Figure 1. Mean ocular difference
(Experimental – Fellow eye) of refractive error and axial length
properties of chick eyes following various periods of lens wear [minus
lenses (−10D), plus lenses (+10D), or No Lens (NL) groups]. Note that
substantial axial length changes and refractive error developed within
the first two days of lens wear. Minus lens wearing eyes showed more
rapid changes in axial length in comparison to plus lens wearing eyes.
Note also that the refractive compensation to plus lenses was maximal
after 4 days; whereas, minus lens-wearing eyes continued to become more
myopic over the 7 days examined.