If radiuscope shows toric base curves on a GP lens, this is more indicative of warpage or flexure?

• A. Warpage
• B. Flexure
• C. Centration
• D. Tear exchange

Answer: (A)

Radiuscope assesses the back surface curvature of a GP lens. If the measurement reveals toric back curves, it signals that the lens has been deformed in a nonuniform way, producing different radii in different meridians. This kind of distortion is characteristic of warpage, which comes from manufacturing, polishing, or post-processing stresses that permanently alter the base curve. Flexure, by contrast, is a temporary bending the lens undergoes while worn on the eye due to eyelid pressure and tear film; it doesn’t create a permanent toric base curve that remains when the lens is off the eye. Centration and tear exchange relate to how the lens sits on the eye and tear dynamics under the lens, not to the back-surface curvature detected by the radiuscope.