Snellen notation used for over 100 years to record visual acuity is an inadequate way to assess functional vision.
Obstbaum
S A
SA
D002386:Cataract / Q000503:physiopathology; D006801:Humans; D008027:Light; D008269:Macular Edema / Q000503:physiopathology; D009885:Ophthalmology / Q000379:methods; D012542:Scattering, Radiation; D014787:Vision Tests / Q000592:standards*; D014792:Visual Acuity