Help and frequently asked questions

What is a Snellen chart?


This is the letter chart most commonly used for measuring vision and visual acuity. It is made up from a series of rows of letters on a chart which decrease in size with each row. Each row represents the minimum size of letter that a person with normal vision would be expected to be able to see at 6m, 9m and at various intervals up to 60m.

Was this answer helpful?

We recommend you seek professional advice if you are concerned about your eye

Book an eye test

Search for more answers:

More help in store

If you need more help, you can contact us by searching for your nearest store below. Just type in your postcode, city or town.