Term
|
Definition
| The tough, fibrous white outer coating of the eye |
|
|
Term
| What are the functions of the sclera? |
|
Definition
Protection of the eyeball
Along with the cornea, it provides the eye's shape
By being opaque, it excludes stray light
Provides a smooth surface for the retina inside & a place for attachment of the extrinsic muscles on the outside |
|
|
Term
|
Definition
| The transparent outer cover at the front of the eye. It is comprised of the five layers |
|
|
Term
| What is the Cornea diopters and index? |
|
Definition
|
|
Term
| What are the five layers of the cornea from outside to inside? |
|
Definition
Epithelium
Bowman's membrane
Stroma or substantia propria (90% of the corneal thickness)
Descemet's membrane
Endothelium |
|
|
Term
|
Definition
| A vascular membrane that lines the eyelids & the front of the globe, excluding the cornea |
|
|
Term
|
Definition
| The colored portion of the eye located behind the sclera & in front of the lens. By opening & closing it regulates the size of the pupil and thereby regulates the amount of light that enters the eye. Controlled by the sphincter and dilator muscles within the iris |
|
|
Term
| What is the crystalline lens |
|
Definition
| A transparent, biconvex body located between the vitreous humor and the iris. Posterior is more convex. |
|
|
Term
| What is the index of the crystalline lens? |
|
Definition
|
|
Term
| What is the ciliary body? |
|
Definition
| An extension of the choroid at the end of the retina to the base of the iris. It consists of the ciliary processes, Which produces the aqueous humor, and the ciliary muscle, which controls the process of accommodation. The muscle is connected to the lens by small ligaments called the zonules of Zinn of the suspensory ligaments |
|
|
Term
|
Definition
| The vascular coat of the eye. The second coat of the eye, located between the sclera and the retina, it is responsible for supplying the nutrition to the rest of the eye |
|
|
Term
| What is the anterior chamber? |
|
Definition
| A space in the front of the eye that is formed between the cornea and the iris. It is filled with aqueous humor. POSTERIOR chamber. A small space between the iris and the lens that is also filled with aqueous humor |
|
|
Term
|
Definition
| A transparent liquid that is actually a blood filtrate supplied by the ciliary processes. It circulates front he posterior chamber through the pupil, into the anterior chamber and finally exits through the canal of Schlemm. This is a circular canal at the sclera/corneal junction. N = 1.337, virteous humor: N = 1.337. A transparent jelly-like substance that comprises 4/5 ths of the eye's volume. Like the aqueous, it provides little refractive power |
|
|
Term
| What is the index of the sclera/corneal junction? |
|
Definition
|
|
Term
|
Definition
The delicate innermost layer of the eye that is composed of the nerve fibers (rods/cones) that are responsible for light perception.
Macula an area of distinct vision on the retina that surrounds the forvea centralis. |
|
|
Term
| What is the most distinct area of vision? |
|
Definition
|
|
Term
| What are the rods responsible for? |
|
Definition
| Rods are responsible for our vision in low light conditions (black/white) and peripheral vision |
|
|
Term
| Rods contain what kind of chemical that is responsible for night vision? |
|
Definition
| Rhodopsin or visual purple |
|
|
Term
| What are cones responsible for? |
|
Definition
| Cones are responsible for color vision, central vision |
|
|
Term
| What is the optic disc (optic nerve head)? |
|
Definition
| Where optic nerve meets with the retina. There is NO vision in this spot (scotoma) |
|
|
Term
| What is the central retinal artery and vein? |
|
Definition
| Carries blood to and from the eye. They enter eye in the area of the optic nerve |
|
|
