Contact Lens: How Does It work?
Do you use color contacts ? Or any one of your relative or known people
using? Vision problems are almost common for every person. Day by day the use
of contact lenses is increasing. From 1991 to till now, contact lens users have
amplified by 4% every year. Many people just started using contact lens instead of glasses.
Contact lenses just work as like the
eyeglasses do. For different types of refractive errors like Myopia, Hyperopia,
Astigmatism contact lens work differently.
Color contacts are made of plastic. Contacts are very much
thinner and almost concealed optical disc. Contacts sit steadily over the
cornea of our eyes. It sticks to the level of the tear liquid which coats the
outward of the eye. Our eyelid has a pressure and contacts remain in place
steadily with the help of this.
As contact lens has a unique shape so
it can move easily in our eyes. As a result, we get a more natural view than
the regular eyeglasses. Contact lenses are smaller and thinner than the
eyeglasses. As, a contact lens sits steadily just over the eyes so the optical
zone might be significantly smaller-sized than regular eyeglasses. Because of
the fact that eyeglasses sit quite a half inch away from our eye, so their
optical zone might be bigger-sized.
In such cases, the whole lens surface
will be the optical zone of a pair of eyeglasses. On the other hand, the
optical zone of a pair of contacts is only a part of the contact. For more
understanding, if you stand in front of a window, you will get a big view of
the outside area. But if you go a step away from the window then you need a
much bigger window to get the exact view.
When contact lenses were first
introduced, that time they were made of hard plastic. Due to this, many persons
feels uncomfortable. Also, this hard plastic did not allow oxygen circulation
to the eye. So, users feel irritation as well.
Presently, all types of contact lenses
are made of soft plastic that can absorb water. These lenses are more flexible
to use and through these lenses, oxygen can easily circulate. Not only that,
disposal contacts are also available now-a-days. When you need to change these
types of contacts you can just throw them away and get a new pair of contacts.
But do not use contact lens while you are sleeping. This is highly prohibited.
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