The Collaborative International Dictionary of English v.0.48:

Myotic \My*ot"ic\, a. [See Myosis.] (Med.)
   Producing myosis, or contraction of the pupil of the eye, as
   opium, calabar bean, etc. -- n. A myotic agent.
   [1913 Webster]

WordNet (r) 3.0 (2006):

myotic
    adj 1: of or relating to or causing constriction of the pupil of
           the eye; "a miotic drug" [syn: miotic, myotic]
    n 1: a drug that causes miosis (constriction of the pupil of the
         eye) [syn: miotic drug, myotic drug, miotic,
         myotic]