Refraction is a process your eye care professional uses to measure your refractive error, or vision problem.
What Is a Refractive Error? A refractive error is an optical defect that does not allow light to be brought into sharp focus on your retina, resulting in blurred or distorted vision. Examples of refractive error are myopia, hyperopia, and astigmatism. What Does a Comprehensive Eye Exam Include? During a comprehensive eye examination, your doctor uses refraction to determine how much power is needed to bring your eyes to normal, perfectly focused vision. Your doctor will decide if glasses, contact lenses or laser vision correction will yield you the most clear eyesight. Refraction consists of two parts, objective and subjective. Objective Refraction An objective refraction is a refraction obtained without receiving any feedback from the patient. An objective refraction is obtained by using different instruments. Your doctor will use a retinoscope or auto-refractor to measure your refraction without asking for subjective responses from you.
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