If your eye doctor tells you
that you have “Cataract” (motiya) in your eyes, immediately you’ll get
scared. But I have a good news for you! Actually cataract is not a disease,
but it is an opacification of the lens of our eye that affects vision. For
example, like a camera lens, when camera lens becomes dirty or blurred by
any reason then photo cannot come clear. Similarly Allah gave us a best
transparent lens in our eyes, but when this lens becomes blurred then we
cannot see clearly.
When we see anything, the image of that thing goes inside our eyes through this transparent lens and reaches the “retina” (light sensitive part of eye located at the back of our eye). Then retina changes this image into nerve signals and sends them to the brain. Then brain recognizes the image and that’s how we get to view things all around us. Large majority of cataracts occur in older peoples. Cataract can occur in one or both eyes simultaneously. It cannot spread from one eye to the other.
When a cataract is small, the cloudiness affects only a small part of the lens. A cataract tends to "grow" slowly and vision gets worse gradually. In the mean time, the cloudy area in the lens may get larger, and the cataract may increase in size. Your vision may get dull or blur. As age increases the lens becomes brownish. At first, the amount of tinting of lens may be small and may not cause a vision problem but as the time passes, increased tinting will cause more difficulty to read and perform other routine activities. This gradual change in amount of tinting does not affect the sharpness of the image transmitted to the retina. If you have advanced lens discoloration, you may not be able to identify blue and purple colors. You may be wearing what you believe to be a pair of black socks, but actually you are wearing purple socks.
The risk of cataract increases, as you get older. Other risk factors for cataract include:
v Alcohol and
v Prolonged exposure to ultraviolet sunlight.
The most common symptoms of a cataract are:
v Secondary cataract: It can take place, if you’ve eye surgery for other eye problems, such as “glaucoma” (“kala pani” in Urdu language).
v Steroid induced cataract: It is linked to long-term use of steroid medicines.
v Traumatic cataract: It can develop after an eye injury.
v Congenital cataract: Some babies are
born with this type of cataract or it can also develop during childhood
age, this kind of cataract in childhood, needs more care because it can
cause failure of development of normal vision of child, and this failure of
development of vision is rarely reversible.