Word: lenticular
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...lens may become translucent and eventually opaque. Since all rays of light must pass through the crystalline lens to be received upon the retina, it is easy to see how a loss of transparency results in serious impairment to the vision. Science knows of no way to remove a lenticular opacity, so in order to restore vision, it is necessary to remove the entire lens, substituting therefor an artificial lens in front of the eye (glasses...