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.

Lens

Structure in the eye which functions to transmit and focus incoming light rays directly on the retina; this is facilitated by accommodation - the subtle change in lens shape brought about by contraction and relaxation of the ciliary body; the accommodative ability of the lens is limited in domestic species.
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