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.