Contact lenses with water and oxygen channel

Abstract

The invention discloses a pair of contact lenses with a water and oxygen channel. An inwards recessed tear channel with the width of 0.5-1.0mm is formed in the inner surface of the periphery of an optical region in the center of each lens; and small vent holes with the diameters of 0.5-1.5mm are formed in the tear channel. The pair of the contact lenses has the advantages that the small vent holes and the tear channel are combined to form a micro tear circulation system, so that the oxygen permeation and flexibility of the lens are ensured and the cornea anoxia is relieved; and the oxygen permeability of the lens can reach 15-20 times that of a pair of general hydrogel contact lenses and is 3-5 times that of a silicone hydrogel lens, so that the lens can be worn for continuous 3-5 days.

Description

technical field [0001] The invention belongs to the structural design of a contact lens, and relates to a contact lens with convenient exchange of tears inside and outside. Background technique [0002] Since the advent of hydrogel contact lenses whose main material is HEMA (hydroxyethyl methacrylate) in 1971, it has been used until now. Due to its poor oxygen permeability (generally 8-20DK), it cannot be worn for a long time. The daily wearing time cannot exceed 12 hours, but it has superior wearing comfort and flexibility, and the wearing period can reach one year. The silicone hydrogel contact lenses popular on the market at this stage have greatly improved the oxygen permeability of the lenses (3-7 times that of ordinary hydrogel contact lenses), but the feeling of the eyes is still far from that when not wearing lenses. The main source of oxygen required for corneal metabolism is the oxygen in nature dissolved in tears to supply oxygen to the cornea. After wearing cont...

AI Technical Summary

Problems solved by technology

[0003] The patent application number 200620045278.1 "High Oxygen Permeable Tape Contact Lens" proposes to open holes in the lens to increase the circulation of tears inside and outside the glasses. Such openings do allow the tears in the lens to flow outside, but there is a problem to solve The serious disadvantage of disregarding other influences

The lens of this patent has holes in all areas of the entire lens. As we all know, the central area of ​​the lens is the optical zone, and the refractive index of different substances is different. If holes are opened in the optical zone, it will inevitably affect the refraction effect of the optical zone. The lens causes blurred vision after wearing, and such lenses cannot be put into practical use

Irregular openings will also reduce the toughness of the lens. In addition, even if the openings are only in the non-optical area, the tears will not easily flow back to the inner surface of the lens after flowing out, and the oxygen permeability of the lens will not be greatly improved.

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