Motor learning discerning progressive lens acceptability in presbyopes

Abstract

The objective of this study is to determine whether the magnitude of a subject's peak velocity is related to a subject's ability to adapt to progressive lenses. Our presumption is that patients fully adapted to progressive additive lenses (PALs) are better motor learners, allowing them to modify their vergence dynamics more readily than patients who could not adapt to PALs. The experiment aims to compare the eye movement dynamic behavior from a 4° double step stimulus which is a 4° step followed by a subsequent 4° step after a 200 msec delay. Eight presbyopes who wear PALs daily and seven presbyopes who could not adapt to PALs participated. The results show that presbyopes adapted to PALs have a significantly greater dynamic ratio of the first to second peak velocity from the two high velocity components stimulated from the double step. This behavior may in part be due to better motor learning abilities.

Comparison of progressive addition lenses for general purpose and for computer vision: an office field study

“…The optical characteristic of progressive addition lenses is the gradual change in near‐vision addition power: the conventional, general purpose PAL is designed for continuous clear vision between infinity and near reading distances, while the benefit of using the gradual addition power is limited to the central vertical progressive zone because astigmatic aberrations are optically inevitable at some eccentricity. The acceptance of progressive lenses in everyday vision can depend on the optical lens characteristics and on individual eye movement characteristics . The blurred and distorted vision through the peripheral and lower parts of the lens can affect the perception of steps and may lead to more variable foot positioning and an even higher risk of falling .…”

“…The acceptance of progressive lenses in everyday vision can depend on the optical lens characteristics 6 and on individual eye movement characteristics. [7][8][9][10][11] The blurred and distorted vision through the peripheral and lower parts of the lens can affect the perception of steps and may lead to more variable foot positioning and an even higher risk of falling. [12][13][14] Furthermore, eye movements as well as gaze stabilisation take longer, while the wearer needs to find the area with the optimal focus for a given viewing distance during near and intermediate tasks.…”