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What Is the Diagnostic and Statistical Manual of Mental Disorders

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What is the Diagnostic and Statistical Manual of Mental Disorders? Why is it needed and how is it used?


Definitions:

Dichromatic Vision

A form of color vision deficiency where a person can perceive only two of the three basic colors.

Afterimages

Visual illusions that occur after looking at an object intensely and then seeing its complement or a faint copy elsewhere.

Ganglion Axons

Refers to the nerve fibers originating from a ganglion, which is a collection of neuron cell bodies, conveying information in the nervous system.

Optic Nerve

A nerve located in the skull that is essential for transferring visual signals from the retina to the brain.

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