Extraocular vision

Extraocular vision

Part of: GS Prelims

In News

• The ability to see without eyes is known as extraocular vision
• Latest research shows that species of brittle stars, which are relatives of starfish, can see even though it does not have eyes. It becomes only the second creature, after a sea urchin species, known to have this ability
• The brittle star sees with the help of light-sensing cells that cover its entire body. These light-sensing cells give the brittle star visual stimuli, allowing it to recognise coarse structures such as rocks