Many people feel blurred by looking at food in the distance to determine myopia. In fact, myopia has true myopia and pseudo myopia, so myopic patients must also determine the severity of myopia before buying glasses. So, from which aspects should we judge whether my eyes are short-sighted, and how to judge my short-sightedness?
1, simple discrimination
You can use a visual acuity chart for visual acuity testing, and then wear a 300-degree telescope to observe the distance. After about 30 minutes, remove the glasses and check with the eye chart. If vision is enhanced, it may be false myopia.
2. Ciliary muscle paralysis method
Ciliary muscle paralysis is the most commonly used in hospitals . Doctors usually use drugs to relax the patient’s ciliary muscles, then leave the eyes in a static refractive state, and then do a visual inspection.
3. Cloud fog method
When using the cloud method to check vision , doctors usually place the patient on a + 3.0D spherical mirror After 3 minutes, the glasses were removed, and the eyesight was checked. If the increase in vision is false myopia, otherwise it is true myopia.
The way to prevent myopia is to avoid excessive use of eyes at close range and develop good eye habits, especially when reading and writing, the distance between books and eyes should be maintained at 35 cm, and rest every 40 minutes Once, rest for 10 minutes. Avoid premature contact with electronic products, etc., to ensure adequate outdoor sports, it is best to exercise more than 14 hours a week.