Visual acuity: An optometry doctor measures visual acuity to determine how much vision is impaired. For the test, patient will be asked to read letters on reading boards near and far. Visual acuity is written as a fraction, e.g. B. 20/40. The top number is the standard distance at which the test is conducted (20 feet). The bottom number is the smallest font size you can read at a distance of 20 feet. A person with 20/40 visual acuity would need to be within 20 feet of a letter that should be clearly visible 40 feet away. The "normal" television sharpness is 20/20. Ophthalmologist has other methods of measuring vision for young children or patients who cannot speak or understand the visual acuity test. Refraction: An optometrist can perform a refraction to determine the correct lens power you need to compensate for refractive errors (myopia or hyperopia,).Using an instrument called a phoropter, the doctor places a series of lenses in front of your eyes and uses a handheld, light-enhanced instrument called a Retinoscope to measure how they focus the light. Or the doctor can use a manual or automated instrument that tests the refractive power of the eye without requiring the patient to answer any questions. Alignment and focus tests: Your optometry doctor will need to assess how well your eyes are focusing, moving, and working together. To get a single, clear image of what you see, your eyes must effectively shift focus, move, and work in unison. This test looks for problems that are preventing your eyes from focusing effectively or making it difficult to use both eyes at the same time. Optometrist will use a variety of tests to examine the internal and external structures of your eyes to rule out eye disorders that may contribute to strabismus. This test determines how the eyes respond under normal viewing conditions. Your doctor may use eye drops for patients who are unable to respond verbally or when some of the eyes' focusing power is hidden. The eye drops temporarily prevent the eyes from changing focus during the test. The information obtained from these tests, along with the results of other tests, can help doctor determine if patient have strabismus or not. Once the tests are complete, doctor can discuss treatment options.

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