There is no particular set of medical tests to go through before the cryo surgery. The tests will depend on your current diagnosis and medical condition.
Other than these, you may have to go through some other tests recommended by your ophthalmologist. Even though the cryo surgery is not extremely complex and can be completed in under 10-15 minutes, all the precautions are necessary to ensure that there are zero complexities during the process for both the doctor and the patient.