I have a medium prescription for short sightedness, so I can get relatively cheap glasses online. We've each got around five pairs - one on, one in the bedroom, one in each bathroom and a pair downstairs at all times.
If my glasses end up on the bedroom floor (normally because, without my glasses on, it's hard to see the bedside cabinet), I cannot see them to pick them up. I have to get on my hands and knees and feel for them like Velma in Scooby Doo
I would be unable to make a cup of tea without pouring boiling water all over the countertop/myself, I wouldn't be able to use a computer and wouldn't recognise my DP until he touched me and spoke. If I went outside, I'd probably fall over the garden wall, as I can't see the path. Which would be handy, as at least I wouldn't be crashing into passers by or squished by a car within the first five minutes.
The only time I am able to do anything without my glasses is in the pitch black - then, I can move around fairly easily because I'm not being distracted or confused by movement, light and blurs and am relying upon touch and sound. Which you can't do during the daytime.
Effectively, I am completely blind without glasses. I certainly wouldn't see a car coming and would have to rely upon the driver not being an utter prick who thinks their wish to drive and not wear glasses outweighs my right not to be killed by them being able to see me and stop when I inevitably fall over the first bump on the pavement/off the kerb because I can't see where it is.
I'd have to stay indoors, not cook, not drink, not do anything if I only had one pair and they were unwearable. For my own safety.
I think that the reason you are so 'clumsy' is that you can't fucking see. And your DP is quite justified in being pissed off (I wouldn't get into a car with a twat who needed glasses, either).