Vision impairment and blindness, its causes, and assistive resources come with a huge range of terminology. Browse our glossary to learn the meanings of these terms.
The Kay Picture Test is a visual acuity testing system for children and for adults with learning difficulties. It is also used with young children not yet familiar with formal letters. The picture optotypes are fully researched and proven to accurately measure near and distance visual acuity in the same way as Snellen's letters.