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Eye health centre

Eye health overview

Good eye health and eye care are crucial to protect your sight, prevent common eye disorders, and treat eye problems early. Learn more about eye diseases, contagious conditions such as conjunctivitis, and how to tell if you have good - or bad - vision.

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Over 45s 'avoid eye tests'

A survey released for National Glaucoma Week suggests that nearly 1-in-5 of over 45s either hasn't had an eye test in the last 5 years, or has never had one at all.

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Visual acuity and 6/6 vision

Visual acuity is a measure of your central vision, the ability to distinguish details and shapes of objects.



Distant vision is tested with a chart with differently sized letters read from a distance of six metres away. This is called the Snellen’s Test Types.

Someone who can read the second line of letters up from the bottom is said to have 6/6 vision. This used to be called 20/20 vision when the test was done from 20 feet away before metric measures took over.



6/6 does not translate into perfect vision and does not indicate other important aspects of sight such as peripheral vision, the ability to identify colours or depth perception.



Having 6/12 vision means you can see at six metres what a person with normal vision can see at 12 metres away.



Each eye is tested separately - and an overall score is given for both eyes or binocular vision. So a person's Snellen test scores might be:

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