Abstract: in medicine, contact lenses are called “corneal contact lenses”, because contact lenses are in direct contact with the cornea, even if the lens quality is good and the oxygen permeability is high, it will hinder the eye’s demand for oxygen. Therefore, wearing contact lenses requires strict hygiene requirements.
at present, many primary and middle school students wear contact lenses. However, experts point out that contact lenses are not suitable for primary and middle school students. They are in a vigorous period of growth and development, and the visual axis of the eyeball has not been finalized. If they wear contact lenses prematurely or for a long time, it is easy to produce side effects such as corneal hypoxia and physiological metabolic disorders. If the curvature of the lens does not adapt to the cornea, it will also cause corneal wear, and in severe cases, it will lead to corneal ulcer or perforation. Therefore, unless special needs, primary and secondary school students should wear frame glasses. The health problems caused by
contact lenses are increasing day by day. It is estimated that nearly half of the wearers have corneal inflammation because they ignore the disinfection and cleaning of contact lenses. In medicine, contact lenses are called “corneal contact lenses”, because contact lenses are in direct contact with the cornea, even if the lens is of good quality and high oxygen permeability, it will hinder the eye’s demand for oxygen. Therefore, wearing contact lenses requires strict hygienic requirements.
although many people know this in theory, it is easy to ignore the cleaning of lenses in daily life, either because of haste or because they are afraid of trouble, resulting in bacterial infection of the eyes. Doctors found that many people wear contact lenses for a long time, which is an important factor leading to eye diseases such as bacterial keratitis.
contact lenses are foreign bodies placed on the cornea after all. Each blink of the eye will cause a certain friction between the contact lens and the surface of the eye. At the same time, it covers the surface of the cornea, making it difficult for the cornea to directly absorb oxygen from the air. Therefore, wearing contact lenses for a long time or continuously will keep the cornea in a state of continuous hypoxia, Cause corneal epithelial edema and erosion. If there are bacteria or viruses, it may lead to keratitis and even corneal ulcer.
the degree of contact lens in myopia is slightly lower than that of frame glasses, while in hyperopia it is the opposite. A pair of contact lenses must not be worn forever. The material of the soft lens has adsorption. The dust in the air and the protein in tears will be adsorbed on the lens surface over time. It is recommended that the wearing time should not exceed 10 months.