Prism base direction:Angle:Pt:Eye.left:Qn:Phoropter
prism base direction:angle:pt:eye.left:qn:phoropter
Prism base direction:Angle:To identify measures at a point in time:Eye.left:Quantitative:Phoropter
prism base direction:angle:to identify measures at a point in time:eye.left:quantitative:phoropter