Your complete visual field is the entire area seen when your gaze is fixed in one direction. These tests are used to check for gaps in your side (peripheral) vision. But it will also be done if the results of the other visual acuity tests show that your eyesight is below normal and can be corrected by glasses. Refraction is done as a routine part of an eye examination for people who already wear glasses or contact lenses. Refractive errors, such as nearsightedness or farsightedness, occur when light rays entering the eye can't focus exactly on the nerve layer ( retina) at the back of the eye. This test shows your level of refractive error and finds out the right prescription for glasses or contact lenses. Several types of visual acuity tests may be used. And then both eyes may be tested together, with and without corrective lenses (if you wear them). The tests usually involve reading letters or looking at symbols of different sizes on an eye chart. They measure the eye's ability to see details at near and far distances. These tests help your doctor find out if you have a problem that affects how well you can see. Here are some common tests that check for blurred or low vision. Vision tests are usually done along with examinations and tests that check the health of the eye. Others may check how sensitive you are to glare (brightness acuity), how well your eyes work together to provide depth perception, and more. Some of the tests measure your ability to see details at near and far distances, check for gaps or defects in your field of vision, and evaluate your ability to see different colours. Vision tests check many different functions of the eye.
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