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| The meshwork of tissue that allows aqueous fluid to flow from the anterior chamber into Schlem's canal which drains the fluid away from the eye. |
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| The capsule of the lens from the lens equator forward |
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| the space defined by the cornea and iris anteriorly and posterior. It is filled with aqueous humor. |
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| The acellular stromal tissue between the cellular corneal stroma and the basement membrane of the epithelial cells |
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| The inner or outer corner where the eyelids meet. The medial canthus is the juncture of the lids near the nose. The lateral canthus is the juncture of the lids near the ears. |
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| The small conjunctival membrane at the medial canthus that also has sebaceous glands and occaisionally fine hairs. |
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| The layer between the retina and sclera which contains many large and small blood vessels as well as Bruch's membrane. It is supplied by the ciliary circulation from the opthalmalic artery. It supplies the metabolic nutrients to the retina. |
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| The eyelashes which grow from the skin side of the lid margin |
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| A structure of muscular and glandular tissue at the peripheral base of the iris. It produces aqueous fluid, can contract to cause front to back thickening of the lens for close focusing, and extends from the root of the iris to approximately the pars plana. |
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| The thin clear mucosal membrane that contains blood vessels, nerves, and glands. It attaches at the limbus, allows the eye to move, and separates the inner orbital structures from the outside |
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| The clear connective tissue membrane which assists in the focusing of light and provides a smooth anterior optical surface |
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| The tough connective tissue membrane between the posterior corneal stroma and the endothelial cells. Descemet's can be repaired and regenerated by the corneal endothelium. |
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| The cells which form the inner most layer of the cornea. They prevent aqueous fluid from passing into the corneal stroma by actively pumping the fluid back into the anterior chamber. This prevents swelling and lack of clarity in the cornea. It is a single layer of cells that is not capable of reproducing itself. It produces, repairs and can regenerate Descemet's membrane. |
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| The outer surface of the cornea, comprised of 5-6 layers of cells which replace themselves continuously. It takes approximately 7-14 days for the epithelial cells to mature from recent products of basal cell division to shedding superficial (surface) cells |
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| The potential space between the lids and the globe. Normally this space doesn't exist because the lid is against the globe. If the lid is pulled away from the globe, the space can be seen, and is called the fornix. |
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| The color portion of the eye. Varies in color based on amount of pigmentation deposited on the iris membrane. |
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| The spoke like muscles which contract to open the pupil |
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Definition
| the round sphincter muscle which acts like a purse string to close the pupil. |
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| The angle formed by the joining of the lids furthest from the midline or closest to the ear. |
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| The crystalline protein structure, which is normally flexible to allow focusing in the early years of life. Later, it becomes less flexible, may be cloudy (cataractous) and require removal |
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| The relatively soft lens material just inside the capsule |
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| The inner, harder portion of the lens which has several layers. |
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| The lower most edge of the upper lid or upper most edge of the lower lid which contains the opening of the meibomian glands.It is the location of the junction of the skin and mucous membranes (mucicutaneous junction) |
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| The juncture between the cornea and the sclera. It is not a separate anatomical structure, but is defined as an anatomical transition zone. |
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| The angle of the eyelid opening nearest to the midline or nasal side. |
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| The sebaceuous/oil glands within the eyelid tarsal plates. They release oil onto the surface of the eye which forms the surface layer of the tear film, preventing evaporation |
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Definition
Two oblique muscles....
Superior- causes the eye to move downward and laterally on contraction.
Inferior- causes the eye to move to move upward on contraction |
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| The anatomic zone between the ending of the ciliary body posteriorly and the retina anteriorly. |
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| The capsule of the lens from the lens equator posteriorly. |
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| The portion of the eye posterior to the iris. |
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| The combination of the mucous which adheres to the cornea, the aqueous tears or water like tears that coat the mucous and the oily tears that float on top of the aqueous tears. It helps provide a smoothing of the corneal surface and optical clarity as well as lubrication. |
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| The opening in the iris which changes in size with response to different light levels. It is similar to the aperture in a camera. |
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| The muscles which act directly up and down or right and left. Four rectus muscles- superior, medial, inferior, and lateral |
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| The membrane which consists of the nerves, pigment layer photoreceptors and supporting cells that sense the reception of light within the eye. |
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| The thick central layer of the cornea which is composed of a highly ordered matrix of collagen fibers. Provides most of the corneas strength and optical clarity |
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| The cartilage like plate within the eyelids which harbors the meibomian glands and gives structural support to the lid. |
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| The connective tissue fascia which inserts at the limbus, between the conjunctiva and the sclera, and covers the globe and muscles. also known as the episcera. |
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| The iris ciliary body and choroid |
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| The small fibers that attach the peripheral lens to the ciliary body. |
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