Mydriasis
Mydriasis
Mydriasis (/maɪˈdraɪ.əsɪs/) is a medical term that refers to the dilation of the pupil of the eye, usually as a result of disease, trauma, or the use of drugs.
Etymology
The term "mydriasis" comes from the Greek word "mydrias," which means "to widen." It was first used in medical literature in the 17th century.
Causes
Mydriasis can be caused by a variety of factors, including:
- Sympathomimetic drugs, such as amphetamines and cocaine
- Anticholinergic drugs, such as atropine and scopolamine
- Damage to the iris or optic nerve
- Brain injury or brain tumor
- Adie's pupil, a neurological condition that affects the pupil of the eye
Symptoms
The primary symptom of mydriasis is an abnormally large pupil. This can cause problems with vision, such as blurred vision, light sensitivity, and difficulty focusing on close objects.
Treatment
Treatment for mydriasis depends on the underlying cause. If the condition is caused by a drug, discontinuing the drug may resolve the symptoms. If it is caused by a disease or injury, treatment may involve medication or surgery.
Related Terms
- Miosis, the constriction of the pupil
- Anisocoria, a condition in which the two pupils are different sizes
- Photophobia, a sensitivity to light
External links
- Medical encyclopedia article on Mydriasis
- Wikipedia's article - Mydriasis
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