found this on the dep site:

** Issuance of a free license to the blind or mentally retarded requires proof of disability in the form of a certificate provided by any person licensed to practice medicine in this state.

*** Any resident with the loss of a limb or the loss of the use of a limb and a doctor’s certificate may be issued a free license. Qualified nonresidents who are residents of states which allow CT residents the same privileges are also eligible