To see from a medicinal perspective, contact lenses are worn to correct myopia (nearsightedness), hyperopia (farsightedness) or astigmatism. Besides, there are also contacts available to enhance or change the color of the eye with or without a prescription for visual correction. Theatrical contacts are also available to give the eye an appearance that matches a theatrical costume like a cat or zombie. We can say, contact lenses benefit many style person.
Contact Lens Types
- Soft Lenses: The most commonly prescribed contact lens are these gel-like containing plastics the size of the iris of the eye. More recently, the silicone hydrogel lenses have been introduced and are generally preferred by practitioners since they allow more oxygen to pass between the lens and the eye and are less likely to dry out.
- Hard Lenses: Made from PMMA, which is plexiglass or lucite, these lenses are almost never used anymore but may be preferred or required by the patient.
- GP or RGP Lenses: These are “oxygen permeable” lenses that are stiff, waterless plastics geared toward patients with presbyopia and a high astigmatism and a smaller than the iris of the eye.
Contact Lens Wear
- Daily Wear contacts can be worn throughout the day but must be removed and cleaned nightly. Daily wear contact lenses come in different durations of wear time and must be eventually disposed of and replaced with a fresh pair. There are contacts that are disposed of daily, weekly or monthly depending on the preference as well as the visual needs of the patient.
- Extended Wear contacts can be safely worn overnight or up to 7 consecutive days without removal. Continuous wear lenses are a type of extended wear that can be worn for up to 30 consecutive nights without removal.
There are also contact options available for more severe eye diseases and may need to be custom made to fit and serve the purpose of a special needs situation. Almost anyone these days can wear contacts, in fact 1 out of 5 people in the U.S. is a contact lens wearer. Whether the purpose for contact lens wear is a replacement to glasses or for more aesthetic purposes there is bound to be a healthy contact option available for everyone.
Love at first sight test
Dark Sparkle-Christmas make-up
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Like a lens, cornea is transparent, thin but very important part in eyes. Generally, the functions of iris must be cooperated with the assistance of cornea. There is no blood vessel in cornea. However, oxygen is very critical for cornea. And oxygen can only be sent to cornea by tear film. Many people in nowadays choose to wear contacts for some eye problems. But for these contacts, oxygen can not be let in thoroughly.
It is true that contacts can let oxygen through, but sometimes they can not. If people wear contacts for very long time, on these lenses will be some wastes that can be barriers for oxygen. So people should replace their contacts often. Still, many people love to sleep in their contacts. This is also a very bad for the health of corneas.
While at night, corneas will expand to some extent. However, contacts will worsen this expansion process which can not be compensated correspondingly. Fortunately, the latest contacts that can let through sufficient oxygen will not worsen the expansion. On the contrary, if the corneas can not get sufficient oxygen, some new tissues will appear on them for more oxygen. Such changes are mainly for some essential needs. However, these tissues will cause some problems on the eyes.
If these tissues are minor and do not grow big, they can be neglected. However, if there are amassing amount of these tissues, corneas will suffer a lot. The results will always be blurriness or even blindness. Luckily, there are some methods that can be used to deal with these problems. One should try not to sleep in their contacts. Of course, one can also choose to wear contacts with perfect oxygen permeability. Nowadays, the manufactures of contacts have noticed that there are some defects in their materials, so they spare no efforts to upgrade their products. The latest ones can now be used to eliminate many complications that often occur in the past.
These contacts can let through almost all oxygen that eyes need. It is true that wastes will be left on the lenses after wearing for very long time. But within certain extend, such waste will not impede the permeability of oxygen. Anyway, people are suggested to follow the advices of their eye doctors in selecting contacts, though there are some new products in the market. The latest lenses can seldom lead to the growth of some tissues in the corneas. However, people should often visit their eye doctors if they find any changes in their eyes, even though they wear some latest lenses.
Wearing rigid gas permeable contacts can help avoid such progression. Some eye doctors now tend to recommend some latest contacts. These lenses are made from very special materials and wearers are less likely to suffer from some in-growth-tissues problems in the corneas than they used to be. The eye doctors have the latest information of these lenses. Nowadays, many famous contacts manufactures are engaged in the research and development of such lenses. Astigmatism and presbyopia can be easily treated with their products. Contacts with perfect gas permeability can promise healthy eyes.
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Article Source:http://www.articlesbase.com/vision-articles/how-to-deal-with-ingrowthtissues-in-the-corneas-1683513.html