| Term | Definition |
| Eustachian Tubes | help drain ears and regulate the pressure in the ear |
| Vertigo | whirling, dizziness, or loss of balance often accompanied by nausea or vomiting |
| Presbycussis | progressive nerve deafness associated with aging |
| Tinnitus | ringing or buzzing sound in one or both ears |
| Acoustic Nerves | connected to the cochlea to pass electrical signals |
| cochlea | collects sound waves and transmit vibrations to electrical impulses |
| Tarsorrhaphy | suturing together the upper and lower eyelids to protect the eye when the lids are paralyzed or unable to close properly |
| Conjunctivitis | inflammation of the conjunctive usually caused by an allergy or infection |
| Dacryoadenitis | Inflammation of the lacrimal gland due to bacterial, viral or fungal infections |
| Equilibrium | balance |
| AD (auris dexter) | right ear |
| AS (auris sinister) | left ear |
| AU (auris uterque) | both ears |
| Amblyopia | dimness of vision or partial loss of sight, usually one eye, without any detectable diseases |
| Auditory Ossicles | tiny ear bones |
| Adnexa | accessory structures outside the eyeball such as orbit, eye muscles, eyelids, and eyelashes |
| OU (oculus uterque) | both eyes |
| OS (oculus sinister) | left eye |
| OD (oculus dexter) | right eye |
| tympan/o | tympanic membrane/ eardrum |
| trop/o | turn, change |
| scler/o | sclera, white of eye, hard |
| presby/o | old age |
| -opia | vision condition |
| ophthalm/o | eye, vision |
| myring/o | tympanic membrane/ eardrum |
| kerat/o | horny, hard, cornea |
| -cusis | hearing |
| blephar/o | eyelid |
| labrinth/o | inner ear |
| pinn/i | outer ear |
| retin/o | retina |
| phac/o, phak/o | lens |
| ir/i, ir/o, irid/o, irit/o | iris |
| Strabismus | the eyes pointing in different directions due to the ocular muscle not being able tofocus together |
| Presbyopia | common changes in the eyes that occur with aging |
| Nystagmus | involuntary, constant, rhythmic movement of the eye |
| Myopia | A defect in which light rays focus in front of the retina (nearsightedness) |
| Hyperopia | a defect in which light rays focus beyond the retina (farsightedness) |
| Hemianopia | blindness of one half of the field of vision |
| Exotropia | outward deviation of one or both eyes |
| Esotropia | inward deviation of one or both eyes (cross-eyed) |
| Diplopia | perception of two images of a single object (double vision) |
| Astigmatism | the eye does not focus properly due to an uneven curvature of the cornea |
| acous/o, acoust/o, audit/o, ot/o | ears |
| dacryocst/o, larim/o | lacrimal apparatus |
| opt/i, opt/o, optic/o, ophthalm/o | eyes |
