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What is the difference between mydriasis and meiosis?

Published in Eye Anatomy and Function 1 min read

Mydriasis and miosis are opposites relating to pupil size: mydriasis is the dilation (enlargement) of the pupil, while miosis is the constriction (narrowing) of the pupil.

Here's a breakdown of the key differences:

Mydriasis vs. Miosis

Feature Mydriasis Miosis
Pupil Size Dilation (enlargement) Constriction (narrowing)
Ancient Greek Origin (Not specified in provided reference) μύειν (múein) 'to close the eyes'
Definition The dilation of the pupil (as stated in the reference). Excessive constriction of the pupil (as stated in the reference).

Understanding Anisocoria

The reference also mentions anisocoria. It is important to note that anisocoria is the condition where one pupil is more dilated than the other. This is a difference in pupil size between the eyes, where either one is more dilated than the other. This condition may or may not be clinically significant.

Examples of Conditions

  • Mydriasis: Can be caused by medications, eye drops, recreational drugs, or certain medical conditions such as a traumatic brain injury.
  • Miosis: Can be caused by medications (like opioids), nerve damage, or exposure to certain toxins.