Contact lenses hit become a long way since the period when they were prefabricated of non semipermeable materials like render or hornlike plastics. One consort has been a directive innovator in this industry. The Acuvue Oasys 2 contacts are one of their latest and greatest newborn products.
The first contacts developed did not earmark any gas at every to transfer through. The cornea is a tissue lacking any murder vessels. It receives nutrients by way of diffusion from tear changeful right the receptor and the aqueous nutriment inside as well as finished neurotrophins delivered finished cheek fibers.
The exclusive effectuation of getting gas to the cornea is finished contact with air in the atmosphere. Wearing lenses, that do not earmark this air to transfer through, directly on the eye, limits the acquirable gas considerably. Oxygen is then exclusive supplied to finished tears, which are delivered beneath the lense by incessant blinking. Once insufficient blooming to distribute the tears occurs, the cornea begins to be gas starved, painful, and yet experience tissue death.
During the 1960s soft plastics called hydrogels were developed. These earmark gas to transfer finished the lense cod in part to their high liquid content, adding greatly to the comfort level and country of lenses. As a trade off, the high liquid noesis necessitated that the lense be thicker for durability. Later improvements occurred with the launching of silicone hydrogel. This touchable allows 98% of acquirable gas to transfer through. It is also more durable, allowing for thinner lenses.
Another bourgeois that crapper change porousness is organic build up on the lense surface. This crapper be impaired by meticulous cleaning. This difficulty was addressed by Acuvue's launching of disposables. Changing to firm lenses daily, or biweekly with extended wear, does not earmark the build up to change permeability.
Besides breathability, another comfort factors are wetability and smoothness. Wetting agents were practical to the lenses, in storage, to ready them moist and uncreased during use. The difficulty was that the longer they are worn, the inferior urination agent remained. Acuvue's Hydraclear Plus profession solved this problem. The urination agent is now permanently embedded, sanctioning the lense to reassert both wetness and smoothness.
Extended dress is another innovation. This allows the lenses to be attrited for digit weeks before disposed of, if removed and cleaned daily. Alternatively they may be attrited continuously for up to 6 nights, before replacing with a firm pair. Many users want the convenience of existence free from act glasses at all, or of rousing from rest and existence able to see clearly immediately.
The newborn lenses also substance UV protection. They absorb up to 96% of UVA and UVB. High levels of UV rays crapper drive discolour of the cornea. Some experts also conceive blocking these rays will help prevent cataracts from forming in the cornea.
The Acuvue Oasys 2 contacts are one of the latest examples of profession improvements in lenses. This latest development makes lenses so comfortable that the wearer almost crapper not tell he is act them.
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