Why would a patient need spectacles if they wear contact lenses?

If you are a contact lens wearer it is almost essential that you also have a pair of spectacles as a back up. If there is any reason you cannot wear your lenses, such as an infection, then you will need to have a pair of spectacles to do your daily tasks, such as driving. Most contact lens wearers will also have spectacles and in some European countries it is illegal to not have a back up pair of spectacles in your car (but not in the UK at present). If you cannot wear your lenses and have a complicated prescription you may have to wait longer for your spectacles to be made, meaning you have nothing that will correct your vision for a period of time.