The law compels your eye doctor to write you a contact lens prescription at the end of the examination. However, there are exceptions to the rule. The doctor may refuse to issue you a prescription if s/he establishes that contact lenses would compromise the health of your eyes. If the doctor foresees potential harm to your eyes' health, s/he may refuse to write you a prescription. The law also allows them to withhold the prescription if you have not paid for the examination or have a debt. Further, if you request for a prescription after it has expired despite a two-month extension, the doctor has the right to refuse. However, the doctor needs to explain all the above to their patients. Note that a few rogue doctors exist who may refuse to write you a prescription so that you purchase the lenses from them, which is illegal.