Hi Piglett.
DD3 had her eyes tested at under a year old due to referral as family history of squints. her basic eyecheck was a bit 'well not sure' really, but she was referred for a special new eye check involving a fancy new camera, which pciked up she was long sighted. A follow up appointment 6months later (the camera test meant a big waiting list as lots of little ones got referred) revealed that dd3 was extremely longsighted and her perscription is +7.5 and +9. She was 18months old.
She then developed a squint in her right eye last year, and we have had to do patching as well, but her glasses have helped a lot.
It is a bit of a shock, but dh and I both wear glasses although didnt need them until our early-mid twenties, (we are now late 20's) so it is a little easier.
Do be warned though, you will spend a lot of time getting glasses repaired, or trying to find them everyday. dd3 once hid hers in the sandpit and they came out very scratched.
i can recommend the kids sports band coupled with the curly-ended specs to start with to help keep the glasses on. After a while they do learn that they can see better with glasses on.
DD3 now puts her glasses on as she wakes up, and i have to remove them once she drifts off to sleep as she doesnt like being without them even when fallings asleep.