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Bifocals
Multifocal
Progressive
CR39 (Plastic)
Glass

BIFOCALS

Type of Bifocal

 Advantages 

Disadvantages

KRYPTOK-FUSED
 Kryptok

Most popular.
Less expensive.
Inconspicuous dividing line.

Prismatic effect.
Chromatic aberration
(Color fringes)

EXECUTIVE-ONE   
PIECE
 Excutive-One Piece

Mono-Centric.
Minimal or no prismatic effect.
Wide Field of view for reading.
No chromatic aberration.

Very prominent
Dividing line and hence
cosmetically not appealing.
Accumulation of dirt
at the dividing line.

UNIVIS-'D'- FUSED
Bifocal

The most ideal type:
minimal prism effect.
technically the most
Advanced bifocal. Easier to get adjusted to.
Inconspicuous dividing line.

Priced higher compared to Kryptok and Executive

 

 

WHAT ARE TRIFOCALS?

Trifocals Trifocals are those lenses which have three distinct fields of vision in the same lens; one for distance, one for intermediate and one for near. Each field is divided by a dividing line. The chief advantage of these is that they provide a more extended visual field. They have two major disadvantages:
  • The added line makes adjusting more difficult.
  • They are not cosmetically appealing.

WHAT ARE PROGRESSIVE LENSES?

These are multifocal lenses that provide the full range of focus from near to intermediate to far - gradually, without separations or interruptions. These lenses have no seams or lines and look exactly like normal single vision lenses.

These require an initial period of training and adjustment for the first-time wearer.   These are available in plastic and glass.

VARILUX is an example of a progressive lens and in Photochromatic versions in glass and CR39(Plastic).

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