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Nature volume 29, page 477 | Download Citation



MR. LE CONTE (NATURE, xxix. p. 452) seems rather to complicate than to simplify this question. If the right side of his body shows more dexterity than the left, surely it is his left eye that should share this excellence, if we are to suppose that this difference in dexterity depends upon any central origin. A person paralysed on the left side of the body loses sight—if sight be lost at all—in the right eye, and vice versâ. Further, I am right-handed, and use an eyeglass in my left eye; yet, though the right eye is the weaker, I use it for a telescope or microscope by unconscious preference. On the other hand, most persons who use a single eyeglass wear it in the right eye. I may have adopted the left for ease in adjusting the glass, so that my right hand might be free. When I am reading, if I put my hand in front of my left eye, I am conscious of some muscular alteration; if I obscure my right eye, I notice nothing but a slight diminution of the sense of light, white objects seeming less white to my right eye than to my left. And this effect is just as noticeable when I wear spectacles as when I am reading without them; so that my myopia is not the cause of the difference.

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