I'm wearing my reading glasses right now (they're -2.00 and -1.25).
I can see my laptop clearly (which makes a change). If I take them off, I cannot read the screen text on 125% and the time and date on the menu bar is a white smudge. It is just readable if I hold it up with the laptop resting against my collarbone. The TV is 32" about about 6 foot away. The screen is a blur.
To read text further away than 4 inches from my nose without glasses, it has to be blown up to 14 point or photocopied to 144%/A3 size. I cannot read 12pt text at normal reading distance.
I managed as a child until I was 11 because my table was right in front of the board. I never caught a ball or learned to do high jump because I couldn't see the equipment. I couldn't run in a straight line or balance/spin because I couldn't find a spot to focus on. At home, the chair I sat in was less than five foot from the TV because it was the only one that didn't have somebody else in it. I used to fall off my bike and once rode straight into the kerb and fell against a lamp post because I didn't see where it was and ran out of road - it was assumed I was just rubbish at it, not that I couldn't see grey kerb on grey road and grey lamp post on grey pavement.
All with a prescription that turned out to be -1.25 and -1.50 when the visiting nurse/eye test at school picked it up. I also had daily headaches that I was prescribed adult strength painkillers for, but nobody had thought I should have my eyes tested, not even the doctor who prescribed me first Brufen 400 x 2 aged 9 and then Paramol and Paramax aged 11 (I refused to have Paramol after the first couple of prescriptions because it made me feel sick). To have the whole world swim up in bright, clear focus for the first time was alarming and made me feel dizzy.
Of course, once they broke, my mother refused to get any more because glasses 'cost money', so I had to go another two years without any, so I went back to the old method of sticking close to the board, being crap at PE and getting poleaxed by headaches. I only nearly got myself killed crossing the road once, though. I listened to things a lot - more carefully after that.
As soon as I had glasses, I could do so many things I'd never thought I'd be able to - and that's for a far weaker prescription than yours.