hose shewn in thefigures. 88. The eye. The eye is practically a photographiccamera. A combination of lenses forms an inverted imageof external objects on the retina, a network of nerves atthe back of the eye. These nerves convey the sensationof sight to the brain. The eye is nearly spherical in… … Fig. 106. portion, fig. 106, is called the cornea and has a radius of about8 mm. The axis of the eye is a line through its centre andthe centre of the cornea; the eye is nearly symmetricalabout this line. Within the sclerotic coat is a second opaque coat calledthe choroides, which has a circular…
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