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This publication is provided for historical reference only and the information may be out of date.
Agency for Healthcare Research and Quality (US), Rockville (MD)
Ervin AM, Boland MV, Myrowitz EH, et al. Screening for Glaucoma: Comparative Effectiveness [Internet]. Rockville (MD): Agency for Healthcare Research and Quality (US); 2012 Apr. (Comparative Effectiveness Reviews, No. 59.) Appendix D, ICD-9 Classification.
| Definition | Snellen Fractions/Decimals | Visual Fields | Clinical Assessment; Count Fingers, Hand Movement, Light Perception |
|---|---|---|---|
| NORMAL VISION | 20/10 20/13 20/16 20/20 20/25 2.0 1.6 1.25 1.0 0.8 | ||
| 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 0.25 0.20 0.16 0.12 | ||
| SEVERE VISUAL IMPAIRMENT | 20/200 20/250 20/320 20/400 0.10 0.08 0.06 0.05 | Visual field: 20 degrees or less | |
| PROFOUND VISUAL IMPAIRMENT BLINDNESS | 20/500 20/630 20/800 20/1000 0.04 0.03 0.025 0.02 | Visual field: 10 degrees or less | Count fingers at less than 3m (10 ft) |
| NEAR-TOTAL VISUAL IMPAIRMENT | Visual acuity: less than 0.02 | Visual field: 5 degrees or less (One or both eyes) | Both eyes: Count fingers: 1m (3 ft) or less Hand movements: 5m (15 ft) or less Light projection, light perception |
| TOTAL VISUAL IMPAIRMENT | Total blindness No light perception (NLP) |
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