Do you know that you can check whether or not your eyes are problematic by shining a bit of light on them?
You obviously don't like, blast a mega bright lightbulb upon it la. You might be momentarily blinded by the way. Simply stare at... Say... Your dimmest light at home. So long as it's capable of producing a bright speck on your eyes. (refer to picture above)
Then take a picture of it/Ask someone to help you check. The specks of lights are supposed to be at the same position on both eyes. For instance, the above picture right, the speck of light is in the top middle of BOTH my eyes.
If you have a problematic eye (I don't know, cataracts or something?) you should see the lights in different positions. E.g: Left eye has a white speck at the bottom, right eye has a white speck on top. Y'know what I mean, right?
P.S: Actually you should have difficulty seeing if you really have a problem, so there's really no need to conduct the test. Aiya, useless information sorry. (=.=)
I ANYHOW PLACE MY HANDS ONE, WAS QUITE AMAZED WHEN IT SHOWED ONLY MY EYES, SO COOL.