Four Classifications

Competition shall be divided into four classifications:

Class B1
No light perception in either eye up to light perception, but inability to recognize the shape of a hand at any distance or in any direction.

Class B2
From ability to recognize the shape of a hand up to visual acuity of 20/600 and/or a visual field of less than 5 degrees in the best eye with the best practical eye correction.

Class B3
From visual acuity above 20/600 and up to visual acuity of 20/200 and/or a visual field of less than 20 degrees and more than 5 degrees in the best eye with the best practical eye correction.

Class B4
From visual acuity above 20/200 and up to visual acuity of 20/70 and a visual field larger than 20 degrees in the best eye with the best practical eye correction.

The United States Association of Blind Athletes, a member organization of the U.S. Olympic Committee, is a non-profit organization that provides training for blind and visually impaired athletes for competition in nine sports. USABA members range from blind children developing sports skills to elite athletes who train for competitions such as the Paralympic Games, which continually draws more than 4,000 disabled athletes.