One Eye Bigger Than the Other

Having different eye size might be a noticeable feature that recommends one’s health condition. And some people may would like to know if the condition has to be fixed or dealt with. The response might depend upon the causes of this symptom.

Having different eye sizes may be a noticeable function that can lead one to question if something is wrong with his health. Still, other people might want to know if one needs to have a different eye size fixed or dealt with. The answer may depend on what is the possible cause of having one eye bigger than the other.

Causes of One Eye Bigger Than the Other

Ptosis or Droopy Eyelid

A droopy eyelid might be a normal variation in an individual or it may be because of a disorder such as a nerve problem, an eye infection (like a stye), an allergic reaction, migraine headaches, or an autoimmune condition called myasthenia gravis. It can be genetic or might establish later in life due to aging.

Treatment. You should seek medical help if the drooping of one or both eyelids is triggering issues in vision, if it is progressively worsening, or it is connected with other symptoms.


In some people, there might be normal variations in the sizes of the pupils at birth, which the variation variety may be from 0.5 to 1 mm. This symptom might likewise occur to people who have equal student size occasionally. Anisocoria may signify a disorder in the eye, nerve, blood vessel, or brain.

Treatment. If this symptom happens briefly for people with equal student size with no other symptoms, there is no need to fret. If there is an accompanying symptom such as changes in vision, queasiness and vomiting, fever, or headache, or it takes place after a head injury, look for instant medical assistance.


Amblyopia arises from abnormal development of vision during infancy or early youth, leading one or both eyes to wander outside or inward, so that they do not appear to collaborate. It might cause one eye to appear to have a different size. It is generally associated with bad visual acuity and depth perception.

one eye bigger than the other

Treatment. If you notice that your child might have a wandering or lazy eye, have his eyes examined by an ophthalmologist. Amblyopia can result in mild to severe vision loss, and it should be dealt with instantly.


Some people have one eye bulging, triggering it to look bigger than the other, while others may have both of their eyes bulging. This condition, called exophthalmos, is generally due to a medical condition such as a tumor behind the eye or a hyper thyroid. Often eye bulging might be challenging to notice because it happens very gradually and can only be detected through pictures taken at different times.

Treatment. When an eye seems bulging, specifically in a child, medical assessment should be done because it may signify a severe disease.


Having crossed eyes or strabismus is common amongst infants, although it can likewise be found amongst adults. It is a condition where one can not align the eyes simultaneously, such that one or both eyes turn inward, outward, upward or downward. Eye turning might be intermittent or constant. Symptoms of crossed eyes consist of uncoordinated eye motions, double vision and reduced vision in one eye.

Treatment. To eliminate the symptoms, you can use a patch over one eye, do visual exercises, use eye drops, or wear glasses to help in proper focusing. Some people might require corrective surgery if the condition persists.

Grave’s (Thyroid) Disease

Tomb’s disease is triggered by overactive thyroid gland. Early eye symptoms are dry or watering eyes and a gritty sensation. The eyes might end up being sore, red, and swollen and the eyelids may become withdrawed into the back of the eyeballs, making the eyes appear unequal in size. Patients may appear to have protruding eyes with long-term gaze, and in innovative cases, they may experience double or minimized vision. The swelling can often continue the optic nerve behind the eye, cause pain, and affect one’s vision which can lead to blindness.

Treatment. Look for consultation with your doctor about the treatment of overactive thyroid. To care for bulging eyes, you can apply artificial tear drops to relieve dry eyes. At night, you can assist close the eyelids using eye pads and eye ointment.

Reyus Mammadli (Eyexan Team Leader) / author of the article
Bachelor in biomedical and electrical apparatus and systems. For more than 20 years he has been studying methods to improve health using affordable and safe methods. Collaborates with eye care charity organization of the CCP. Specialization is a vision correction by laser surgery, including LASIK.
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Ophthalmology: Health of Your Eyes
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