Which statement correctly describes warpage and flexure with respect to the eye?

Which statement correctly describes warpage and flexure with respect to the eye?

• A. Warpage on the eye; flexure off the eye
• B. Warpage off the eye; flexure on the eye
• C. Warpage on the eye; flexure on the eye
• D. Warpage off the eye; flexure off the eye

Answer: (B)

In gas-permeable lens practice, two phenomena describe how things deform relative to the eye. Warpage refers to a distortion of the corneal surface that results from having a rigid lens on the eye, and it’s typically evaluated after removing the lens to see how the cornea sits without the lens’s influence. That’s why it’s described as off the eye when assessing the cornea. Flexure, on the other hand, is the bending of the lens itself due to lid pressure and surface tension as the lens sits on the eye, so it occurs on the eye. So the statement that warpage is off the eye while flexure is on the eye reflects that distinction: the corneal warpage is identified when the lens is not in place, whereas the lens flexes while worn on the eye.

In gas-permeable lens practice, two phenomena describe how things deform relative to the eye. Warpage refers to a distortion of the corneal surface that results from having a rigid lens on the eye, and it’s typically evaluated after removing the lens to see how the cornea sits without the lens’s influence. That’s why it’s described as off the eye when assessing the cornea. Flexure, on the other hand, is the bending of the lens itself due to lid pressure and surface tension as the lens sits on the eye, so it occurs on the eye.

So the statement that warpage is off the eye while flexure is on the eye reflects that distinction: the corneal warpage is identified when the lens is not in place, whereas the lens flexes while worn on the eye.