What might be the main role of an optometrist?

An optometrist's primary role is to diagnose vision defects and prescribe corrective lenses. This includes conducting thorough eye examinations to assess visual acuity and identify various vision problems, such as nearsightedness, farsightedness, and astigmatism. After diagnosing these issues, optometrists can provide corrective measures, primarily through prescription eyeglasses or contact lenses to improve the patient's vision.

In addition to prescribing corrective lenses, optometrists also play a vital role in monitoring eye health and detecting conditions such as glaucoma, cataracts, and other ocular diseases. They provide important preventative care and education about eye protection and overall eye health, ensuring comprehensive vision care for their patients.

While some optometrists may offer additional services, such as fitting and selling eyeglasses, this is not the main focus of their professional practice. They do not typically perform surgeries or handle more complex medical interventions that are more aligned with the responsibilities of ophthalmologists. Thus, the correct answer reflects the core functions and responsibilities of an optometrist within the healthcare system.