One Eye Bigger Than Other – Causes and Treatment

Different eye sizes may lead one to wonder if something is wrong with him. But, it is not unusual to have one eye bigger than other. This condition may be caused by many different factors, which we will discuss in this article.

Also, we will tell you how to resolve this problem and how to improve asymmetric eyes.


Natural Asymmetry. One of the most common reasons of having one eye bigger than other is a natural asymmetry of the eyes. Many people have asymmetrical eyes that are different in shape and size. One eye may be narrower from the other while the other eye is more rounded. If you also have asymmetrical eyes, you don’t have to worry. This condition is absolutely normal. Your eyes may also appear asymmetrical if you are tired or dehydrated, so it is recommended to drink a lot of fluids.

Droopy Eyelid. Some people may have a droopy eyelid naturally, but in some cases it may be caused by migraines, eye infections, nerve issues, allergic reactions and other factors. In some cases a droopy eyelid may be present at birth or caused later by aging. Whatever is the cause, if you have a droopy eyelid you will probably have one eye bigger than other.

Amblyopia. Amblyopia is a condition that usually happens in the early childhood and it may cause one eye to be bigger than other. In this case one or both eyes will move inward or outward, which will lead to impaired vision and you will have one eye that is bigger than other.

Anisocoris. Some people are born with pupils that are different in size, while others experience this condition later. Their pupils may vary in size, so one pupil may become bigger than another. It may be caused by a disorder to the eyes, brain, blood vessels or nerves.

Exophthalmos. This is a condition that happens when someone’s eyes are bulging, which is usually caused by hyperactive thyroid or a tumor that is growing behind one’s eyes. Exophthalmos is a condition that progresses slowly so it will be hard to notice this health problem.

Strabismus. Strabismus is also one of the potential causes of having one eye bigger than other. This condition is also called ”crossed eyes”. It usually happens in babies, but sometimes it also occurs in adults. Each eye may turn inward, outward, downward or upward independently. This condition may also cause some other symptoms, such as double vision or impaired vision.

Grave’s Diseases. Grave’s disease is a condition that makes you seem as you have one eye bigger than other because of the swelling. Actually, Grave’s disease caused by an overactive thyroid gland may lead to swelling of the eyes, as well as watering, redness and a gritty feeling. Apart from these symptoms, patients may also experience double or reduced vision. Sometimes the swelling may press on the optic nerve behind the eye, which will cause pain and it may also result in blindness.


If you have eyes that are naturally asymmetrical, you can use a few simple techniques with makeup. You can simply use a golden color-based shadow around your eyes and then use a highlighter in order to lightly smudge toward the eye corner.

Also, you should use eyeliner on the smaller eye, so that your eye may appear thicker. It is also good to use mascaras which will lengthen your lashes and make your smaller eye to look bigger.

There’s no need to worry in the case if one pupil is slightly bigger than another. But, if there are also other symptoms including headache, fever, vision changes, vomiting or nausea, it is necessary to seek medical help as soon as possible.

If your child suffers from amblyopia, it is necessary to take him to the ophthalmologist because if not treated on time, this condition may lead to severe loss of vision. If you notice that one eye is bigger than other because your eye is bulging, then it is also necessary to seek a medical help. In the case of a Grave’s disease you will need medical assistance to treat an overactive thyroid.

In the case of strabismus, it is recommended to use eye drops or to wear glasses. Also, you should carry out visual exercises, but in some serious cases people will require a surgery.

If you have one eye bigger than other, it is also recommended to do basic eye exercises, such as rolling the eyes sideways, upwards or downwards. These exercises may also help you strengthen your extra-ocular muscles.


As you have seen, many people suffer from the condition where one eye is bigger than other.

As we have already said, there are different causes for this condition, such as natural asymmetry, droopy eyelid, amblyopia, anisocoris, strabismus, etc. If you also have one eye bigger than other, you don’t have to worry and you can easily resolve this problem. You can use eye drops or you can do some eye exercises.

Also, a good makeup can help you create an illusion of symmetrical eyes. But, there are also cases when you need to seek medical help, in order to avoid any complications. If you don’t treat this condition properly, it may lead to complete blindness, so be careful. If you notice that you have asymmetrical eyes, it is always best to consult your ophthalmologist.