Keratotorus

In contrast to keratoconus, which can be regarded as an irregular deformity, there is keratotorus in which there is regular increase in curvature over a limited area of the cornea.

The effect of such a peripheral ectasia may be the development of irregular astigmatism, although in this case it would result from keratotorus which is an inverse form of keratoconus.

There is some consensus that keratoconus, keratotorus, keratoglobus, and pellucid zone degeneration are related because these different conditions have been found to coexist in families.