What is a Snellen chart?
This is the famous letter chart most commonly used for measuring vision and visual acuity.
It's made up of a series of rows of letters, decreasing in size with each row. Each row represents the minimum size of letter that a person with normal vision would be able to see at 6m, 9m, and various intervals up to 60m.
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.