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Updated: June 29, 2025
In order that vision shall operate, says the author of a well-known book on Final Causes, "the sclerotic membrane must become transparent in one point of its surface, so as to enable luminous rays to pierce it;... the cornea must correspond exactly with the opening of the socket;... behind this transparent opening there must be refracting media;... there must be a retina at the extremity of the dark chamber;... perpendicular to the retina there must be an innumerable quantity of transparent cones permitting only the light directed in the line of their axes to reach the nervous membrane," etc. etc.
The first set converge from the circumference of the iris to the circular margin of the pupil, and constitute the radiated muscle. The outer ends of these fibers are attached to the sclerotic coat, which is unyielding; hence, when they contract, the pupil enlarges to receive more light.
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