What is the main purpose of refraction in optometry?

• A. To assess intraocular pressure
• B. To determine a patient's eyeglass prescription for corrective lenses
• C. To evaluate peripheral vision
• D. To determine eye shape

Answer: (B)

The main purpose of refraction in optometry is to determine a patient's eyeglass prescription for corrective lenses. During a refraction assessment, the optometrist uses a series of lenses to measure how light is focused by the eye. This measurement process identifies refractive errors such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. By calculating the necessary lens power to correct these errors, the practitioner can provide an accurate prescription that enables the patient to achieve clearer vision.

Refraction is a fundamental component of the eye examination process and is essential for anyone who requires corrective lenses. It allows the optometrist to individualize treatment based on each patient’s specific visual needs, ensuring optimal visual acuity and quality of life.