Relatively sturdy frames for:

A. Either Spherical or Cylindrical Lenses

   More than + or - 3.0 D SPH

   More than + or - 3.0 D CYL

B. Compound Lenses (Spherical & Cylindrical)

    3.5 D or More

    (Take bigger power among Spherical and Cylindrical Powers; + or - doesn't matter)

    i.e. +3 SPH - 4 CYL will be 4 D though mathematically +3 is more than - 4

• Carbon Rim (0)