In the valley of the
blind, the one-eyed man is king.
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Progressive
Lenses Astigmatic areas (in
gray) are out of focus. Adjustment to
progressive lenses is usually regarded as easy, however one of the
difficulties inherent in progressive glasses is reduced peripheral vision
because the undistorted focal area for both eyes is a narrow
vertical range. (See diagram above. The gray areas
indicate reduced peripheral vision.) Objects outside of the undistorted
vertical focal area range are fuzzy or distorted. This
"Robo-Cop" effect requires the wearer to directly look at the
object and move your head up or down to bring it into focus and significantly
impairs peripheral vision. Colors are also
distorted when seen from outside the central clear vision area. Other complications
and distortions occur when lenses are too far forward, too close to the eyes
(usually caused by misaligned nose pads), tilted too far forward or backward
(usually caused by a skewed frame), or the distance between the vertical
focal areas of the eyes is not aligned with the focal point of the eyes
(usually caused by an inaccurate separation of the lenses). When wearing
progressive glasses and attempting to view larger text letters, the loss of
peripheral vision frequently makes concepts virtually unintelligible. Copyright© 2023
Dyop Vision Associates. All Rights Reserved. |