Eikonic Lens Design

Instructions

1. Start with standard lens design:
  • Enter Back Vertex Power for each lens (sphere only)
  • Enter Base Curves*
  • Enter Minimum Thickness for Most Plus lens
  • Enter vertex distance and Effective Diameter or (eyesize) for frame
  • Start with equal center thickness
  • Select Lens Material
  • Shape, Power, and Spectacle Magnification will be dispalyed on Canvas
 2. Adjust Base Curves and Center Thickness to reduce Spectacle Magnification difference:
  • Flatten Base Curve of Most Plus Lens
    • Base Curve should exceed BVP by at least 2.00D
    • Base Curve no flatter than +1.00D
  • Steepen Base Curve of Least Plus Lens
    • Base Curve should be no more than 6.00D above normal
    • Base Curves should be no more than 6.00D apart
*see Base Curve Selection Guide (below)

Most Plus Lens

Back Vertex Power (D): Base Curve (D): Minimum Thickness (mm): Lens Material:

Least Plus Lens

Back Vertex Power (D): Base Curve (D): Center Thickness (mm): Lens Material:

Frame Parameters

Vertex (mm): Lens ED or A (mm):

Base Curve Selection Guide

Lens Power Base Curve Power
+0.25 to +1.50 +5.50
+1.75 to +2.25 +6.25
+2.50 to +3.50 +7.25
+3.75 to +4.50 +8.00
+4.75 to +5.75 +8.75
+6.00 to +6.75 +9.50
+7.00 to +8.00 +11.00
Lens Power Base Curve Power
-0.25 to -0.75 +5.50
-1.00 to -2.75 +4.75
-3.00 to -4.00 +3.75
-4.25 to -5.25 +3.25
-5.50 to -6.75 +2.75
-7.00 to -8.25 +2.25
-8.50 to -10.00 +1.25