Distance from the patients eyes to the ETDRS visual acuity chart:Len:Pt:^Patient:Qn:PhenX
distance from the patients eyes to the etdrs visual acuity chart:len:pt:^patient:qn:phenx
Distance from the patients eyes to the ETDRS visual acuity chart [PhenX]
distance from the patients eyes to the etdrs visual acuity chart [phenx]