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. Hospital experts remind that wearing contact lenses requires a detailed examination at a regular hospital or optician. Choose contact lenses that suit you and pay attention to eye hygiene to avoid causing other eye symptoms. If you feel uncomfortable after wearing it, go to the hospital for examination in time.

Wearing time

⑴ Daily wearing means that the wearer wears the lens without sleeping or opening his eyes, usually one day 12 hours.

(2) Elastic wearing refers to taking a nap with glasses or occasionally wearing glasses for the night, no more than 2 nights a week (discontinuous).

(3) Long wear means that the wearer still wears the lens when sleeping and takes it off for a few days.

(4) Night contact lenses refer to wearing glasses when sleeping at night and taking them off when getting up in the morning. This kind of hard contact lens worn at night is also called orthokeratology.

Experts pointed out that according to the way of wearing, it can be divided into long wearing type, daily wearing type and night wearing type. According to the length of the lens service cycle, it can be divided into three types: disposable type, regular replacement type and traditional type.

The time for the first wearer can be increased by 4 hours, 6 hours and 8 hours, and the time can be extended after slowly adapting.

reference data

Contact lenses. Baidu Encyclopedia [reference time 20 17- 12-24]