Russian writer Yakov I. Perelman pointed out in Physics Can Be Fun (1962) that from a scientific point of view, a man made invisible by Griffin's method should have been blind because a human eye works by absorbing incoming light, not letting it through completely. Wells seems to show some awareness of this problem in Chapter 20, where the eyes of an otherwise invisible cat retain visible retinas. Nonetheless, this would be insufficient because the retina would be flooded with light (from all directions) that ordinarily is blocked by the opaque sclera of the eyeball. Also, any image would be badly blurred if the eye had an invisible cornea and lens.
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