A better lens material silicone hydrogel contact lenses
Silicone hydrogel contact lenses are soft lenses which allow oxygen to pass through the lens to the cornea than any other type of lenses. Silicone hydrogel lenses allow oxygen to pass through the cornea five times higher than any other lens materials. They absorb water readily and becomes soft like the gel when soaking in lens solutions. It becomes hard, rigid and deforms when left to dry out. But it will retain its form once soak in the solution.
A common eye condition called hypoxia occurs with millions of contact lens wearers. This is due to reduce the reach of oxygen in the front portion of the eye, causing oxygen deficiency in the cornea. This leads to redness of the eye, blurred vision, corneal swelling and other discomforts to the eye. Also, it can lead to some eye infections. Silicone hydrogel contact lenses were introduced to counter these problems and increase the safety of contact lens wearers.
contact lenses are highly oxygen permeable due to which it can be used to design different lenses with greater lens mass such as Toric lenses, bifocals, and contact lenses for an unusual prescription, hard-to-fit eyes and even lenses for keratoconus.
Silicone hydrogel contact lenses wearers often complain of dry eyes, itchiness and allergy-like symptoms. These symptoms are usually with most contact lens wearers. As silicone hydrogel lenses allow more oxygen to pass through most lens wearers becomes aware of their lenses. Also, the added silicone reduces the wet – ability on the surface of the lenses which makes them harder to remain moist on the eyes. There are newer contact lens solutions which will hydrate the lenses for all-day wearers.
Most soft contact lens wearers feel comfortable because of the reduction in the supply of oxygen leading to reduce the sensitivity of the corneal surface. With the use of silicone hydrogel lenses, there is highly oxygen available for the cornea to maintain its normal sensitivity, which makes most wearers aware of the lenses on their eyes. Studies in FDA, USA and MHRA, UK, have also confirmed that there is no evidence of allergies due to silicone hydrogel contacts.
Silicone hydrogel contact lenses are beneficial for people who wear lenses for longer hours and who choose extended wear lenses. They are little more expensive than most non-silicone lenses. For people with problems adjusting to rigid silicone, lenses can opt for these lenses. Though the advantages are numerous not everyone may be a candidate to use these lenses. A thorough check-up and detailed consultation with your eye doctor can only determine whether they are right for you or not.
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