NEUROLOGY
SURGERY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Patients are cautioned to avoid squeezing the eye-lids, holding the breath.
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The Amsler grid is a test often used for patients with macular problems, such as macular degeneration.
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Patients are cautioned to avoid squeezing the eye-lids, holding the breath, or performing a Valsalva maneuver, as these may result in abnormally increased IOP.
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Visual acuity is tested for both near (14 inchesaway) and distance (20 feet away) vision and performed on each eye separately with a standardized Snellen chart for distance and a Rosenbaum pocket screener for near vision.
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Detailed explanation-1: -Jan Cannon, MSN, RN, replies: The Snellen eye chart is commonly used to measure visual acuity. It consists of a series of block letters or letters and numbers, which become progressively smaller with each descending line. At one end of each line are two numbers that indicate the visual acuity associated with that line.
Detailed explanation-2: -You will be asked to cover one eye with the palm of your hand, a piece of paper, or a small paddle while you read out loud the smallest line of letters you can see on the chart. Numbers, lines, or pictures are used for people who cannot read, especially children.
Detailed explanation-3: -20/20 vision is considered “normal” vision, meaning you can read at 20 feet a letter that most people should be able to read at 20 feet. If a patient reads the 20/200 line that means they can read at 20 feet the letters that people with “normal” vision can read at 200 feet.