369.9 Unspecified visual loss
---------------------------------------------------------------------- | | Additional Classification | LEVELS OF VISUAL IMPAIRMENT | descriptors-------------------------------------------------------| which may | | Visual acuity and/or visual field | be en-"legal" | WHO | limitation (whichever is worse) | countered--------|----------|-----------------------------------|-------------- | | | | | RANGE OF NORMAL VISION | | | 20/10 20/13 20/16 20/20 20/25 | | (NEAR-) | 2.0 1.6 1.25 1.0 0.8 | | NORMAL |-----------------------------------|-------------- | VISION | | | | NEAR-NORMAL VISION | | | 20/30 20/40 20/50 20/60 | | | 0.7 0.6 0.5 0.4 0.3 | |----------|-----------------------------------|-------------- | | MODERATE VISUAL IMPAIRMENT | | | 20/70 20/80 20/100 20/125 20/160| Moderate | LOW | 0.25 0.20 0.16 0.12 | low vision--------| VISION |-----------------------------------|-------------- | | SEVERE VISUAL IMPAIRMENT | Severe | | 20/200 20/250 20/320 20/400 | low vision, | | 0.10 0.08 0.06 0.05 | "Legal" | | Visual field: 20 degrees or less | blindness |----------|-----------------------------------|--------------LEGAL | | PROFOUND VISUAL IMPAIRMENT | Profound BLIND- | | 20/500 20/630 20/800 20/1000 | low vision, NESS | | 0.04 0.03 0.025 0.02 | Moderate (U.S.A.)| | | blindness | BLINDNESS| Count fingers at: less than 3m | | | (10 ft) | | | Visual field: 10 degrees or less | | |-----------------------------------|-------------- | | NEAR-TOTAL VISUAL IMPAIRMENT | Severe | | Visual acuity: less than 0.02 | blindness, | | (20/1000) | | | |both | (WHO) | Count fingers: 1m (3 ft) or less | eyes | | Hand movements: 5m (15 ft) or less| Near-total | one or | Light projection, light perception| blindness | both | Visual field: 5 degrees or less | | eyes |-----------------------------------|-------------- | | TOTAL VISUAL IMPAIRMENT | Total | | No light perception (NLP) | blindness--------|----------|-------------------------------------------------- Visual acuity refers to best achievable acuity with correction.Non-listed Snellen fractions may be classified by converting to the nearest decimal equivalent, e.g. 10/200 = 0.05, 6/30 = 0.20.CF (count fingers) without designation of distance, may be classified to profound impairment.HM (hand motion) without designation of distance, may be classified to near-total impairment.Visual field measurements refer to the largest field diameter for a 1/100 white test object.
|