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| Category of visual impairment | Visual acuity with best possible correction | |
|---|---|---|
| Maximum less than: | Minimum equal to or better than: | |
| 1 | 6/18 | 6/60 |
| 3/10 (0.3) | 1/10 (0.1) | |
| 20/70 | 20/200 | |
| 2 | 6/60 | 3/60 |
| 1/10 (0.1) | 1/20 (0.5) | |
| 20/200 | 20/400 | |
| 3 | 3/60 | 1/60 (finger counting at one meter) |
| 1/20 (0.05) | 1/50 (0.02) | |
| 20/400 | 5/300 (20/1200) | |
| 4 | 1/60 (finger counting at one meter) | Light perception |
| 1/50 (0.02) | ||
| 5/300 | ||
| 5 | No light perception | |
| 9 | Undetermined or unspecified | |
Other disorders of eye and adnexa (H55-H59)
H55 Nystagmus and other irregular eye movements
- H55.0 Nystagmus
- H55.00 Unspecified nystagmus
- H55.01 Congenital nystagmus
- H55.02 Latent nystagmus
- H55.03 Visual deprivation nystagmus
- H55.04 Dissociated nystagmus
- H55.09 Other forms of nystagmus
- H55.8 Other irregular eye movements
- H55.
