IBSA Visual 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.

USABA Recognized Low Vision Classification

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.