Optometrists are primarily concerned with examining eyes and performing other services to safeguard and improve vision. To do this, they use special tests and instruments to identify and evaluate eye health, including visual acuity, depth and color perception, and ability to focus and coordinate the eyes. They prescribe what should be done to correct vision problems, which may include prescriptions for eyeglasses, contact lenses, vision therapy, or therapeutic drugs. They diagnose eye diseases caused by systemic conditions such as diabetes or high blood pressure. Optometrists refer these patients to other specialists.

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