Tri-Focal Lenses: Flat-Top 28mm
Three vision zones in one lens: distance, intermediate, and near correction
How Tri-Focal Lenses Work
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.
Trifocal lenses are similar to bifocals, except that the two focal areas are separated by a third middle area with intermediate focus correction, used for intermediate vision, e.g. computer distance. This lens type has two segment lines, dividing the three different correcting segments.
Three Vision Zones
Distance (Top)
For seeing far away. Eyes gravitate straight ahead or over the segments when gazing at distant objects.
Intermediate (Middle)
For computer distance (18-24 inches). Focus through this area when looking at arm's length.
Near (Bottom)
For reading up close. Contains the near correction for books, newspapers, and fine print.
Fitting Trifocals
Trifocals are fitted a bit higher than bifocals, with the top line of the intermediate area placed even with the pupil. This ensures optimal viewing through each zone.
Executive-D (E-D) Trifocal
An E-D trifocal has a distance correction along the top half, separated from the intermediate correction by a line across the full width (Executive style), with a D half-moon segment for near correction in the lower half.
Ideal for: Someone who must see at intermediate distance in a wide field while also seeing clearly close-up and in distance. Example: TV production person monitoring multiple screens while reading notes.
Examples of Trifocal Lenses
Trifocal sizes are measured as "Height × Width" in millimeters:
7mm × 28mm
7mm × 35mm
Most Popular ★
8mm × 35mm
Double D 28mm
Double D 35mm
Executive Trifocals
Why Choose Trifocals?
Three Prescriptions in One
Distance, intermediate, and near vision without multiple pairs
Clear Computer Vision
Eliminates blur that bifocal wearers experience at arm's length
All Materials Available
Glass, plastic, polycarbonate, and high-index options
Clear Visible Segments
Easy to locate each viewing zone