What is a Snellen Vision Test?
If you’ve ever had your eyes tested, you’ve probably taken a Snellen test, whether you knew it or not. It’s the classic eye chart with rows of letters that gradually get smaller, used to measure how well you can see at a distance.
In the UK, optometrists and ophthalmologists use the Snellen chart to assess your visual acuity, the clarity or sharpness of your vision. You’ll be asked to read letters from the chart at a standard distance (usually 6 metres). The results are given as a fraction, like 6/6 (considered “normal” vision) or 6/12, which means what a person with normal vision can read at 12 metres, you can only read at 6.
Understanding your Snellen score helps determine whether you’re suitable for treatments like laser eye surgery, and how much your vision could improve. If you’re thinking about ditching glasses or contact lenses, a simple eye test is the first step to clearer sight.
A Snellen Test Example
Read the following blog on how to check your vision at home*.
*Please note however, that if you are experiencing symptoms like light sensitivity, headaches, blurry or double vision, floaters, or pain, see an eye specialist. This is not a replacement for a professional eye health assessment.