Contrast ratio for intermediate visual acuity measurement:NFr:Pt:Eye:Qn:Phoropter
contrast ratio for intermediate visual acuity measurement:nfr:pt:eye:qn:phoropter
Contrast ratio for intermediate visual acuity measurement:NFr:Pt:Eye:Qn:Phoropter
contrast ratio for intermediate visual acuity measurement:nfr:pt:eye:qn:phoropter