It is hard to tell just based on your introduction. Even if seeing a doctor, you still have to provide more information as basis of diagnosis. Normally speaking, the two eyes we have are not completely same with each other. It is very common for two eyes in different conditions. If it is a sign of eye disorder, you might find out more information or symptoms. For example, conjunctivitis might occur to one eye or both. If you got conjunctiva infected in one eye, it is not as bright as the other healthy eye. It also develops redness, itching, teary and grittiness. So you should check carefully if there is any other symptom accompanied. Take an examination of eyes to see if anything wrong.