The Collaborative International Dictionary of English v.0.48:

Ophthalmologist \Oph`thal*mol"o*gist\, n.
   One skilled in ophthalmology; an oculist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ophthalmologist
    n 1: a medical doctor specializing in the diagnosis and
         treatment of diseases of the eye [syn: ophthalmologist,
         eye doctor, oculist]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "ophthalmologist":
   anesthesiologist, cardiologist, chiropodist, dermatologist,
   eye doctor, eye-ear-nose-throat specialist, geriatrician,
   gerontologist, gynecologist, immunologist, internist, microscopist,
   neurologist, obstetrician, oculist, optician, optometrist,
   orthopedist, otolaryngologist, otologist, pathologist,
   pediatrician, pediatrist, podiatrist, psychiatrist, radiologist,
   serologist, skin man, specialist, telescopist