we retrospectively analyzed the changes in astigmatism, mean central corneal power, and other topographic parameters of three corneas before and after surgical removal of two pterygia and a perilimbal dermoid. * RESULTS: Marked corneal steepening occurred along the preoperative flat meridian after the excision of the pterygia and dermoid cyst. For each patient, surgery increased the mean central corneal curvature and decreased total astigmatism. * CONCLUSION: Surgical excision can ameliorate abnormal corneal topographic changes produced by limbal lesions. [Ophthalmic Surg Lasers 1999;30:458-464.]

No abstract