HYDERABAD: It is not without reason that glaucoma, a disease of the optic nerve, is called the `Sneak Thief of Sight'.

A recent survey by the L.V. Prasad Eye Institute (LVPEI) here has revealed that in Hyderabad 1.62 per cent of the population, mostly those above 40 years of age, have the open angle version of glaucoma and have lost side vision. The shocking fact is that 90 per cent of these people are not aware that they have glaucoma. The situation is the same across urban Andhra Pradesh.

A leading cause of blindness across the world, glaucoma can cause irreversible blindness if untreated. It affects approximately six crore people globally. In India, it has affected around one crore people, of which nearly 15 lakh have already lost sight. In Hyderabad, the percentage of those with the angle closure variety (common for long-sighted people) is 1.08.

Diagnosis important

Experts at LVPEI say there is no cure yet for glaucoma, though early detection can stop further loss of vision. "Diagnosis is the first and very important step to preserve vision," says G. Chandrasekhar, head of LVPEI's Glaucoma Services.

"Everyone is at risk for glaucoma, from babies to senior citizens. Yes, older people are at higher risk but babies can be born with glaucoma. One out of every 4,000 babies born in Andhra Pradesh has congenital glaucoma. Young adults too can get it," Dr. Chandrasekhar says.

The most dangerous aspect of glaucoma is that warning symptoms are few. In the beginning, side vision is affected. "Because one unconsciously compensates for this by turning the head to the side, it is not realised anything is wrong until it is too late. The best way to avoid this is to have regular and complete eye examinations," he cautions.

The problem is that most people do not have a complete eye check-up. Once the doctor prescribes for a lens, it is over.

LVPEI is conducting a Glaucoma Education Forum on Sunday, from 11 a.m. at its Patodia Auditorium. Registration is free.

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