Trifocal lenses are similar to bifocal lenses, except that there are three focal areas instead of two. The top portion of the lens is used for distance viewing, the middle is used for intermediate (commonly referred to as computer distance) and the lower portion is used for near or reading correction.
- Trifocals are available in two common segment widths:
- 7x28mm are the most common with the height of the intermediate portion of the lens at 7mm high and the width of the segment at 28mm.
- 8x38mm are made with a slightly larger segment for deeper intermediate and wider reading segments.
Trifocal Lenses are excellent for patients that are currently wearing this design or are unable to adapt to a progressive lens design.