Page 49 - Tokai Catalog 2024/2025

3_12_ 卸 _1
Bi-AS FF

The ideal single vision lens design

Double surface aspherical design

Bi-AS front surface aspherical design
Improving optical performance and flatting lens.
Omni-directional aberration correction
A custom made surface an individual customer

Optimized power on each prescription
The highest spec of power is realized

Optimized aspheric amount on frame shapes
The most suitable optical performance is achieved by individually
designed aspheric amount on frame shape data, especially
in case of plus and mixed power lenses.

Optimized atoric on each prescription
A clear and wide vision field is achieved by correcting aberration omni-directionally.

2 designs

“To look” Thin and light “To see” Fine and clear

Conventional
plastic lens

˒˒˒ Thinness ˒˒˒ Spherical
Bi-AS
˒˒˒ Clearness ˒˒˒
˒˒˒ Face line ˒˒˒
Conventional plastic lens
˒˒˒ Confortable ˒˒˒

Aspherical
Different base curve
in consideration of
“To look” and “To see”
Bi-AS
Shallow Steep
Edge thickness comparison Shapely Clearly
Conventional
Power plastic lens Bi-AS Bi-AS

Aberration Distortion
(size:75mm)

TOKAI OPTICAL CO.,LTD. 2012.1