Myosis

The myosis characterizes a reduction in the diameter of the Pupille by contraction of the iris, contrary to the Mydriase.
This physiological reaction occurs with the light, and is reversible in the darkness. Physiologically, it is caused by the contraction of the annular muscles and ciliaires with an aim of supporting the accommodation.
The myosis is obtained by a stimulation of the autonomous Nervous system Parasympathique.
The myosis is also an side effect of certain substances, drugs or drugs by parasympatic activation of the receivers of the nervous system.

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