After you fill out the application form, you will need to send them a copy of your educational documents (leaving certificate from highschool / or equivilant)
After that they will send you a form that will have to be filled out by an eye specialist and this will have to be send back to them.
Once all that is in order, the will email you again to tell you that you have been successful/ unsuccessful and that you will hear from them shortly.
It's a long process but I would advise you to get everything back to them as quickly as possible so as to make sure you wont have to wait any longer.
I hope this helps