What is the point of 250 degree myopia

Many people suffer from myopia due to improper eye protection in daily life, or long-term use of things that are harmful to the eyes, such as electronic products. Once you suffer from myopia, it is difficult to recover, but you can protect your eyes to prevent the degree of myopia from getting worse and causing more serious consequences. Because myopia also has different degrees of severity, and 250 degrees is a mild myopia, what is its scale on the eye chart?

250 degrees is mild myopia and can be completely recovered

Just pay attention to eye hygiene

Correct bad eye habits

1. Using eyes too close:

When looking at nearby objects, in order to make the object accurately imaged on the retina, the circular fibers of the ciliary muscle begin to contract, the suspensory ligaments of the lens relax, and the lens bulges forward by its own elasticity. The convexity of the lens becomes larger and the refractive power is enhanced. In this way, the scattered light emitted by nearby objects can also form an image on the retina, and the human eye can see nearby objects clearly. The regulatory function of the eye is closely related to age. The older you are, the less accommodative the lens is and the farther your eyes' near point becomes. Prolonged close-range use of the eyes will lead to overuse of the eye's accommodation, and there will not be sufficient residual accommodation power to be used as a backup, which will easily cause eye fatigue and form pseudomyopia. Over time, the anterior-posterior diameter of the eyeball will lengthen, forming true myopia, severe vision impairment, and some people may even develop into high myopia. Long-term close-range eye use is the main cause of myopia among students.

Educate children to maintain correct posture, with their heads and necks upright, their bodies upright, and their eyes at right angles to the plane of the book. Pay attention to three distances: one foot, one fist, and one inch. That is, when reading and writing, the distance between your eyes and the book should be kept at more than one foot; the distance between your body and the desk should be kept at a fist; when holding a pen, the distance between your hand and the tip of the pen should be kept at one inch.

2. Continuous use of eyes for a long time:

The academic burden is too heavy, and in order to complete the large amount of homework, I have to read and write for hours without rest. Using the eyes continuously for a long time like this puts too much strain on the eyes' vision. Without time to relax and rest, the internal and external eye muscles remain tense, poor circulation and increased intraocular pressure cause spasms and gradually form myopia.

3. Reading while walking or riding:

When walking, the hands will often shake, and when riding in a car, the car will shake from time to time. The distance between the book and the eyes will constantly change. The target that the two eyes are looking at moves many times, and the visual center receives a blurred image. If you want to see the font on the book clearly, you have to hold the book close to your eyes. In a myopic environment, you must constantly change the adjustment strength of your eyes in order to see the font clearly. Continuous tension in the intraocular muscles can easily cause visual fatigue and accommodation spasm.

4. Reading or writing under strong light or sunlight:

Too much or too little light can have adverse effects on the eyes. People control the amount of light entering their eyes by dilating or constricting their pupils. In our daily life, we only need 100-meter candlelight for reading and writing, but when reading in the sun, the illumination can reach 80,000 to 120,000 meter candlelight, which is 800 to 1,000 times the daily illumination. In addition, because the light is too dazzling, after looking at it for a while, you will feel that there are dark shadows everywhere in front of your eyes. This is the afterimage effect caused by the stimulation of strong light on the macular area of ​​the retina. Reading under strong light for a long time will cause over-adjustment of the intraocular muscles and promote the occurrence and development of myopia. Strong light can damage the retina, especially the macular area, reduce visual acuity, and even cause permanent vision loss. Reading under strong sunlight for a long time can easily damage the cornea and lens due to the strong ultraviolet radiation.