A great way to protect your business and clients are consent forms. They are a great resource to make sure your client is a good candidate for extensions. Consent forms also will reassure your client has had no issues with their eyes in the past, and help you keep track of your clients mapping, retention. etc 

This consent form is completely free and available for download as soon as purchase is received just make sure to enter a valid email to send link. Consent forms can be downloaded and edited to best fit your business