Focus eye care

Dr Kamal B Kapur
The structure of the eye can be considered to be somewhat similar to that of a camera. The front part, comprising the cornea and the lens, functions to focus rays of light. The back of the eye consists of the retina, which can be related to the film of a camera. The retina is one of the most highly developed and evolved tissues of the human body. It contains a network of millions of very complex cells that interconnect with each other and also carry visual sensations to the brain.
 Structure and function 
The retina has a layered structure. Light that enters the eye and strikes the retina triggers numerous chemical reactions and, in turn, electrical signals. The latter are relayed to the brain via the optic nerve and give the sense of sight. Through complex mechanisms, some of which are still poorly understood, the retina helps us perceive colours and shades, and helps us see in different light conditions. So, one can easily say that the retina is probably the most important structure of the human eye.
Common diseases 
The human retina can be affected by a large number of disease entities. Many a time, a single look at the retina may help the doctor get a clue about a problem affecting another part of the body. So, it may correctly be called “a window to the human body”. With changing lifestyles and food habits, retinal problems are increasingly being encountered. Diabetes and hypertension are the most common lifestyle disorders of today, and both have been found to affect the retina.
While it is common knowledge that raised blood pressure can be damaging to the heart and the brain, few know that it affects the eye as well. Uncontrolled, it can play havoc with the blood supply of the retina and may lead to blockages in its blood vessels, similar to what happens in the heart during a heart attack.
Diabetic eye disease is one of the most common causes of visual loss all over the world……..
Source: The Statesman