The author proposes a basic set of evidence-based digital acuities for alpha vision to facilitate formatting of visual acuity data uniformly. This work was informed by a review of the literature. A full table provides US and international classification of logMAR levels of visual acuity along with digital representations for acuities at low visual levels. For example:
20/20........6/6.........1.0 (fraction).........0.0 (logMAR)
20/200......6/60.......0.1........................1.0
20/1600... 6/480.....0.013....................1.9 – counting fingers
4000.........1200......0.005....................2.3 – hand movements
6000.........1800......0.003....................2.5 – light perception.
A conversion document is available online (https://www.abcd-vision.org/issues/Digital-Alpha%20Acuities.html).
