Because myopia glasses are concave lenses. Concave lenses make an image that is always smaller than the object, an upright virtual image, and they are mainly used to correct myopia.
A prescription eyeglass is a medical device that corrects vision or protects the eyes and consists of a lens and frame assembly. Wearing eyeglasses provides a clear image of objects, corrects vision, prevents protrusion of the eyeball, prevents amblyopia, and prevents complications caused by high myopia.
Myopia is determined by genetic and environmental factors. If the doctor finds that the child has true myopia, and based on the results of a dilated eye exam, the doctor determines that the child needs glasses to correct his or her vision, then the child should wear myopia glasses. Without glasses, the child's eyes will develop with chronic poor vision and eye strain.
Expanded Information:
Methods for fitting myopic glasses:
1. It's best to choose professional eye hospitals, optometric centers, and other institutions to fit your glasses for the first time. Understand whether the optometry personnel have the qualification of optometrists, glasses products (lenses, frames) with or without a qualified mark, to see whether the dispensing organization of optometry, dispensing equipment is affixed with the national compulsory inspection of qualified mark.
2. Allergic people should choose metal frames carefully. Consumers who are prone to allergies should try not to choose metal frames (especially those made of alloy).
3, special eye disease patients should pay attention to the choice of blue light protective glasses. Ordinary consumers are advised to use blue light protective glasses with caution; patients suffering from age-related macular deformation, macular lentigines, diabetic fundopathy and other special eye diseases should choose blue light protective glasses according to ophthalmologists' recommendations.
4, after removing the glasses, personalized adjustments can be made according to the situation. Consumers should check whether there are any surface defects in the glasses, such as scratches on the frames, scratches on the surface of the lenses, cracks and gaps in the lenses, etc., and whether there are any serious uncomfortable symptoms, such as uneven or deformed floors, etc., after wearing the glasses.
Reference resource sources:
Baidu Encyclopedia - Myopia Glasses
People's Daily Online - How to get glasses please look over!
People's Daily Online - Can my child's myopic glasses still be removed? These ten questions must know