I. What is visual acuity In layman’s terms, visual acuity is the ability of the eyes to see things. Visual acuity is divided into distance vision and near vision. The visual acuity checked at a distance of 5 meters from the distance vision table is distance vision, and the visual acuity checked when the eye is 30 cm from the near vision table is near vision. When there is no other problem with the eye, a decrease in distance vision and normal near vision is considered myopia, while a major decrease in both distance and near vision may be farsightedness, astigmatism, amblyopia, or low vision. Further examination is needed. What is myopia? Myopia is mainly manifested as far-sightedness less than 1.0 and near-sightedness greater than 1.0. Commonly speaking, it means that you cannot see things in the distance, but you can see clearly in the near. The distance between the eye and the object that can be seen clearly is the far point of the eye, and the closer the far point, the higher the degree of myopia. The closer the distance, the higher the myopia. Myopia is inherited from parents to their children. 2. Developmental myopia. The front and back axes of the eye are too long – axial myopia. Both malnutrition and heredity can cause this. 3, too much time for close work, such as long-term reading, writing, watching the computer for too long, so that the regulation of long-term tension or even continuous spasm, can not relax, ciliary muscle hypertrophy, crystal thickening and loss of elasticity – refractive myopia. Pseudomyopia and true myopia Pseudomyopia – is due to excessive close work, too long, causing spasm of regulation, through the use of regulatory relaxation drugs (such as tropicamide, etc.), the vision can be restored to normal. The main methods of prevention and treatment are 1, pay attention to eye hygiene, do not look at near objects for a long time, do not lie down. Don’t lie down. Walking. Read a book while riding in a car. 2, distant look, look near 1 time to look into the distance after 5-10 minutes. 3, massage the eyeballs, do eye exercises. 4, playing ping-pong gaze method, so that the eye in the look away and look at the near alternately, such as watching playing ping-pong. 5, the appropriate lighting conditions, in order to see clearly without blinding. True myopia – After ruling out pseudomyopia, those who cannot restore their vision to normal with the use of relaxing medication are called true myopia. The treatment for true myopia is to wear glasses that fit myopia. In order not to affect learning and life. How to find out if your child has myopia. What to do if you have myopia? Watching TV, looking at things, looking close to things, rubbing eyes often. Writing. The child’s eyes are not affected by reading, writing and looking at close objects. This means that the child may have myopia, to go to the regular hospital as soon as possible to check, so that early detection of pseudomyopia to get timely treatment to restore normal vision, if found to be true myopia, in order not to affect the child’s learning and life is best to wear glasses. In this way, when looking at the blackboard. The TV and look at distant objects will be clear, eyes are not tired, myopia development will also be slower.