An ophthalmometer is also known as a?

The term "ophthalmometer" refers specifically to a device used to measure the curvature of the cornea, which is essential for understanding a patient's refractive status and planning for contact lens fitting or surgical interventions. The correct answer, keratometer, is a synonym for ophthalmometer, as both instruments perform the same fundamental function—measuring the corneal curvature.

In this context, the keratometer uses various methods, such as a projection of mires onto the cornea, to assess both the anterior surface's curvature and, indirectly, the posterior aspect by understanding the overall shape of the cornea. The accuracy of these measurements is crucial for creating corrective lenses and planning surgical procedures like LASIK or cataract surgery.

Other instruments mentioned serve different purposes. A tonometer measures intraocular pressure to assess for glaucoma, a specular microscope evaluates the cellular makeup of the cornea, and an ophthalmoscope allows a clinician to view the interior of the eye, including the retina and optic nerve. Understanding the specific roles of these instruments clarifies why the keratometer is the correct answer for the designation of an ophthalmometer.