| Optometrist | practitioner who recognizes and diagnose eye diseases |
| Opthalmologist | a doctor who specializes in eye care (including surgery) |
| -opia, -opthalm, -ocul | word roots referring to eyes or vision |
| Fibrous tunic | outermost layer of the eye |
| Vascular tunic | middle layer of the eye |
| Nervous tunic | inner layer of the eye |
| Fibrous tunic | eye tunic that include the cornea and sclera |
| Sclera | the "white of the eyes" |
| Cornea | the clear portion of the fibrous tunic |
| Vascular tunic | eye tunic that include the iris, ciliary body, and choroid |
| Ciliary body | structure that changes the lens shape |
| Optician | practitioner who dispenses corrective lenses |
| Iris | part of the eye that determines eye color |
| Choroid | part of the eye that nourishes the vascular tunic |
| Ciliary body | produces aqueous humor |
| Iris | controls the diameter of the pupil |
| Pupil | hole that allows light to enter the eye |
| Retina | contains the rod and cones |
| Rods | responsible for black and white vision |
| Cones | responsible for color vision |
| Fovea centralis | where light is focused onto the retina |
| Optic disc | the blind spot of the eye |
| Optic nerve | takes sensory info from eyes to brain |
| Occipital lobe | part of brain that interprets sensory info from eyes |
| Aqueous humor | substance that fills the anterior eye chamber |
| Vitreous humor | substance that fills the posterior eye chamber |
| Conjunctiva | tissue that lines the front of the eye and inside the eyelid |
| Lacrimal gland | gland that produces tears |
| Nasolacrimal duct | structure that drains tears into the nose |
