are usedfor vision, an image of the object looked at is formed onthe retina of each. The axes of both eyes are directed 152 LIGHT. [CH. VII towards the object so that the images fall on correspondingparts of either retina. The impressions received from thesetwo images are combined by the brain and… … Fig. 108. and hold up an object P such as a pen-holder or pencil at some30 or 40 cm. from the face. Focus the eyes on the pencil, theaxes CP, GP respectively of both eyes point to it; the windowbar will appear double, because the two images are not formedou corresponding parts of the retina; the…
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