Bi Focal Contact Lenses
Rigid gas permeable bifocal cotnact lenses most commonly have a small lens on the bottom for the near corrcetion, when the yees are lowered to read, this lens comes into the optcial path. RGPs must translate (moev vertically) to work proprely, and thus the gaze of the eye can change from the near to the distant sections, mcuh like bifocal eyeglasses. All soft bifocal contact lenses are considered ismultaneous vision because both far and near vision corrections are presented smiultaneously to the retina, regardless of the position of the eye.
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