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SPECTACLE
Spectacles are the oldest method
of treating short sight. It is probably the easiest way to
over come short sight. It is not with out disadvantages or
dangers. To many, wearing spectacles is a stigma. Others find
it difficult to wear them. If involved in an accident, the
glasses can break and pierce the eyeball and cause
complications. Of course, chances are very remote.
Fitting right lenses on a suitable frame for a person needs a
lot of knowledge of refraction. Spectacles, when fitted under
the direct supervision of a doctor, will get you the perfect
match.
Contact Lenses
Contact Lenses are another way of treating short
sight. Small plastic lenses are fitted over the cornea in
between the eyelids by the myopic person. These lenses are
only 10 mm to 14 mm in diameter. These lenses cannot be easily
seen by another person. The natural look of the person is
preserved with contact lenses. The contact lenses have to be
worn in the morning and removed in the evening. The lenses
have to be cleaned and stored in a special solution. There are
some extended wear contact lenses available, which are
intended to be worn for a week continuously. But these lenses
have so much of complications that they are not recommended
anymore.
The contact lenses are difficult to be handled by an elderly
person. These lenses if not cleaned properly, will collect
dirt and cause infection to the cornea. Corneal infections can
cause reduced vision. Allergy is another common cause of
irritation for contact lens wearers. Generally it is well
tolerated by young individuals who care for their good looks.
Mainly there are four types of contact lenses available:
1. Soft.
2. Semi-soft (Rigid Gas-permeable Lenses).
3. Coloured Contact Lenses.
4. Disposable Contact Lenses.
Soft lenses are very thin and bends like a plastic paper. They
are very comfortable to wear and patients get used to the
lenses in no time. Unlike the semi-soft lenses they do not
fall off the eyes very easily. But being very thin, they tend
to tear if not handled carefully. The average life of soft
contact lens is about two years.
Semi soft lenses {rigid gas-permeable lenses (RGP)} are
thicker and as the name suggests, are rigid. They are not as
comfortable to wear as the soft lenses. These lenses tend to
fly off the eyes in windy weather. The life of a semi-soft
contact lens is longer than that of a soft lens.
Coloured contact lenses are soft lenses available with
different powers and colours. When worn the eyes become blue,
green, brown, red, etc. depending on the colour of the lens.
They are expensive but are great to give special effects on to
the eye.
Disposable contact lenses are the most hygienic contact lenses
to use. These lenses are replaced every month with new lenses
so that there is hardly any dirt build up on the lens. By the
time dirt starts building up they are disposed off and are
replaced with fresh pair of contact lenses. These lenses are
ideal for people who don't have enough time to clean their
contact lenses. | |
