What is a dioptometer?

A dioptometer is an optical instrument used to measure the refractive power of the eye, typically in terms of diopters. It helps assess vision by determining how well the eye focuses light and can aid in diagnosing vision problems. Dioptometers are often utilized in optometry and ophthalmology to prescribe corrective lenses. The device usually involves a series of lenses and a measurement scale to quantify refractive errors.