Sorry Sarah, information on cryptorchids is not recorded anywhere officially although some breeders might keep private records of the number born in their litters.
Eye test results are published quarterly in the Kennel Club Breed Record Supplements & annually in the Cocker Club Welfare Reports. The Cocker Club may have some old welfare reports available - I'm not sure. The Kennel Club can I think supply a list of dogs that have been eye-tested but not sure how far back it would go & you would have to pay for the service. Do you have an idea of how far back you want results for? I have copies of Welfare Reports going back a number of years & Breed Record Supplements going back to the 80's so if I can help, let me know
Jane