Contact Lens More Information

Contact lenses, also called contact lenses, are lenses worn on the cornea of the eyeball to correct vision or protect the eyes. According to the hardness of the material, it includes three types: hard, semi-hard, and soft. Contact lenses not only bring great improvements to patients with refractive errors such as myopia, hyperopia, and astigmatism in terms of appearance and convenience. Moreover, it has a wide field of vision and lifelike vision. In addition, it has a special effect in controlling the development of myopia and astigmatism in adolescents, and treating special eye diseases.
Material
Silicone hydrogels, hydrated polymers (methyl methacrylate, hydroxyethyl methacrylate, glycerol methacrylate, etc.).

Center thickness
Generally speaking, the center thickness of low-water-containing lenses is relatively thin, and the center thickness of high-water-containing lenses is designed to be thicker.

Oxygen Permeability Coefficient

It is related to lens material, lens moisture content and lens design.

Diameter
13.5mm-14.5mm (This is the most common contact lens diameter range. Some brands of colored contact lenses may exceed this range in order to be beautiful, but they should be used properly in consideration of actual use.)

Optical zone

Refers to the central area of the lens through which external light enters the pupil, and the refractive power of the lens acts on this part.

Lens color

Generally transparent lenses are freshwater blue, and there are also colorless or colored contact lenses.

Base arc

Generally, the base curve of the soft lens should be 0.6-0.8mm larger than the curvature of the front surface of the cornea.

Water content
The level of water content will affect the characteristics of the lens. The higher the water content, the softer the lens, but it is also easier to deform and break, and the lens is more likely to lose water; on the contrary, the lower the water content, the better the moldability of the lens, the smaller the degree of deformation, and the less likely to be dehydrated compared to the high-water content lens. Case. The level of water content is generally divided as follows:

That is: a water content of less than 38% is called a low water content lens, 42%-60% is a medium water content lens, and a water content greater than 60% is called a high water content lens.

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