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I've got something weird going on with my eyes where even if I have my contact lenses in I'm not able to see as my eyes start working independently of each other and I get double vision. The opticians I've spoken to have no idea why it happens. After I get out of the pool I have double vision for about an hour, even if I put my glasses on immediately.
It's why I will (never again) drive to a swimming pool, just too dangerous trying to drive home...
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If you're wearing normal goggles have you tried the bigger mask style goggles like http://www.wiggle.co.uk/aqua-sphere-womens-seal-xp-clear-lens-goggles/ that don't put any pressure on the eye muscles?
I used to do that, and I can't wear contact lenses so I went for:-
http://www.optilabs.com/site/prods.php?pfid=0,8,24,25
£52 if your prescription is close enough to any of their "ready made" lenses.
£90 if not (I have these as I have bolloxed eyes)
They make a world of difference to my swimming. I could swim without them but I'd be unable to read the big clock on the wall which would be annoying for training.
With them I can easily tell if that's a chunk of hair on the bottom of the pool or something even more disgusting.