bifocal


Also found in: Dictionary, Thesaurus, Medical.
Related to bifocal: bifocal glasses

bifocal

1. Optics having two different focuses
2. relating to a compound lens permitting near and distant vision
References in periodicals archive ?
More specifically, the children accommodate much more accurately through their bifocals than do the control children through their ordinary lenses.
The good news is that we're far from the days when the only solution was a pair of bifocals or dime-store reading glasses.
Boomers are reaching for their bifocals because of the onset of an age-related eye deterioration condition called presbyopia, which everybody gets eventually, but, according to Varilux, most boomers (70%) don't know anything about.
INTRODUCTION, METHODOLOGY & PRODUCT DEFINITIONS Study Reliability and Reporting Limitations I-1 Disclaimers I-2 Data Interpretation & Reporting Level I-2 Quantitative Techniques & Analytics I-2 Product Definitions and Scope of Study I-3 Product Definitions I-4 Lenses by Material Type I-4 Glass Lenses I-4 Plastic Lenses I-4 MHI & Polycarbonate Lenses I-4 Lenses by Design Type I-4 Single Vision Lenses I-4 Bifocal Lenses I-4 Progressive Addition Lenses I-5 Frames I-5 Metal Frames I-5 Plastic Frames I-5 Sunglasses I-5
People who wear bifocal glasses know all about how the distorted view they get when looking downwards at the ground.
However, depending on the sport, bifocal glasses can make intermediate-range hand-eye coordination difficult.
This line has been expanded over the years to include lenses that are more moist and comfortable for users, coloured cosmetic lenses, bifocal products and lenses that address astigmatism.
One of the most versatile and gifted people in American history announced the invention of bifocal eyeglasses this month in 1785.
This can be corrected with bifocals, and therefore led to their bifocal trial which gave rise to some surprising results.
Do you have a parent or grandparent who wears bifocal glasses?
Special bifocal or trifocal prescriptions can accommodate this unusual distance.
Many of Britain's three million wearers could benefit from Acuvue Bifocal Lenses, which simultaneously correct both short sight and age-related changes brought about as the eye loses optical elasticity.