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Be prepared to provide any background or medical history (such as any previous injury to the eye, history of treatments or medications used, any signs of vision problems, and vaccination history) that might help with the diagnosis of any eye problem. The first step of the examination involves checking to be sure that the shape and outline of the eyes are normal and that there are no obvious abnormalities. Then, using light and magnification in a darkened room, the reflexes of the pupils and the front part of the eye are examined. Depending on these findings and the reasons for the checkup, additional tests may be needed. Some parts of the examination may require sedation or anesthesia. A test, called the Schirmer tear test, may be performed to ensure that the eyes are producing enough tears to keep them moist. This is a relatively simple test in which a small paper strip is inserted under the eyelid to measure the amount of moisture produced. Another common test involves placing a small drop of fluorescein stain into each eye, which allows defects—such as scratches in the cornea of the eye—to be detected. Pressure within the eye is measured painlessly using an instrument called a tonometer. If eye pressure is too high, optic nerve damage can occur, leading to irreversible blindness. A swab may also be done to culture for bacteria or fungi.
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