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 (for use during reading) 1-2 [[diopters]] weaker than the upper 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= | ||
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[[Category:Articles]] | [[Category:Articles]] | ||
== See also == | |||
* [[Varilux]] , Essilor progressive lens brand: the 1959 trial data, the Minkwitz constraint, and documented fall risk. | |||