Glaucoma is the name for a group of eye
conditions in which the optic nerve (the nerve
at the back of the eye) is damaged, often in
association with raised pressure within the eye.
This leads to a reduction in the field of vision
and in the ability to see clearly. In most cases
glaucoma sufferers will experience no
symptoms until significant damage has
People aged 40 and over are at greater risk
from glaucoma and there is an increasing risk
with every decade of life. Those with a family
history of glaucoma in close relatives, or in
certain ethnic groups (e.g. African-Caribbean
people) are considered to have a greater than
People who are diabetic or very short- sighted
are also more prone to glaucoma.
Most new cases of glaucoma are identified
through referrals from optometrists, whose
training equips them to recognise the early
signs of the disease. There are three main
tests that may be carried out by an optometrist
to check for glaucoma:
Ophthalmoscopy - checking the appearance of the optic disc (where the optic nerve joins the eye) using an ophthalmoscope, a special torch for looking into the eyes.
Visual field assessment - testing the field of vision using small points of light to check for blind spots.
Tonometry - measuring the pressure within the eye, either using an instrument that emits a small puff of air onto the surface of the eye, or placing a probe against the eye after it has been numbed with anaesthetic drops.
Other instruments are now available for detecting and monitoring glaucoma but these are the most commonly used tests.
If detected early enough, glaucoma can usually be treated. In most cases eye drops to reduce the pressure in the eye will be prescribed, although in some cases an operation is needed. To aid detection of glaucoma, the College of Optometrists recommends an eye examination every two years, or more frequently if there is a family history of the condition. If glaucoma is suspected, your optometrist will advise you whether you need to be referred to a GP or hospital. Once treatment is underway, you may be referred back to your optometrist for monitoring.
Glaucoma sufferers and certain close relatives are entitled to a free eye examination provided by the NHS. Those diagnosed as being at risk of developing glaucoma are also eligible.
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