oph·thal·mol·o·gy 
(ŏf′thəl-mŏlə-jē, -thăl-, ŏp′-)
(ŏf′thəl-mŏlə-jē, -thăl-, ŏp′-)n.
The branch of medicine that deals with the diagnosis and treatment of diseases and disorders of the eye.
oph·thal′mo·logic (-thăl′mə-lŏjĭk), oph·thal′mo·logi·cal (-ĭ-kəl) adj.
oph·thal′mo·logi·cal·ly adv.