It's for me too. One of my eyes in 20/40 the other is 20/20. And that's with my glasses ON so I probably need new ones. And yes i think it's normal. It's not rare..
Ohhh you said brighter... Sorry that i misunderstood. But i don't think there's anything wrong with seeing brighter in one eye.
How MUCH brighter do you see with the other eye? Is it very noticeable? Do you have any other signs or symptoms of vision problems?
Seeing things very slightly brighter in one eye than the other can just be a normal variation between your two eyes, as pairs of things on our body are rarely perfectly equal.
However, there are many eye diseases that can cause one eye to start seeing worse than the other, whether you notice one eye is blurrier or one eye is less bright or one eye sees colors different. So if this is a significant different between your two eyes that has seems to come on in recent years, I highly suggest that you get a complete eye exam with an optometrist (eye doctor) to make sure you don't have anything gonig on back there.
Chances are, it's just a normal variation, but again if it is a large difference between the eyes you better get it checked out just in case.