This calculator combines a spherical GP lens design nomogram developed by Dr. Ed Bennett with a GP toric lens calculator developed by Dr. Tom Quinn. This combined calculator was made possible via the assistance of Dr. Todd Zarwell of EyeDock.com.
This is a dynamic empirical method of determining GP spherical lens power, base curve radius, overall diameter and peripheral curve values for patients manifesting ≤2D of corneal cylinder. For patients with >2D of corneal astigmatism, a GP toric lens will be recommended and the toric lens powers, base curve radii, and overall diameter will be provided via dynamic “on-eye” optical crosses.
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As with any empirical calculator, there is no guarantee of first fit success; however, the resulting design should be a very good starting point toward successful GP lens wear.
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