4:57 AM
Anurag
Common people have a mindset that weakness of eyes or lack of Vitamin-A are the only causes of specs. Eyes are like a camera. When the axial lengths of eyes are normal then the image of distant things falls at the right place. If the axial lengths of the eyes are 1mm greater than normal then, the person has to put up specs of -6.00D.
Opposite to this if, the axial length of the eyes are 1mm short than normal then the image get formed behind the retina. It can be treated with +6.00D specs. In third type of vision problems the focus of the image falls at two points on retina. It is correctable by putting cylindrical lenses. People think that, if they can see things clearly then they don't need to have any specs.
When the vision problems are in smaller extent then their symptoms are:
- Headache
- Watering of eyes
- Feeling stressed
There are basically three types of vision problems in scientific languages:
- Hyperopia (Long sightedness)
- Myopia (Short Sightedness)
- Astigmatism
Hyperopia (Long sightedness):
Hyperopia or Long Sightedness is the vision problem in which one can see the things located very far but cannot see the things nearby.
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| Image Formation in case of Hyperopia |
How to correct Hyperopia?
It can be corrected by the use of single vision convex lenses. Convex lenses helps correct the hyperopia. The way in which convex lenses works is being shown in the diagram below.
Myopia (Short Sightedness):
Myopia or Short sightedness is the vision problem in which one can see the things nearby but cannot see the things which are far.
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| Image formation in case of Myopia |
How to correct Myopia?
It can be corrected by using concave lenses. Concave lenses help the retina to focus image of the objects at the right place. The actual diagram is given below.
Astigmatism:
Astigmatism is a kind of disease in which both the near and far located objects cannot be seen clearly. It is generally seen in persons greater than 40 years of age.
How to correct Astigmatism?
Astigmatism can be treated using by-focal lenses. It has two lenses combined together. The one of them enhances the nearby sight and the other with the far. It is made such that the patient can see the far located objects by the upper half of the lens and can see the nearby objects with the lower half. Bi-focal lenses are of different types and are given looking to the profession of the patient.
There are various other technologies these days to deal with such problems. Such an effective technology is Lasik Technology which is used to cure different eye problems with the help of laser treatment. You can know more about it on another page. To no more about Lasik Technology and it's uses just click on the Link given below.
Use of Lasik Technology for treatment of Vision disorders
Use of Lasik Technology for treatment of Vision disorders
Posted in: bi-focal lenses,eye diseases,Health,Health Technology,How to correct Hyperopia,Hyperopia,Lasik,lenses,Long sightedness,Myopia,Short Sightedness,specs,to correct Myopia,vision problems
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