Unfortunately, not always. Meanwhile, potentially serious damage can result. Never, wear a contact lens that is damaged or if you suspect a problem. Remove lenses if your eyes become red or if your vision is not as clear as it was. But I've ordered lenses over the phone for mail delivery and they didn't even ask for a written prescription.
Some people do manage to find ways to get lenses without a prescription.
People hack into computer networks, too. CyberLens simply will not participate in unethical behaviors or practices that puts our clients at risk. If you don't have a prescription, don't look here for lenses. My doctor will not give me my prescription. The law requiring release of contact lens prescriptions varies from state to state.