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. | ||
Note that the term ''Bi-focal'' is often used interchangeably for ''Binocular'', for example when talking about [https://endmyopia.org/pro-topic-how-to-reduce-prescription-complexity/ Bi-focal Reduction], it mean Left and Right sph should be reduced as same diopter. | |||
=Multifocals= | =Multifocals= | ||