Anisocoria, different pupil sizes: what is this, causes, symptoms, diagnostics, treatment, prevention

Anisocoria; Enlargement of one pupil; Pupils of different size; Eyes/pupils different size

Anisocoria is a symptom, in which one pupil is larger than the other. This is a common condition, which can be caused by various factors. In most cases, it is benign and does not cause serious problems.. However, in some cases it may be a sign of a more serious underlying condition..

Causes of anisocoria

There are many potential causes of anisocoria. Some of the most common include:

• Irritation or inflammation of the iris (colored part of the eye)
• Eye or head injury
• Some medications, such as some antidepressants and anti-anxiety drugs
• Neurological diseases, such as Horner's syndrome or Adie's syndrome.
• Eye diseases, such as glaucoma or cataracts

Symptoms of anisocoria

The main symptom of anisocoria is uneven pupil size.. The affected pupil may be larger or smaller than the other pupil.. Other symptoms may include:

• Blurred vision
• Double vision
• Headache
• Nausea
• Fatigue

Diagnosis of anisocoria

Anisocoria is usually diagnosed during a routine eye exam.. Your eye doctor will examine your pupils and may do additional tests, to determine the cause of the condition. These tests may include:

• Visual field test, which checks for blind spots in your vision.
• Pupillary light reflex test, which checks the reaction of your pupils to light.
• Tonometric test, which measures intraocular pressure.
• CT or MRI, which can help identify any underlying neurological disease.

Treatment of anisocoria

Treatment for anisocoria will depend on the underlying cause. In most cases, treatment is not required. If the condition is caused by injury or inflammation, it usually goes away on its own. If anisocoria is caused by a drug, your doctor may suggest switching to another medication. If it is caused by a neurological disease, your doctor may refer you to a neurologist for further evaluation and treatment.

Prevention of anisocoria

There is no specific way to prevent anisocoria. Nonetheless, you can reduce your risk of developing the disease, doing the following:

• Wearing safety glasses when playing sports or other activities, which can cause eye injury.
• Notifying your eye doctor of any change in your vision or any new symptoms
• Regular eye exams to detect and treat any underlying conditions

In conclusion, anisocoria is a condition, in which one pupil is larger than the other. This can be caused by various factors, and in most cases it is a benign disease. Nonetheless, it is important to tell your eye doctor about any changes in your vision or any new symptoms, as well as regular eye examinations to detect and treat any underlying conditions.

Used literature and sources

Balcer JL. Pupillary disorders. In: Liu GT, Volpe NJ, Galetta SL, eds. Liu, Volpe, and Galetta’s Neuro-Ophthalmology. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 13.

Cheng KP. Ophthalmology. In: Kids BJ, McIntire SC, Nowalk AJ, eds. Zitelli and Davis’ Atlas of Pediatric Physical Diagnosis. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 20.

Thurtell MJ, Rucker JC. Pupillary and eyelid abnormalities. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff’s Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 17.