Should i be concerned if my vision prescription is -5.25. what does that stand for when you normally say/see 20/20. does that mean 20/525?

Presciption number: Those are two different things, like how much you weigh compared to how fast you can run. Your glasses or contact lens presciption is measured in units called diopters. It is the power of the lens (how curved it is) required to correct your vision back to normal clarity, which is seeing at 20 feet what other normal balanced eyes can see at 20 feet.