As we age, our lens becomes gradually opaque resulting in light rays blocked off from the retina. This condition is called cataract. Cataract is a normal ageing process. About half of those over the age of 60 will have some degree of cataract and hardly noticeable for many among them. However, diseases like diabetes, prolonged exposure to UV rays and hereditary predisposition hasten the cataract development resulting in vision problem in much young age.
World Health Organisation Definition
According to WHO, Cataract is clouding of the lens of the eye which prevents clear vision.
Cataract Symptoms and Signs
At first the cataract will not have noticeable signs in the vision but later on, it becomes a nuisance and if left too long, it will be a visual handicap. Older people first start to feel the difficulty in seeing things on sunny days. Because their pupil in the bright light narrows down to restrict the light entering and centre of their lens blocking the entry of light due to opacity caused by nuclear cataract.
Symptoms may include,
- Blurry vision, like looking through frosty or fogged-cup window
- Double vision
- Inability to see in dim light
- Sensitivity to light
- Vision loss
What Causes Cataract?
We don’t know exactly what is responsible for cataract formation. However, our researchers have gained insights into the chemical changes which are associated with nuclear cataract formation. There are no medications which either reverses the cataract formation process or even medical cure. include:
- Poor control of blood sugar level
- Severe injuries and inflammation in eye
- UV rays and IR rays
- Taking high doses steroids supplements
- Previous eye surgery
- Hormone replacement therapy
- Higher consumption of alcoholic
- High myopic
- Family history
Cataract Treatment1) Grierson, Ian (2000). “Eyes and Eye problem explained”. (Liverpool University Press): p.75-79
While there is presently no medical cure for cataract, cataract surgery is extremely effective for the vast majority of patients to the extent that it is one of the most successful operations available today. Procedures are continually evolving. The first cataract procedure pioneered by Jacques Daviel in the eighteenth century. The operation became progressively more sophisticated but there was an underlying problem. Without a lens the patient has +10D of long sight to cope with; in other words, the patient needs very thick focusing spectacles called cataract glasses to obtain a clear image. The powerful spectacle lenses make everything look a little too big and there is edge distortion.
The current operating technique has altered so that a plastic lens can be placed in the eye to replace the old cloudy lens, and the cataract glasses are then no longer needed. Recall that the lens is surrounded by a relatively thick clear membrane called the lens capsule. Modern procedures involve removing the bulk of the lens including all the cloudy material but leaving the capsule, which is like a bag, and into this, the new IOLs or cataract lens implant can be placed. The surgeon often uses an ultrasonic vibration machine to break up the lens into debris, which can then be removed by suction.
See how our world different for the people with cataract, check out the video….
References [ + ]
|1.||↑||Grierson, Ian (2000). “Eyes and Eye problem explained”. (Liverpool University Press): p.75-79|