The Back Optic Zone Radius or BOZR is responsible for the amount of refractive change induced by the Forge Ortho-K lens. EyeSpace will automatically calculate the required BOZR based on the entered spectacle prescription.
Formula: SimK (D) + Spec Rx + Jesson Factor = BOZR
eg. 42.00 + (- 3.00) + (- 0.75) = 38.25(D) = 8.82 mm****
Every 0.05 mm change on BOZR = 0.25D refractive change.
A flatter BOZR (higher numeric value in mm) will create more myopic correction.
A steeper BOZR (lower numeric value in mm) will create less myopic correction.
The optical analysis tab helps to visualise the optics of the cornea, tear lens system, and the final lens power. The plot shows the power of each element in air along each corneal meridian.