What measures the dioptric power of the cornea?

Keratometry measures the dioptric power of the cornea by assessing its curvature. This instrument evaluates the shape of the cornea, which is critical for determining how light is refracted as it enters the eye. The cornea is responsible for a significant amount of the eye's total refractive power, so understanding its curvature directly correlates with its dioptric power.

Tonometry is primarily used to measure intraocular pressure, while ophthalmoscopy allows for examination of the interior of the eye, focusing on the retina. Refraction tests are aimed at determining the correct prescription for glasses or contact lenses, focusing on the overall path light takes through the entire optical system of the eye rather than specifically measuring the cornea's power.