Contact lens, also called contact lens, is a kind of lens worn on the cornea of eyeball to correct vision or protect eyes. According to the hardness of materials, they are divided into hard, semi-hard and soft. Contact lenses not only greatly improve the appearance and convenience of patients with myopia, hyperopia and astigmatism.
And the vision is broad and vivid. In addition, it also plays a special role in controlling the development of myopia and astigmatism in adolescents and treating special eye diseases. Generally speaking, the center thickness of low water content lenses is relatively thin, and the center thickness of high water content lenses will be designed to be thicker.
relevant information
For friends who wear contact lenses or colored contact lenses for the first time, they will feel uncomfortable. One of the possible reasons is: corneal hypoxia. Under normal circumstances, our cornea needs to breathe, and the oxygen permeability of contact lenses is an important index to evaluate the quality of contact lens materials, so the high oxygen permeability of lens materials is a very important factor in choosing lenses.
Long-term corneal hypoxia can easily lead to corneal complications, such as chronic corneal edema and corneal neovascularization. Contact lenses, especially colored contact lenses, meet the needs of beauty lovers, but we must fit our contact lens products according to standardized procedures and carry out daily care in strict accordance with nursing procedures.
Especially lenses made of different materials, such as ordinary hydrogel lenses and silicone hydrogel lenses, have great differences in oxygen permeability and wearable time.