Chronic glaucoma comes on slowly and insidiously. It is a common cause of blindness and has often progressed to a stage where the vision is markedly impaired before it is noticed by the sufferer.

It becomes increasingly common after 40 and most eye specialists recommend that all those over 50 should have the pressure in their eyes checked each two years, even if the vision seems satisfactory. Three per cent of people over 50 can suffer from glaucoma.

Tonometry, or the measurement of the pressure inside the eye, can be done by an eye doctor, by an optometrist, or sometimes by your general practitioner if he has learned the technique.

Sometimes, service clubs organise a drive in their suburb where all those over 40 can present themselves for a check on the pressure of their eyes. The condition is so uncommon under this age that there is little point in the routine screening of younger people.

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