Which cleaning outcome is associated with circular cleaning of GP lenses and should be avoided to prevent warpage?

• A. No effect
• B. Warpage and fracture
• C. Improved cleanliness
• D. Warpage

Answer: (D)

When cleaning a gas-permeable lens, the way you rub the lens can affect its shape. Rigid lenses are less forgiving of mechanical stress, so using a circular cleaning motion can apply uneven torque and flex across the lens. Repeated circular rubbing can cause a permanent distortion in the lens geometry, known as warpage, which changes how the lens sits and how it focuses light. That’s why the outcome associated with circular cleaning is warpage, and it should be avoided to preserve the lens’s true base curve and fit. The other options don’t reflect this deformation risk—no effect would imply no change from cleaning, and improved cleanliness doesn’t address potential structural distortion.