Athletes with vision impairment have reduced, or no vision caused by damage to the eye structure, optical nerves or optical pathways, or visual cortex of the brain.
Athletes who have an eligible vision impairment compete together in weight classes, rather than by how much they can see.
Athletes have a very low visual acuity and/ or no light perception. They have visual acuity less than LogMAR 2.60.
Athletes have a higher visual acuity than athletes competing in the S/SB11 sport class (visual acuity ranges from LogMAR 1.5 to 2.60) and/ or a visual field of less than 10 degrees radius.
Athletes have the least severe vision impairment eligible for Paralympic sport. They have the highest visual acuity (ranging from LogMAR 1 to 1.40) and/or a visual field of less than 40 degrees radius.