distance vision test

Far vision refers to the ability of the human eye to distinguish the smallest object image, and is the shape sensitivity of the fovea in the fovea. The standard logarithmic visual acuity chart is now available in China. During the examination, the examinee first sees the largest line of markers. If it can be identified, it is from top to bottom, from large to small, and the smaller markers are pointed to the examinee step by step until the smallest one can be clearly identified. One line of tags. If the patient's eyesight is estimated to be good, it does not have to be checked by the largest line of markers, and may start with a smaller line as appropriate. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Inappropriate people: those with inflammation of the eyes. Normal value During the examination, if the subject can only recognize the largest "0.1" line E word notch direction on the watch, the visual acuity is "0.1"; if the "0.2" line E word notch direction can be recognized, the record is "0.2". ;And so on. Those who can recognize the "1.0" line or less are normal vision. Clinical significance Abnormal result If the visual acuity is less than 1.0, a visual inspection of the pinhole should be made, that is, the subject is passed through a black piece with a hole of ~-2 mm, and the visual acuity is checked. If the visual acuity of the pinhole is improved, it indicates that there is a refractive error. Need to check the population for hyperopia patients. Precautions Forbidden before inspection: natural light with uncertain sunlight. Requirements for inspection: alternating left and right eyes. Inspection process (1) The method of correct observation of the eye chart should be explained to the subject before the examination. (2) Check the eyes separately, check the right eye first, then check the left eye. When you take a look, you must cover your eyes with a blindfold. But be careful not to oppress the eye. (3) When inspecting, let the examinee first see the largest line of marks. If it can be identified, from top to bottom, from large to small, the smaller marks will be pointed to the examinee step by step until the detection is clear. The smallest line of markers identified. If the patient's eyesight is estimated to be good, it does not have to be checked by the largest line of markers, and may start with a smaller line as appropriate. Not suitable for the crowd Inappropriate people: those with inflammation of the eyes.

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