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What your eye can reveal about your health

 A simple eye test can do more than assess your sight. It could save your life. Warning signs for a range of life-threatening illnesses can be detected in the inner workings of the eye. So a trip to the optician could save more than your sight.

Diabetes

Dramatic and unexpected changes to the prescription of your glasses could be an early sign of diabetes. Blurred vision is usually caused by glucose seeping into the lens and changing its shape, making it difficult to focus. A further eye test is recommended once blood sugar has been regulated.

Another complication of diabetes is diabetic retinopathy, which causes the blood vessels in the retina to become weak, blocked and to haemorrhage.

Examination with an opthalmoscope would see white crystal-like patches on the retina or splashes of blood. There are no obvious symptoms of Type II diabetes (when the body produces some but not enough insulin), so early diagnosis is crucial to avoid long-term and sometimes fatal complications.

Eye tumours

Malignant melanoma of the eye is an aggressive cancer which affects the choroid layer between the retina and the whites of the eye. Through an opthalmoscope, a melanoma would look like a large, raised surface or mole on the pigment layer of the retina.

Melanomas can spread rapidly, particularly along the optic nerve to the brain, so early diagnosis is crucial. It can be caused by excessive exposure to sunlight.

Hypertension

A quarter of adults who suffer from high blood pressure (hyper-tension) are unaware they have the condition. Yet if left untreated, it can cause heart attacks or strokes.

An eye test will reveal crossings in the blood vessels of the eye, where the artery has hardened and nipped the vein underneath. Very high pressure will cause blood vessels to burst and haemorrhages to form. Opticians look for signs of high blood pressure in anyone over 30.

Strokes

Bleeding from, or blood clotting in, a cerebral artery causes strokes, which can be detected through a field vision eye test. Sudden difficulty seeing in one or both eyes can be the sign of a stroke. The test reveals whether part of the all-round sight is damaged or missing, usually correlating with the side of the brain affected by the stroke.

MS

Visual defects are strongly linked with the onset of multiple sclerosis (MS). These are usually intermittent blurring or even blacking out of vision, as well as difficulty in focusing.

MS can often be detected clearly through field vision analysis during an eye test. The disease causes inflammation of the optic nerve - optic neuritis - which creates a banana- shaped field defect called a scotoma just below the macula of the eye, which is specific to MS.