pseudomyopia
Introduction
Introduction Adolescents, children reading or writing with eyes not paying attention or lack of illumination and other factors, so that the ciliary muscles are often in a state of constant tension, resulting in ciliary tendon, regulating function decline, the convex lens after the stronger flexion, its The focus no longer falls on the retina, but falls in front of the retina, causing the things to be blurred; if the ciliary muscles are released, the lens can be restored and flattened, and the image can be clearly formed on the retina. It is called pseudomyopia.
Cause
Cause
1. Unscientific use of the eyes for a long time: the distance between the eyes and the book or the word is usually within 33 cm when the child or adolescent is reading or writing. The angle of view is not 90 degrees from the desktop (or written) or reading while lying down. Causes false myopia. In addition, the use of the eyes for a long time without paying attention to rest or learning light when lighting is not good can also cause false myopia.
2, lack of eye nutrition: many children and adolescents have picky eaters, partial eclipse problems, not often eat vegetables, fruits, soy products and coarse grains and other foods, this habit can lead to the lack of vitamin A, vitamin B1, vitamin B12, Vitamin C, vitamin E and vitamin D as well as chromium, calcium, zinc and other elements, which are prone to pseudo-myopia.
3. Excessive stimulation by light color: Children and adolescents often go to the entertainment halls such as the game halls, dance halls, or the Internet for a long time, which will cause the eyes to be stimulated by the light and color of these places, and thus susceptible to pseudomyopia. . Treatment of ametropic amblyopia is not timely: some children or adolescents with ametropic amblyopia may also be triggered if not treated promptly.
4, pseudo-myopia is generally due to long-term close-range work, with poor eye posture, lying on the table, lying in bed or in the unstable car reading, the light is too strong and too weak, so that the eye ciliary muscle is often in tension Fatigue, causing vision loss.
5, people with false myopia are mostly unsightly eyes, especially the primary and secondary school students are more prominent, their vision drops rapidly in a month or even a few weeks, if in the early treatment, pay attention to maintenance, do not need to wear Eyesight can be restored. Pseudo myopia is only an abnormality in the regulation of the eyeball. This change is reversible. Correcting the habit of using the eye in time, and then coping with the treatment of relieving eye muscle fatigue, the vision can be fully recovered. Mixed myopia, which accounts for the vast majority of teenage myopia, is in the process of evolving from functional abnormalities to structural abnormalities. The process of deepening myopia is the process of transforming false components into true myopia in mixed myopia.
Examine
an examination
Related inspection
Vision near vision test
Cloud method
Let the patient wear a +3.0D spherical mirror at the same time, watch the distant object for 3 minutes, then remove the right lens, and immediately check the naked eye vision. The visual acuity is false, and the non-progressive is true; then the left eye is examined by the same method. This method is not very accurate.
Dynamic retinoscopy
1 Check the distance between the eyes and the naked eye. Eye diseases with poor distance vision, normal near vision and no other visual acuity are identified.
2 The dark room doctor and the patient sit facing each other.
3 The patient wears the trial frame and puts a +2.25D spherical mirror in front of the left and right eyes.
4 The patient's eyes simultaneously look at the optotype on the retinoscopy mirror (the 5th word on the side of the mirror or the words with small strokes such as large, small, upper and lower, etc., illuminated by the slit mirror light).
5 for 33cm distance homotopic dynamic retinoscopy.
The result is judged:
1 The eye is in each side of the radial direction is true myopia.
2 Each radial direction is moving or not moving, or one radial movement, and the other radial motion is for front or far vision. Because of its manifestation of myopia, it is pseudo-myopia.
3 is a reverse direction of the radial direction, and the other radial direction is a mixed astigmatism.
Diagnosis
Differential diagnosis
To identify true and false myopia, in addition to hospital optometry, a simple method to hang an international standard eye chart at 5 meters, first determine the vision, and then wear a 300-degree reading glasses, look into the distance, the eyes will slowly appear Cloudy scene, after half an hour to remove the glasses, and then check the vision, such as increased vision, can be considered pseudo-myopia, such as vision still or vice versa, you can follow this method once a day, for three consecutive days, such as vision If there is still no improvement, it can be determined as true myopia.
