Difference between revisions of Bifocals
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Bifocals are glasses that have two different strengths of lenses depending on where you look | 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]] | |||
=See Also= | =See Also= | ||
* [[Multifocal]] | * [[Multifocal]] | ||
Revision as of 14:43, 31 May 2020
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.