oculus

oc·u·lus

O0029450 (ŏk′yə-ləs)n. pl. oc·u·li (-lī′) Architecture An eyelike opening or ornament, especially:a. A round window.b. A circular opening at the apex of a dome.

[Medieval Latin, from Latin, eye; see ok^w- in Indo-European roots.]

oculus

(ˈɒkjʊləs) n1. (Botany) botany the leaf bud or beginnings of a leaf in a plant2. (Architecture) architect a circular aperture

Thesaurus

Noun

oculus - the organ of sight eye, opticsense organ, sensory receptor, receptor - an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulationvisual system - the sensory system for visionnaked eye - the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects; "it is not safe to look directly at the sun with the naked eye"peeper - an informal term referring to the eyeoculus dexter, OD - the right eyeoculus sinister, OS - the left eyeocellus, simple eye, stemma - an eye having a single lenscompound eye - in insects and some crustaceans: composed of many light-sensitive elements each forming a portion of an imagechoroid, choroid coat - a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eyeciliary body - the part of the tunic of the eye between the choroid coat and the iris; "the ciliary body produces aqueous humor"eyelid, lid, palpebra - either of two folds of skin that can be moved to cover or open the eye; "his lids would stay open no longer"canthus - either of the corners of the eye where the upper and lower eyelids meetepicanthic fold, epicanthus - a vertical fold of skin over the nasal canthus; normal for Mongolian peoples; sometimes occurs in Down's syndromenictitating membrane, third eyelid - a protective fold of skin in the eyes of reptiles and birds and some mammalsconjunctiva - a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelideyeball, orb - the ball-shaped capsule containing the vertebrate eyeeye muscle, ocular muscle - one of the small muscles of the eye that serve to rotate the eyeballcornea - the transparent dome-shaped anterior portion of the outer covering of the eye; it covers the iris and pupil and is continuous with the sclerauvea - the part of the eye that contains the iris and ciliary body and choroiduveoscleral pathway - a tubule that drains excess aqueous humoriris - muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eyecrystalline lens, lens of the eye, lens - biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses light on the retinaarteria centralis retinae, central artery of the retina - a branch of the ophthalmic artery; enters the eyeball with the optic nervearteria ciliaris, ciliary artery - one of several arteries supplying the choroid coat of the eyearteria lacrimalis, lacrimal artery - an artery that originates from the ophthalmic artery and supplies the lacrimal gland and rectal eye muscles and the upper eyelid and the foreheadlacrimal vein, vena lacrimalis - drains the lacrimal gland; empties into the superior ophthalmic veinlacrimal apparatus - the structures that secrete and drain tears from the eyeretina - the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nervesclera, sclerotic coat - the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeballmusculus sphincter pupillae, pupillary sphincter - a ring of smooth muscle surrounding the irisface, human face - the front of the human head from the forehead to the chin and ear to ear; "he washed his face"; "I wish I had seen the look on his face when he got the news"colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speechaperture - a natural opening in something

