Veterinary Drug Handbook (VDH) is the reference veterinarians turn to when they want an independent source of information on the drugs that are used in veterinary medicine today.

Retina

The rear interior surface of the eyeball is called the retina. The retina contains nerve cells referred to as rods and cones. The rods are sensitive to light and the cones to color. The retina receives the light and color and converts them into nerve impulses which go to the brain.

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