Ch 17 Eye

Front 1

Hemi

Back 1

Half

Front 2

An

Back 2

Without

Front 3

Opsia

Back 3

Means vision

Front 4

Accomodation

Back 4

Norman adjustment of the eye to focus on object's from far to near. The ciliary body adjusts the lens (rounding it) and the pupil contracts. When the eye focused from near to far the diary body flattens the lens and the pupil dilates.

Front 5

Anterior Chamber

Back 5

Area behind the cornea and in front of the lens and iris. It contains the aqueous humor.

Front 6

Aqueous humor

Back 6

Fluid produced by the culinary body and found in the anterior chamber. A humor (from Latin humidus means moist) is any body fluid, including blood and lymph.

Front 7

Bioconvex

Back 7

Consisting of two surfaces that are rounded, elevated, and curved evenly, like part of a sphere. The lens of the eye is a biconvix body.

Front 8

Ciliary body

Back 8

Structure on each side of the lens that connects the choroid and iris. It contains ciliary muscles, which control the shape of the lens, and it secretes aqueous humor.

Front 9

Choroid

Back 9

Middle vascular layer of the eye, between the retina and the cornea.

Front 10

Cone

Back 10

Photoreceptor cell in the retina that transforms light energy into a nerve impulse. Cone are responsible for color and central vision.

Front 11

Conjunctiva

Back 11

Delicate membrane lining the eyelids and covering the eyeball.

Front 12

Cornea

Back 12

Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball. Derived from Latin corneus, meaning horney, perhaps because as it protrudes forward it was thought to resemble a horn.

Front 13

Fovea centralis

Back 13

Tiny pit or depression in the retina that is the region of clearest vision.

Front 14

Fundus of the eye

Back 14

Posterior interior part of the eye; visualizes with an opthalmscop.

Front 15

Lens

Back 15

Transparent, bioconvex body behind the pupil of the eye. It bends (retracts light rays to bring them into focus on the retina)

Front 16

Macula

Back 16

Yellowish region on the retina layers to and below the optic disk; contains the fovea centralis; which is the area of clearest vision.

Front 17

Optic chiasm

Back 17

Point at which optic nerve fibers cross in the brain

Front 18

Optic nerve

Back 18

Cranial nerve carrying impulses from the retina to the brain. (Cerebral cortex)

Front 19

Optic disk

Back 19

Region in the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because.t contains only nerve fibers; no rods or cones, and thus is insensitive to light.

Front 20

Pupil

Back 20

Central opening of the eye, surrounded by the iris, through which light rays pass.

Front 21

Fefraction

Back 21

Bending of light rays by the cornea, lens and fluids, of the eye, to bring the rays into focus on the retina. Refract means to break (-frack) back (-re)

Front 22

Retina

Back 22

Light sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cons)

Front 23

Rod

Back 23

Photoreceptor cell of the retina essential for vision in low light and for peripheral vision.

Front 24

Thalamus

Back 24

Relay center of the brain. Optic nerve fibers pass through the thalamus on their way to the cerebral cortex.

Front 25

Vitreous humor

Back 25

Soft, jelly like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball.

Front 26

Blephar/ palpebr

Back 26

Eyelid

Front 27

Cor

Back 27

Pupil

Front 28

Corne

Back 28

Cornea

Front 29

Cycl

Back 29

Ciliary body or muscle of the eye

Front 30

Dacry

Back 30

Tears or tear duct

Front 31

ir or irid

Back 31

Iris

Front 32

Kerat

Back 32

Cornea

Front 33

Lacrim

Back 33

Tears

Front 34

Ocul

Back 34

Eye

Front 35

Opthalm

Back 35

Eye

Front 36

Palpebr

Back 36

Eyelid

Front 37

Papill

Back 37

Optic disk; nipple like

Front 38

Phac or phak

Back 38

Lens of the eye

Front 39

Uve

Back 39

Uvea; vascular layer of the eye (iris, ciliary body, and choroid)

Front 40

Vitre

Back 40

Glassy

Front 41

Ambly

Back 41

Dull, dim

Front 42

Dipl

Back 42

Double

Front 43

Glauc

Back 43

Gray

Front 44

Mi

Back 44

Smaller or less

Front 45

Mydr

Back 45

Widen enlarge

Front 46

Nyct

Back 46

Night

Front 47

Phot

Back 47

Light

Front 48

Presby

Back 48

Old age

Front 49

Scot

Back 49

Darkness

Front 50

Xer

Back 50

Dry

Front 51

Opia

Back 51

Vision

Front 52

Opsia

Back 52

Vision

Front 53

Tropia

Back 53

To Turn

Front 54

Blepharitis

Back 54

Inflammation of the eyelids, causing redness, crusting, and swelling along the lid margins.

Front 55

Chalazion

Back 55

Granuloma formed around an inflamed sebaceous gland

Front 56

Dacryocystitis

Back 56

Blockage, inflammation, and infection of nasolacrimal duct and lacrimal sac, causing redness and swelling in the region between the nose and lower lid

Front 57

Ectrpion

Back 57

Outward sagging and aversion of the eyelid, leading to improper lacrimation and cornea drying and ulcerarion.

Front 58

Entropion

Back 58

Inversion of the eyelid, causing the lashes to rub against the eye, corneal abrasion may result.

Front 59

Hordeolum (stye)

Back 59

Small, superficial white nodule along the margin due to infection of a sebaceous gland.

Front 60

Ptosis

Back 60

Drooping of upper lid margin from neuromuscular problems or trama.

Front 61

Xanthelasma

Back 61

Raised yellowish plague on eyelid caused by lipid disorder (xanth = yellow, elasma = plate)

Front 62

Choroid

Back 62

Middle, vascular area of the eye, between the retina and the sclera.

Front 63

Opt

Back 63

Eye, vision

Front 64

Astigmatism

Back 64

Detective curvature of the cornea or lens of the eye. Results from one or more abnormal curvature of the retina or lens. Causes light rays to be unevenly and not sharply focused on the retina, so that the image is distorted.

Front 65

Hyperopia (hypermetropia)

Back 65

Farsightedness. Eyeball is too short (from front to back) or the refractive power of the lens is too weak. Parallel rays of light tend to focus behind the retina, which results in a blurred image. A convex lens (thicker in the middle than at the sides) bends the rays inward before they can reach the cornea, and thus the rays can be focused properly on the retina.

Front 66

Myopia

Back 66

Farsightedness. In myopia the eyeball is too long (front to back) or the refractive power of the lens is so strong that light rays do not properly focus on the retina. Concave glasses (thicker in the periphery than in the middle) correct this condition because the lenses spread the rays out before they reach the cornea, so that they can be properly focused directly on the retina.

Front 67

Presbyopia

Back 67

Impairment of vision as a result of old age. With increasing age, loss of elasticity of the ciliary body impairs its ability to adjust the lens for accommodation to near vision. The lens of the eye cannot thicken to bend rays coming from near objects (less than 20 ft away). The light rays focus behind the retina, as in hyperopia. Therefore, a convex lens is needed to retract the rays coming from objects closer than 20 feet.