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Contact lens type material
Hard contact lenses (RGP), soft contact lenses and breathable glasses.
rigid contact lenses are generally made of PMMA polymer, and rigid gas-permeable (RGP) contact lenses are relatively popular.
Soft contact lenses, invented in 1960 by Czechoslovak chemist Otto Wichterle, have become the most popular type of lens because of their comfort.
Breathable glasses use hydrophilic materials to allow oxygen to enter the cornea through the lens, making wearing more comfortable.
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1. Daily wear, the wearer wears the lens without sleep and with eyes open, usually for 12 hours a day.
2. Elastic wear refers to napping with lenses or occasionally sleeping overnight with lenses, not more than 2 nights a week (discontinuous).
3. Long wear, the wearer is still wearing the lens in the sleep state, and the lens is removed for several days.
4. Night wear contact lenses refers to wearing a lens when you sleep at night and taking it off when you get up in the morning. These night wear rigid contact lenses are also called orthokeratology lenses.
Experts pointed out that according to the way of wearing, it can be divided into long wear type and day wear type, night wear type, according to the length of the lens use cycle, it can be divided into abandoned type, regular replacement type, traditional type.
The first wearer can increase the time according to 4h, 6h, 8h, and the time can be extended after slowly adapting.

November 30, 2024