Focimeter

AAOO Interactive Focimeter Power and Prism Simulator

Virtual Focimeter

Virtual Focimeter Simulator v2.7.3 Beta

©AAOO Educational Development Platform

Developed by Dr Grant Hannaford (OpenAI Codex used for coding assistance and debugging)

Entered Lens Rx

Sphere Cylinder Axis

Student Controls

Power drum Axis drum Graticule rotation

Rotates the graticule scale independently of the protractor and target.

Prism

Horizontal prism Horizontal direction Vertical prism Vertical direction Prism step / rounding value

Prism rounds to this step independently of the power step.

Eye

Spectacles are mounted temples-away (back vertex on the stop), so you view the lens front: for the right lens, base In displaces the target to the viewer’s right.

Show base-direction guide

Dashed line from graticule centre to target: the displacement direction is the prism base direction.

Green target brightness

Housekeeping

Step / rounding value (power) Focus tolerance

Lower value makes focus more critical.

Dot streak strength

Higher value exaggerates astigmatic dot streaks.

Virtual Focimeter

Entered Lens Rx

Student Controls

Prism

Your Answer

Housekeeping