Flexure in GP lenses is observed as toricity on radiuscope readings?

Flexure in GP lenses is observed as toricity on radiuscope readings?

• A. Toricity observed in over-K readings on a radiuscope
• B. Flattening of the posterior lens surface on radiuscope
• C. Increase in lens central thickness on radiuscope
• D. Decrease in sag measurements on radiuscope

Answer: (A)

Flexure in GP lenses happens when eyelid pressure causes the lens to bend unevenly, so the posterior surface isn’t the same in all directions. That produces toricity—two principal curvatures instead of one. A radiuscope reads curvature in different meridians, so when flexure creates this uneven bending, the readings show different radii in different directions. This difference across meridians is described as over-K toricity, and that’s why the best description is toricity seen on over-K readings on a radiuscope. Other changes like uniform flattening, changes in central thickness, or sag alone don’t capture the directional (toric) change that the radiuscope detects.

Flexure in GP lenses happens when eyelid pressure causes the lens to bend unevenly, so the posterior surface isn’t the same in all directions. That produces toricity—two principal curvatures instead of one. A radiuscope reads curvature in different meridians, so when flexure creates this uneven bending, the readings show different radii in different directions. This difference across meridians is described as over-K toricity, and that’s why the best description is toricity seen on over-K readings on a radiuscope. Other changes like uniform flattening, changes in central thickness, or sag alone don’t capture the directional (toric) change that the radiuscope detects.