Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Vision Assess
Assessment
| Question | Answer |
|---|---|
| Layers of eyeball | sclera, uvea, retina |
| Sclera | white of eye, outer layer |
| Uvea | middle layer, contains choroid, ciliary body, iris |
| Choroid | blood vessels |
| Ciliary body | connects choroid and iris, secretes aqueous humor |
| Iris | colored portion |
| Pupil | center of iris |
| Retina | innermost layer, sensory receptor that send info to optic nerve, contains rods & cones |
| Rods | low light, peripheral vision |
| Cones | bright light, color, central vision |
| Optic fundus | inside & back of eye, contains optic disc |
| Optic disc | depressed area in optic fundus, where optic nerve enters eye, AKA blind spot |
| Fovea centralis | where vision is most accurate, in center of macula lutea which is to the side of the optic disc |
| Cornea | clear layer on front of eye |
| Aqueous humor | continuous production, drains through canal of Schlemm to balance IOP (intraocular pressure) |
| Lens | convex, behind iris and in front of vitreous body |
| Vitreous body | contains vitreous humor, non-replaceable |
| Canthus | place where upper & lower iris meet |
| Conjunctivae | mucous membrane of eye |
| Lacrimal gland (Location) | upper outer part of each orbit |
| Tears | flow across eye, to nose; drain through punctum into lacrimal duct & sac then into nose |
| Ocular muscle innervation | CN III (Oculomotor), IV (Trochlear), VI (Abducens) |
| Blink reflex | CN V (trigeminal) |
| Lacrimal gland & lid closure muscle innervation | CN VII (facial) |
| Superior rectus muscle + Lateral rectus | moves eye diagonally upward toward side of head |
| Superior rectus + Medial rectus | moves eye diagonally toward upper medial head |
| Lateral rectus + Medial rectus | holds eye in straight position |
| Lateral rectus | turns eye toward side of head |
| Medial rectus | turns eye toward nose |
| Inferior rectus + Lateral rectus | diagonally downward toward side of head |
| Inferior rectus + Medial rectus | moves eye diagonally downward toward middle of head |
| Superior oblique | pulls eye downward |
| Inferior oblique | pulls eye upward |
| Functions of eye that provide clear images | Refraction, papillary constriction, accommodation, convergence |
| Curved surfaces + Refractive media | light refraction to focus image directly on retina |
| Refraction result | image inverted & reversed left to right when it reaches retina |
| Emmetropia | perfect refraction; image converges on retina |
| Hyperopia/farsightedness | eye does not refract enough light; image converges behind retina |
| Hyperopia (Effect on vision) | distance vision normal, near vision poor |
| Myopia/nearsightedness | eye over refracts light; image converges in front of retina |
| Myopia (Effect on vision) | distance vision poor, near vision normal |
| Astigmatism | refractive error due to unevenly curved surfaces |
| Astigmatism (Effect on vision) | distorts vision |
| Miosis | pupillary constriction |
| Mydriasis | pupillary dilation |
| Accommodation | maintain clear image when gaze is shifted from distant to nearby changing curve of lens |
| Exophthalmos (proposes) | eye protrusion |
| Enophthalmos | sunken eye |
| Ptosis | drooping of eyelids |
| Anisocoria | difference in pupil sizes; normal in 5% of people |
| Normal pupil size | 3 to 5mm |
| Consensual response | constriction of left pupil when light is shined at right pupil and vice versa |
| To assess for accommodation | hold index finger 18cm from pt nose and move it toward nose; normal result is both eyes converge and constrict equally |
| Hemianopia | blindness of ½ the field of vision |
| Quadrantanopia | blindness in ¼ the field of vision |
| Scotomas | blind spots in field of vision |
| Nystagmus | involuntary and rapid twitching of eyeball |
| Tonometry | assesses IOP, normal IOP is 10-21mmHg |
Created by:
jlee12406
Popular Nursing sets