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.
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