near vision test

The near vision test is a method for the examination of myopia patients. The measurement results are easier to equip with glasses and protect eyesight. The light source is illuminated on the watch during the inspection, but the reflection should be avoided. Let the subject hold the near vision chart in front of the eyes and move back and forth until you find the smallest number you can see. If you can see the 1st word or 1.0, let it gradually move closer until the writing begins to blur. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Inappropriate people: There is no clear rule unless the eyes are injured. Normal value E-eye chart with both eyes squinting up to 1.0 and above is the emmetropic eye (normal). Clinical significance Abnormal result 1. According to the degree of myopia (1) Within 3.00D (300 degrees), it is called mild myopia. (2) Moderate myopia is 3.00D to 6.00D (300 degrees to 600 degrees). (3) 6.00D (600 degrees) or more for high myopia, also known as pathological myopia. 2. According to the refractive component (1) Axial myopia is caused by excessive development of the anterior and posterior axes of the eyeball. (2) Curvature myopia is caused by excessive curvature of the cornea or crystal surface. (3) Refractive myopia is caused by excessive refractive index of refractive interstitial. 3. False myopia Also known as accommodative myopia. It is caused by the adjustment of the distance when it is not relaxed. It is fundamentally different from true myopia in which the refractive component changes. 4. Mixed myopia Often a person's myopia is caused by eye fatigue caused by pseudomyopia, which leads to the slow synchronization of some true myopia and pseudo myopia. It can be said that in people whose myopia is deepening, they are all mixed myopia. The most effective physical means of myopia is nothing more than two kinds. One is surgery. Because the current surgical situation is still not clear about the sequelae, there is no way to explain the shortcomings. The advantage is that it is effective. Need to check the population of myopia patients, can not see the distance, blurred vision. Precautions Taboo before inspection: squinting. Requirements for inspection: alternating left and right eyes. Inspection process At present, the more common near vision chart in China is the Jaeger near vision chart and the standard eye chart (Xu Guangdi). The former has eight lines of different sizes, each side of which has a number on the side, and the latter is the same as the far vision chart (International Chart of Sight). The light source is illuminated on the watch during the inspection, but the reflection should be avoided. Let the subject hold the near vision chart in front of the eyes and move back and forth until you find the smallest number you can see. If you can see the 1st word or 1.0, let it gradually move closer until the writing begins to blur. The point that can be seen before it is blurred is the near point. The distance between the near point and the cornea is the near point distance, and the recording is in centimeters. Not suitable for the crowd Inappropriate crowd: There is no clear rule unless the eye is injured.