The Physiological

Some part of the disc will appear to be deeper than the rest. This is the cup.

The cup is less than one third of the disc's diameter.

It is usually eccentric and is the point in the disc from which the arteries arise and the veins enter. There may be pearly white fibers, the lamina cribrosa, making a crosshatched appearance on the floor of the cup. It is im portant for you to learn the size of the physiological cup relative to the disc and the depth of the cup in those with normal vision (see the section on "Glaucoma" in Chapter 2).

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