Ophthalmo is defined as for or related to the eyes.
An example of ophthalmo is ophthalmoscope, which is an instrument used to examine the inside of an eye.
the eye or eyes: ophthalmoscope
also, before a vowel, ophthalm-
Origin of ophthalmo-; from Classical Greek ophthalmos, akin to ?ps, eye
Eye; eyeball: ophthalmoscope.
Origin of ophthalmo-Greek, from ophthalmos, eye; see okw- in Indo-European roots.