Because of what some babies have different pupils?


  1. What is the pupil
  2. Causes
  3. Treatment
  4. Conclusion

Different sizes of pupils in babies have a medical name – anisocoria. In itself, such a condition is not a disease, but only a visible symptom of other diseases.

If you notice such anomalies in your baby, then Only a doctor can determine the cause and prescribe treatment.

We’ll tell you why anisocoria occurs in infants and how to treat her.

What is the pupil

The pupil is a hole in the iris of the eye. All people the pupil is black only because it absorbs light the waves.

The pupil size varies depending on the light intensity: bright lighting makes the pupil narrow; fright, pain and darkness – increase pupil size. Main pupil function – control the number of light units entering eye.

Pupils of different sizes are often found in infants.

Unequal pupil size indicates inconsistent the work of two smooth muscles of the eye, constricting the pupil and radial muscle – contributing to its expansion.

The size of the pupils is regulated reflexively, if this is not happens – you need to look for the cause, since anisocoria is a symptom hidden pathology.


Such a pathology in infants is usually a consequence intrauterine development disorders or one of the symptoms acquired illness or injury.

If your baby suddenly has different pupils, vomiting is observed, and the baby is lethargic and moody – immediately see a doctor! The reason can be very serious:

  • A tumor or bruise of the brain;
  • Encephalitis;
  • Aneurysm of the vessels of the head.

If the violation of the coordination of the pupils became noticeable not immediately – the cause may be eye disease or a malfunction central nervous system.


Pupils of different sizes in infantsIn older age anisocoria develops amid serious disruptions central nervous system due to such negative processes, as:

  • Eyeball injury;
  • Aneurysm;
  • Benign and malignant tumors of the head brain
  • Encephalitis;
  • Meningitis;
  • Damage to the optic nerve or muscles;
  • Violation of cerebral circulation of various etiologies;
  • When using drugs containing narcotic substances.

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Symptoms of anisocoria may increase in light and testify to parasympathetic eye arousal but you should keep in mind that a slight difference in pupil size (up to 1 mm) – not a pathology.

If your family has immediate relatives a slight difference in the size of the pupils, then the manifestation of the same a symptom in a baby may just be genetic feature.

Confirm or refute this assumption can only highly qualified specialist.


Pupils of different sizes in infantsWe have already found out that anisocoria is not a disease in itself, and therefore therapy the patient will be referred to the underlying disease that caused impaired pupil coordination.

If the problem is muscle activity of the iris, apply drugs that stimulate proper muscle function.

If the cause of anisocoria is associated with neurological diseases – treatment will be directed to the maximum stabilization of the patient. After the disappearance of neurological pupil coordination problems will be restored.

There are situations when urgent medical intervention is not required – the doctor just watches the baby, and the anisocoria passes by her own.


Now you know that differences in pupil sizes can testify about the diseases of your crumbs or be just body feature. To make sure of this – refer to specialists: optometrist and neurologist, only they can, if necessary, prescribe treatment when a little different pupils in the baby.

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