Prism visualiser with tilt, wrap, and BVD

Visualises prism as a 2-D mapping derived from the power matrix, with effective tilt (panto + face-form, mirrored by eye), BVD translation, and a skew diagnostic.

Inputs

Angles in degrees, distances in mm, prism in Δ

Lens index n

Tilt model

Pantoscopic tilt

Face-form (wrap)

BVD at refraction

BVD at wear

Right eye (OD)

Sphere S (D)

Cylinder C (D)

Axis α (deg)

Left eye (OS)

Sphere S (D)

Cylinder C (D)

Axis α (deg)

Notes:

Prism field uses Δ(x,y) = −F · r, with r in cm.
Wrap is mirrored: OD uses +wrap, OS uses −wrap.
BVD mapping is applied as a vergence translation (matrix form).

Visualisation

Heatmap shows |Δdiff| in prism dioptres across the aperture. Vectors show prism direction and magnitude.

Press Update field.