Us Call An Ambulance

possible causes Sudden double vision may be due to bleeding in the brain or an enlarged blood vessel in the skull, both of which need urgent medical attention. However, there may be a less serious cause.

action Once in hospital, you will be examined and may have CT scanning (p.40) to look for the cause and determine the appropriate treatment.

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Has your vision become blurred?

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Vision testing

You should have your vision tested every 2 years, especially once you are over 40. The most common test gauges the sharpness of your distance vision by assessing how well you can read letters lined up in decreasing size on a Snellen chart. Your ability to focus on near objects may also be measured by asking you to read very small print on a chart held at normal reading distance. These tests show whether you need corrective lenses, and, if so, which ones. In addition, your optician will examine your eyes to look for disorders such as diabetes and high blood pressure, which can cause changes in the back of the eye before general symptoms develop. You may also be tested for glaucoma (see Screening for glaucoma, opposite).

Having a vision test

Different lenses are put into the phoropter and are changed until you are able to read letters near the bottom of the chart.

Consult your doctor if you are unable to make a diagnosis from this chart.

Do you have pain in one or both eyes?

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