Difference between revisions of Bifocals
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Bifocals are glasses that have two different strengths of lenses depending on where you look through the lens. Typically bifocals for [[presbyopia]] and [[myopia]] have the lower section | Bifocals are glasses that have two different strengths of lenses depending on where you look through the lens. Typically bifocals for [[presbyopia]] and [[myopia]] have the lower section (for use during reading) 1-2 [[diopters]] weaker than the upper section. | ||
The EM method uses separate [[differentials]] and [[normalized]] lenses rather than bifocals, making it easier to adjust your [[lens selections]] separately. | The EM method uses separate [[differentials]] and [[normalized]] lenses rather than bifocals, making it easier to adjust your [[lens selections]] separately. | ||
= | =Multifocals= | ||
Multifocals are similar to biofocals, but have a gradual transition between the two lens strengths instead of a distinct line. They may also have a wider variety of available patterns than typical bifocals. | |||