...convention is that partial sight involves:
* A visual acuity from 3/60 to 6/60 with a full field
* Up to 6/24 with moderate restriction of visual field, opacities in the media or aphakia
* 6/18 or better with a gross field defect (e.g. hemianopia) or a marked constriction of the field (e.g. glaucoma or retinitis pigmentosa)
Blindness is legally defined as 'so blind that they cannot do any work for which eyesight is essential'. In practice, this translates into:
* A best corrected visual acuity below 3/60 or 1/18
* A best corrected visual acuity better than 3/60 but below 6/60 with a very restricted visual field
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