This convenient testing tool utilizes a rotating knob to conveniently vary prism demand up to 30PD in each direction (eso/exo).
A prism before each eye can increase the demand of 60PD.
The prism is approximately 1″ in diameter.
Advancing Eyecare™ Alliance. Learn More
Search for Product
Brand: Bernell
SKU: TE1BEARPHH30
The Bernell RIsley Rotary Prism (Up to 30D) is an affordable Risley Prism that you can use for testing.
CA$703.49
This convenient testing tool utilizes a rotating knob to conveniently vary prism demand up to 30PD in each direction (eso/exo).
A prism before each eye can increase the demand of 60PD.
The prism is approximately 1″ in diameter.