When I did the class 1 in Ireland I don't recall them checking my eyes to that degree, I did a colour chart test and a distance test but it seemed straight forward.
Usually when someone goes to a doctor for anything they always get a second opinion particularly if it is something serious, my point being this, I'm just wondering if you should maybe book to do the class one here in Ireland or another centre, don't tell them you failed it the first time and see if they pick up on the eye problem. O.K. it's gonna cost you some more cash but you may get lucky and find that they miss it or deem it as not serious enough to fail you.