What is the purpose of a keratometer?

The primary purpose of a keratometer is to measure the curvature of the cornea. This device is essential in assessing the shape and refractive characteristics of the cornea, which is crucial for various ophthalmic evaluations and procedures. The curvature measurements obtained from a keratometer are particularly important in the fitting of contact lenses, diagnosing conditions like astigmatism, and planning for refractive surgeries, such as LASIK.

In contrast to the other options, the evaluations performed by the keratometer specifically focus on the front surface of the eye, rather than examining internal structures (like the retina), assessing eye movement, or measuring intraocular pressure, which requires different specialized instruments. This makes the keratometer unique in its capability to provide precise data crucial in understanding an individual's corneal profile and visual needs.