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

2. The result of keratometer was different from that of topography.

3. Conclusions The corneal diopter measured by the topographer was more accurate than that measured by the keratometer, especially for the patients cornea was too steep, flat or corneal opacity.

4. Objective To evaluate the clinical value of combined optometry of auto refract keratometer and phoroptor.

5. Conclusion The hand-held auto photokeratometer is similar to manual keratometer in clinical value, and can be used in measuring corneal diopter.