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FHS HAP Sensation

Eyelids protect and help keep eye moist
Eyelashes Contain glands at base of lash, oily secretion lubricates eye
Conjunctiva membrane that lines the eyelids and connects to outer surface of the eye
Lacrimal Apparatus includes gland and ducts, produces fluid (tears) to protect, moisten and lubricate eye.
Lacrimal fluid (tears) contains: * dilute salt solution * mucus * antibodies & enzymes
Extrinsic Muscles Six muscles attached to outer surface of the eye * Produce eye movements to follow objects
Fibrous Layer (outside layer)
Sclera "white part" of the eye
Cornea clear covering over iris & pupil Most exposed part of eye Well supplied with nerve (pain) receptors Extraordinary ability to repair itself Only tissue in body when transplanted there is no worry of rejection (beyond reach of the immune system)
Vascular Layer middle layer
Choroid posterior. dark pigment
Ciliary body anterior, attaches to lens
Iris colored part, made of smooth muscle
Pupil opening within iris, allows light to lens
Sensory Layer inside layer including retina, rods, cones, fovia centralis, optic nerves, and optic disks
Retina inside of the back of the eyeball
Rods photoreceptor for low light
Cones photoreceptor for color
Fovia Centralis high concentration of cones, point of greatest visual acuity
Optic disc blind spot at optic nerve
Optic nerve sends impulses to optic cortex
Lens biconcave, crystal-like
Chambers anterior to lens holds aqueous humor posterior to lens holds vitreous humor
Ophthalmoscope *Illuminates interior of eyeball Used to detect: *diabetes *arteriosclerosis *degeneration of the optic nerve and retina
hyperopia condition of the eye in which parallel rays are focused behind the retina, distant objects being seen more distinctly than near ones; farsightedness
Refracted To deflect something, especially light, from a straight path by refraction.
Accommodation Of Eye In medicine, the ability of the eye to change its focus from distant to near objects (and vice versa). This process is achieved by the lens changing its shape.
myopia Nearsightedness, the ability to see close objects more clearly than distant objects
Astigmatism a common type of visual problem that partly blurs an image. This is because there is irregularity in the curve of the front surface of the eye
Accommodation Pupillary Reflex Reflex constriction of pupils when viewing close objects
Aqueous humor Fluid in the anterior segment that provides nutrients to the lens and cornea
Vitreous Humor Gel-like substance that helps to reinforce the eyeball
Choroid Heavily pigmented layer that prevents light scattering within the eyes
Color Blindness Color blindness occurs when there is a problem with the color-sensing granules (pigments) in certain nerve cells of the eye. These cells are called cones. They are found in the retina, the light-sensitive layer of tissue that lines the back of the eye.
Tapetum Lucidum The tapetum lucidum (Latin: "bright tapestry", plural tapeta lucida) is a layer of tissue in the eye of many vertebrate..
Convergence Reflex responsible for keeping the eyes aligned and focused on an object.
Created by: kuhlsion000