| A | B |
|---|
| Eyelids | Act like windshild wipers, keep surface lubricated and free from dust and debris |
| Palpebral fissure | A gap that separates the free margins of the upper and lower eyelids |
| Lens | This focuses the visual image by changing shape |
| Cornea | Has numerous nerve endings, most sensitive portion of the eye, and transparent part of the outer fibrous layer of the eye |
| Lacrimal gland | Known as the tear gland |
| Limbus | The border between the cornea and sclera |
| Sclera | The white of the eye |
| Iris | Responsible for eye color and changing the shape of the pupil |
| Pupil | Central opening of the eye is known as this |
| Cones | Allow us to see color |
| Rods | These are very light sensitive and enable us to see in dimly lit rooms |
| Neural tunic | This layer of the eye contains the retina, rods and cones |
| Fibrous tunic | This layer of the eye contains the sclera and cornea, attachment site for extrinsic eye muscles and provides some protection |
| Tears | These reduce the friction in the eye, remove debris, and prevent bacterial infections |
| Medial canthus | Located next to the lacrimal caruncle, connection part for the eyelids and where tears accumulate |
| Lacrimal caruncle | Responsible for producing "sleep" in the corner of the eye after sleeping |
| General senses | Pain, temperature, touch, pressure, vibration and position sense |
| Special senses | Smell, sight, taste, balance, hearing |
| Sty | Infection in a sebaceous gland of one of the eyelashes, or sweat gland that produces a painful swelling |
| Conjunctiva | Epithelium covering the inner surfaces of the eyelids and the outer surface of the eye |
| Legally blind | When visual acuity falls below 20/200 |
| Cataract | When the lens loses its transparency , the abnormal lens is called this. Overtime the lens turns yellowish and cloudy |
| Blind spot | Where the optic nerve and retinal blood vessels enter the eye. There are no rods and cones to make the vision possible |
| Color Blindness | Occurs when one or more classes of cones are nonfunctional, cannot distinguish certain colors |
| Farsightedness | Hyperopia |
| Nearsightedness | Myopia |
| Glaucoma | A condition characterized by increased intraocular pressure due to the impaired reabsoroption of aqueous humor; can result in blindness |
