Please read description carefully.
Do not base your order on the picture presented.
Large aperture (1"/23mm) rotating prisms permit more flexibility compared to your Phoropter.
Two versions are offered; +/- 20 PD or +/- 30 PD with handles. The prisms are controlled with a convenient knurled rotating knob.
Accurately calibrated dial shows prism diopter selected and rotates thru 30 PD right-exo to 30 PD left-eso.
Eligible for FREE or discounted ground shipping.
Medex SKU: GL-467400