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The vitreous humor and crystalline lens of the eyeball magnified, with the stains of the pigmentum nigrum left by the ciliary processes.

Section of the Eye

The vitreous humor and crystalline lens of the eyeball magnified, with the stains of the pigmentum nigrum…

Section of the eye magnified, showing the crystalline lens in its proper situation, between the aqueous and vitreous humors.

Section of the Eye

Section of the eye magnified, showing the crystalline lens in its proper situation, between the aqueous…

The crystalline lens, hardened and divided.

Crystalline Lens

The crystalline lens, hardened and divided.

A convex lens, bends the ray of light which pass through it, so that they meet at a point called a focus. The crystalline lens converges the rays of light which enter the eye, and brings them to a focus on the retina. The healthy lens has a power of changing its convexity so as to adapt itself to near and to distant objects.

The Use of the Crystalline Lens

A convex lens, bends the ray of light which pass through it, so that they meet at a point called a focus.…

A diagram showing how an image is formed upon the retina by the crystalline lens.

A Diagram of the Retina and Crystalline Lens

A diagram showing how an image is formed upon the retina by the crystalline lens.