Corneal thickness was determined by ultrasonic pachymetry. Corneal curvature was determined using a keratometer. Eyes with corneal pathology or previous intraocular surgery were excluded.

These devices have excellent accuracy and reproducibility in anterior corneal curvature measurement. Limitations of these systems include the following: data at the central zone have to be ...

can identify minor changes in the cornea's curvature, allowing for early intervention. If keratoconus is not detected, the problem can proceed to severe stages in which the cornea becomes too thin ...