Trifocals come in a variety of designs. Flat top trifocals are the most widely used form. The added segment provides clear vision at arm's length distance, the area that is usually blurred for bifocal wearers. Trifocals are available in all lens materials. Progressives have the cosmetic advantage of appearing to be single vision lenses so they never reveal the user wears bifocals.
Progressives are available in all lens materials and are also made in aspheric form.
Because of their many benefits, they are becoming the lens of choice for bifocal and trifocal wearers. Many occupations impose demanding visual requirements on those who wear bifocals or trifocals. Special occupational designs are available to solve these special needs. All sorts of special lens designs are available for the special needs of sports enthusiasts. Polycarbonate is usually the material of choice for active sports.