1, Keratometry - A keratometer is the primary instrument used to measure the curvature of the cornea.

2, The exact measurement of keratometry and anterior chamber depth are of major importance for the implantation of intraocular lens(IOL)in refractive surgery and the research of refractive errors.

3, ObjectiveTo observe the changes of visual acuity, keratometry values and corneal endothelial cells after deep lamellar keratoplasty or penetrating keratoplasty in keratoconus.

4, All patients were refracted and examined with keratometry preoperatively, 1 week, 1. month, 2 months and 3 months postoperatively.

5, Object To study the shape feature of the children′s corneal surface emmetropia with keratometry and corneal topography.

6, ABSRTACT : Object to study the shape feature of the children′s corneal surface emmetropia with keratometry and corneal topography.