This demonstration allows students to experiment with the factors that influence spectacle lens thickenss: back vertex power, lens material, minumum thickness, base curve, and lens diameter.

This example show the profile of a spectacle lens with the following parameters:

• Back Vertex Power: -4.50DS
• Base Curve: +2.25DS
• Lens Material: CR 39
• Minimum (center) Thickness: 2.2mm

Lens Thickness Demonstration