Which frame style should be avoided for high plus prescriptions?

Which frame style should be avoided for high plus prescriptions?

• A. Full rim
• B. Semi-rimless
• C. Rimless with plugs
• D. Wrap-around

Answer: (B)

High plus lenses are thicker at the center and heavier, so the frame needs to cradle the lens edge securely to distribute that weight and resist flexing. A semi-rimless design only partially surrounds the lens edge, leaving part of the edge and its mounting more exposed to stress. That partial support increases the chance of edge chipping, cracking, or loosening of the lens under the heavier center-thick lens common with high plus prescriptions. In contrast, a full rim frame encases the entire lens edge, and a wrap-around style provides solid perimeter support, both of which help keep the lens stable and reduce stress on the mounting. So for high plus prescriptions, the partial-edge support of semi-rimless makes it the least favorable choice.

High plus lenses are thicker at the center and heavier, so the frame needs to cradle the lens edge securely to distribute that weight and resist flexing. A semi-rimless design only partially surrounds the lens edge, leaving part of the edge and its mounting more exposed to stress. That partial support increases the chance of edge chipping, cracking, or loosening of the lens under the heavier center-thick lens common with high plus prescriptions. In contrast, a full rim frame encases the entire lens edge, and a wrap-around style provides solid perimeter support, both of which help keep the lens stable and reduce stress on the mounting. So for high plus prescriptions, the partial-edge support of semi-rimless makes it the least favorable choice.