It is a recognised fact that SBTs can suffer from eye problems therefore responsible breeders will only breed from bitches/dogs that are eye tested clear. I would suggest you visit the breed councils homepage for more info, and steer clear of people who say testing is not necessary or that their dogs have no problems - how do they know if they haven't been tested? A pup from eye-tested parents may not cost you any more than a pup that isn't but you have the assurance that the parents show no signs of genetic eye problems. Good luck!