Anisocoria
Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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| Anisocoria | |
|---|---|
| Synonyms | N/A |
| Pronounce | N/A |
| Specialty | N/A |
| Symptoms | Unequal pupil sizes |
| Complications | May indicate serious underlying conditions |
| Onset | Can be sudden or gradual |
| Duration | Varies depending on cause |
| Types | N/A |
| Causes | Physiological anisocoria, Horner's syndrome, Adie syndrome, Third nerve palsy, Trauma, Medication |
| Risks | Head injury, Stroke, Brain tumor, Aneurysm |
| Diagnosis | Physical examination, Neurological examination, Imaging studies |
| Differential diagnosis | Horner's syndrome, Adie syndrome, Third nerve palsy |
| Prevention | N/A |
| Treatment | Depends on underlying cause |
| Medication | N/A |
| Prognosis | Varies; benign in physiological cases, serious if due to neurological causes |
| Frequency | Common (physiological anisocoria) |
| Deaths | N/A |
Anisocoria is a condition characterized by an unequal size of the pupils. It is a common condition, occurring in approximately 20% of the population. Anisocoria can be a benign finding or a sign of more serious medical conditions.
Causes[edit]
Anisocoria can result from a variety of causes, which can be broadly categorized into physiological and pathological causes.
Physiological Anisocoria[edit]
Physiological anisocoria is a benign condition where the difference in pupil size is usually less than 1 mm and does not change with different lighting conditions. It is often idiopathic and does not require treatment.
Pathological Anisocoria[edit]
Pathological anisocoria can be due to:
- Horner's syndrome: A condition caused by disruption of the sympathetic nerves supplying the eye, leading to ptosis, miosis, and anhidrosis.
- Adie's tonic pupil: A neurological disorder where one pupil is larger than normal and reacts slowly to light.
- Third nerve palsy: A condition affecting the third cranial nerve, leading to ptosis, "down and out" eye position, and pupil dilation.
- Iritis or uveitis: Inflammation of the iris or uveal tract can cause anisocoria due to irregular pupil shape or size.
- Pharmacological agents: Certain medications or drugs can cause anisocoria by affecting the muscles of the iris.
Diagnosis[edit]
The diagnosis of anisocoria involves a thorough medical history and physical examination. Key steps include:
- Observation in different lighting conditions: To determine if the anisocoria is more pronounced in bright or dim light.
- Slit-lamp examination: To assess the anterior segment of the eye for any abnormalities.
- Neurological examination: To check for any associated neurological signs that might indicate a more serious underlying condition.
Treatment[edit]
Treatment of anisocoria depends on the underlying cause. Physiological anisocoria does not require treatment. Pathological anisocoria requires addressing the underlying condition, which may involve:
- Medications: For conditions like uveitis or iritis.
- Surgery: In cases of structural abnormalities or tumors.
- Observation: In cases where the cause is benign and self-limiting.
