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Hello and thanks for your question.
Is this an observation that you are making about your eyes after you've looked at them in the mirror? Is this an observation that other people are making?
Or did you see an eye doctor who told you that you have one eye bigger than the other, after having measured the eyes?
There are a few things that can cause one eye to appear bigger than the other.
First, the eyes can actually be different sizes. Usually the eyes are not exactly the same size, but the differences are small enough that this could not be distinguished by the naked eye. There can rarely be very large differences in the sizes of the eye, such as one eye that is very much larger, but this is a condition that usually has been there since birth so that would not be part of this equation.
Second, the eyelids of one eye can be retracted and therefore you see more whites of the eyes one the retracted side than on the other side. This can give the appearance of that eye being bigger than the other. This is very common in people who have thyroid disease. In addition, in thyroid patients, the tissues behind the eye can get bigger and cause the eyeball to be pushed out of its socket, also giving rise to the appearance of a bigger eye. If you have symptoms consistent with thyroid dysfunction, then this should be an obvious place to start looking.
Lastly, if one eye's eyelids are droopier than another; if your eyelid on one side is starting to droop compared to what it used to look like, this can make this eye seem smaller and therefore the other eye seem larger in comparison.
Does this make sense and does this help address your concerns?
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If the left eye is the eye that has the smaller eye appearance and the droopier eyelid, then it is possible that this eyelid muscle was damaged at that time and has progressively lost some of its function. If that is the case and that is the only reason for the asymmetric appearance between the two eyes, then surgery will help you look more asymmetric by fixing that droopy eyelid. But I do think it's important to make sure that the other, larger appearing eye, is not that way because of thyroid problems. Even if the droopy eyelid is not causing this asymmetric appearance, surgery can still likely help the appearance of that eyelid and probably help you look more like you used to.
I hope that's been helpful.
Okay, so it's not likely that the eyelid muscle was damaged by that hit if that eye appears larger, but the thyroid thing is a good thing to look into and, yes, fixing that droopy eyelid is certainly a possibility. Your eye doctor should be able to get that ball rolling. I hope that's helped.
Good luck to you!