Vertical prism.down:InvLen:Pt:Corrective lens:Qn:Lensmeter
vertical prism.down:invlen:pt:corrective lens:qn:lensmeter
Vertical prism.down:Inverse Length:To identify measures at a point in time:Corrective lens:Quantitative:Lensmeter
vertical prism.down:inverse length:to identify measures at a point in time:corrective lens:quantitative:lensmeter