oculus

eye

[i] the organ of vision" >vision; see also Plates. In the embryo the eye develops as a direct extension of the brain, and thus is a very delicate organ. To protect the eye the bones of the skull are shaped so that an orbital cavity protects the dorsal aspect of each eyeball. In addition, the conjunctival sac covers the front of the eyeball and lines the upper and lower eyelids. Tears from the lacrimal duct constantly wash the eye to remove foreign objects, and the lids and eyelashes help protect the front of the eye.Structure. The eyeball has three coats. The cornea is the clear transparent layer on the front of the eyeball; it is a continuation of the sclera (the white of the eye), the tough outer coat that helps protect the delicate mechanism of the eye. The choroid" >choroid is the middle layer and contains blood vessels. The third layer, the retina" >retina, contains rods and cones, which are specialized cells that are sensitive to light. Behind the cornea and in front of the lens is the iris, the circular pigmented band around the pupil. The iris works much like the diaphragm in a camera, widening or narrowing the pupil to adjust to different light conditions.Function. (See also vision" >vision.) The refraction or bending of light rays so that they focus on the retina and can thus be transmitted to the optic nerve is accomplished by three structures: the aqueous humor, a watery substance between the cornea and lens; the lens, a crystalline structure just behind the iris; and the vitreous humor, a jelly-like substance filling the space between the lens and the retina. Unlike the lens of a camera, the lens of the eye focuses by a process called accommodation. This means that when the eye sees something in the distance, muscles pull the lens, stretching it until it is thin and almost flat, so that the light rays are only slightly bent as they pass through it. When the object is close, the muscles relax and the elastic lens becomes thicker, bending the light rays and focusing them on the retina.
Because the eye must function under many different circumstances, there are two types of nerve cells in the retina, with different shapes: the cones" >cones and the rods" >rods. They cover the full range of adaptation to light, the cones being sensitive in bright light, and the rods in dim light. The cones are responsible for color vision. There are three types of cones, each containing a substance that reacts to light of a different color, one set for red, one for green, and one for violet. These are the primary colors in light, which, when mixed together, give white. White light stimulates all three sets of color cells; any other color stimulates one or two.
The optic nerve, which transmits the nerve impulses from the retina to the visual center of the brain, contains nerve fibers from the many nerve cells in the retina. The small spot where it leaves the retina does not have any light-sensitive cells, and is called the blind spot.
The eyes are situated in the front of the head in such a way that human beings have stereoscopic vision, the ability to judge distances. Because the eyes are set apart, each eye sees farther around an object on its own side than does the other. The brain superimposes the two slightly different images and judges distances from the composite image.Disorders of the Eye. If the eyeball is too short or too long, the lens focuses the image not on the retina but behind or in front of it. The former condition is called hyperopia" >hyperopia (or farsightedness) and the latter myopia" >myopia (or nearsightedness). An irregularity in the curvature of the cornea or lens can cause the impaired vision of astigmatism. strabismus (or squint or crossed eyes) is usually caused by weakness in muscles that control movement of the eyeball. conjunctivitis is an inflammation of the membrane that covers the front of the eyeball and lines the eyelids. When small pieces of the retina become detached from the underlying layers, the result is a detachment" >retinal detachment; surgery may be necessary to prevent blindness. presbyopia (usually taking the form of hyperopia) occurs in older persons and develops as the lens loses its elasticity with the passing years. Correction is easily made with properly prescribed eyeglasses.
Foreign bodies in the eyes are common occurrences. Protective eyewear should be worn by individuals at risk. Cinders, grit, or other foreign bodies are best removed by lifting the eyelid by the lashes. The foreign body will usually remain on the surface of the lid, and can easily be removed. Particles embedded in the eyeball must be removed by a qualified health care professional.
Eyestrain is fatigue of the eyes caused by improper use, uncorrected defects in the vision, or an eye disorder. Symptoms may include aching or pains in the eyes, or a hot, scratchy feeling in the eyelids. Headache, blurring or dimness of vision, and sometimes dizziness or nausea may also occur.

Anatomic features of the eye. From Ignatavicius and Workman, 2002.artificial eye a glass or plastic prosthesis inserted in the eye socket to replace the eyeball; most are designed to be worn day and night. When patients become debilitated and unable to care for such a prosthesis, they must depend on members of the health care team to give proper care according to the chosen preferred routine.
Cleaning of a prosthetic eye is similar in principle to care of dentures; both are handled with care to avoid damage and are cleansed according to good hygienic principles. The prosthesis is removed while the patient is lying down so that it falls into the hand and is not likely to be dropped and broken. It is removed by depressing the lower eyelid, allowing the prosthesis to slide out and down. Mild soap and water are most often used for cleansing the prosthesis. Alcohol or other chemicals can damage prostheses made of plastic. If it is not replaced in the socket immediately after cleansing, it is stored in water or contact lens soaking solution. Insertion of the prosthesis is done by lifting the upper eyelid with the thumb or forefinger and placing its notched edge toward the nose. It is placed as far as possible under the upper lid and then the lower lid is depressed to allow it to slip into place. The process can be made easier by first moistening the prosthesis with water. If it is necessary to wipe the eye area of a patient wearing a prosthesis, one should gently wipe toward the nose in order not to dislodge the prosthesis.cross eye esotropia.dry eye keratoconjunctivitis sicca.pink eye popular term for acute contagious conjunctivitis.raccoon e's ecchymotic areas surrounding both eyes, suggestive of a basilar skull fracture.wall eye exotropia.

eye

(ī), [TA] 1. The organ of vision that consists of the eyeball and the optic nerve; Synonym(s): oculus [TA]2. The area of the eye, including lids and other accessory organs of the eye; the contents of the orbit (common). [A.S. eāge]

eye

(ī) [TA] 1. The organ of vision that consists of the eyeball and the optic nerve.
Synonym(s): oculus [TA] . 2. The area of the eye, including lids and other accessory organs of the eye; the contents of the orbit (common). [A.S. eāge]

oculus

Latin for eye. Plural: oculi.

oculus

oc·u·lus

oculus

Oculus

Oculus

oculus

oculus

eye

eye

eye

oculus

oculus

Synonyms for oculus

noun the organ of sight

Synonyms

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