Concerns about cataract symptoms

There are no symptoms of cataracts, but a white membrane-like substance is covering the pupil.

So I went to the hospital, and they said it's okay if there are no other symptoms... But since this week is about cataracts, I'm worried... It could progress to a cataract at any time, and I feel like a white membrane is covering the back of my eye... Is there anyone experiencing symptoms like mine?