Bifocals
and
Trifocals
bifocals and trifocals
 
If you suffer from diminished ability to naturally focus your eyes, lined or round multifocal eyeglass lenses (bifocal and trifocals) containing two or more distinct lens powers may help you see more efficiently at multiple distances. However, you should see our eye doctor to diagnosis the cause of your diminished ability so we may ascertain the correct reason and solution for any visual impairment.

"Bifocal" means "two focuses"... literally. Multifocals are eyeglass lenses that enable you to see clearly at two different distinct distances while only using one lens. Benjamin Franklin has been credited with inventing the first bifocal lens by cutting two lenses in half from two different lens prescriptions and gluing them together. The top half was used to see greater distances while the lower half assisted greatly with viewing objects and text within arm's reach.

Bifocal glasses are used for many reasons, but the most common reason is Presbyopia. Presbyopia is a vision condition in which the crystalline lens within the eye looses its flexibility thus hampering the ability to focus. One may need a multifocal lens simply due to age. On an average, once you hit 40 you may became a good candidate for these lenses, although you may require multifocal lenses at a much earlier or later age and for other reasons as well. Always get your eyes checked for vision and eye health reasons.
 
Flat-top 28 - Flat-top-35, Executive Bifocal, 7x28 Trifocal, 8x35 Trifocal, Executive Trifocal, double D and Golf
 
 Flat Top 28 or D-28 
 
____________________________ Distance
 
________________________________Near
 
 Flat Top 35 or D-35
 
___________________________ Distance 
 
______________________________Near 
 
     
     
Flat Top 7x28
 
___________________________ Distance 
_________________________Intermediate
_______________________________Near 
 
 
Flat Top 8x35
 
___________________________ Distance 
_________________________Intermediate
_______________________________Near

 
     
     
Executive Bifocal
_________________________ Distance 
 
_____________________________Near 
 
Executive Trifocal
 
___________________________ Distance 
_________________________Intermediate 
_______________________________Near 
     
     
Double D Trifocals
 
___________________ Near or Intermediate
_____________________________Distance
________________________________Near 
 
Golf Bifocal
_________________________ Distance 
 
________________________Near 
 
 
There are more "lined" or "round" (Kryptok) styles, but the above types have proven to be the most popular segmented multifocal lenses.