What makes my one eye look bigger accompanied with pain?

Hello,

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The two common causes of such a presentation could be that either one of your eyes is either big in size or that the eyelids of your other eye have swollen up or one is pushed out or one eye has a squint, giving an apparent prominence of the other. Both causes are dangerous in that, they both can hamper your vision in several forms. Rare instances of life-threatening tumors are also reported, I have run into patients with such problems. Given that you have pain, I guess that it could be one of the latter causes. I recommend that you see an ophthalmologist for your issue. In case you need more help, please send me a picture of your eyes, pointing to where exactly it pains, I will do my best to help.