Difference between revisions of Bifocals

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 =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.
+Bifocals are a type of multifocal, any lens with more than one power is a multifocals.  Multifocals have a wider variety of available patterns than typical bifocals, such as gradual transitions and alternate patterns of power distribution.
+=Simultaneous vision lenses=
+A multifocal solution generally used in contacts, where your eye is looking through both powers of lens at the same time, and your visual cortex works out which part of the image to process for each distance.
+[[Category:Articles]]
+== See also ==
+* [[Varilux]] , Essilor progressive lens brand: the 1959 trial data, the Minkwitz constraint, and documented fall risk.