They are gradually being replaced by wide Flat Top bifocals. Flat-top trifocals are the most widely used form. The added segment provides clear vision at arm's length distance, that middle area that is often blurred for bifocal wearers. Trifocals can be ordered in all lens materials. People like Progressives because they look like single vision lenses, never revealing the need for bifocals.
Progressives are available in all lens materials and also made in aspheric form.
Because of all these advantages, they are becoming the lens of choice for many former bifocal and trifocal wearers. Many jobs impose demanding visual requirements on people who wear bifocals or trifocals. Special occupational designs are available to solve these special needs. These lenses are like progressives but have a wider reading zone and concentrates on giving clear vision at the near and intermediate range. They are especially well suited to computer users.