What does "refraction" refer to in optometry?

Refraction in optometry specifically refers to the process of determining the eye's optical power required to achieve clear vision. This involves measuring how light is bent as it passes through the cornea and lens of the eye, which is critical in identifying the proper corrective lens prescription for patients. The measurement is typically carried out using various methods, such as using a phoropter or automated refractors.

This process is essential for individuals with refractive errors, such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism, as it helps to determine the correct lens power to enhance visual clarity. Understanding the principles of refraction is fundamental in providing the appropriate corrective eyewear and ensuring optimal visual health.

Other options, while relevant to different aspects of eye health and vision care, do not specifically define refraction. For instance, measuring intraocular pressure is important for glaucoma assessment, assessing eye alignment relates to strabismus evaluation, and evaluating eye muscle strength deals with the function of the ocular muscles, all of which are distinct from the process of measuring the refractive error of the eyes.