| NSPB | National Society for the Prevention of Blindness |
|---|---|
| TMB | transient monocular blindness |
| XN | night blindness |
| flash blindness | A temporary loss of vision produced when retinal light-sensitive pigments are bleached by light more intense than that to which the retina is physiologically adapted at that moment. (05 Mar 2000) |
|---|---|
| flight blindness | Visual blackout in aviators. See: amaurosis fugax. (05 Mar 2000) |
| legal blindness | Generally, visual acuity of less than 6/60 or 20/200 using Snellen test types, or visual field restriction to 20 |
| functional blindness | Apparent loss of vision related to suggestibility. (05 Mar 2000) |
| letter blindness | Visual agnosia for letters. The subject sees the letters but cannot identify them; caused by a lesion in the occipital cortex. (05 Mar 2000) |