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mydriasis


Term: mydriasis
Literally meaning: “process to be a red hot mass ”
Origin: Anc Greek
μυδρίασις/mydriasis(=excessive enlargement of the pupil) > μύδρος>mydros(=red hot mass  or rock fragments that are ejected violently from a volcano crater)
Coined/History 
 The use of the word is attributed to Greek physician Galen of Pergamon (130–200 AD) but Hippocrates (460BC-ca.370BC) is said to have used a cautery tool (mydros) as an instrument to cause pupil dilation because of fear.
Definition
Mydriasis is the persistent and excessive dilation of the pupil (>6mm)  that does not return to normal state even under influence of light. Mydriasis is caused usually by use of certain drugs or trauma to the eye.  In addition , the ophthalmologist may induce mydriasis, using topical atropine in order to examine inner eye.  

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