Test 4 section 1 Flashcards
normal vision
emmetropia
nearsighted
myopia
farsighted
hyperopia
distortion caused by irregularity of cornea
astigmatism
measures intraocular pressure
tonometry
visualizes angle of anterior chamber
Gonioscopy
evaluates field of vision
perimetry testing
blind areas in visual field
scotomas
color vison test
Ishihara color test
used for judging distance
stereopsis
requires devices and correction lenses
Best corrected visual acuity (BCVA) of 20/70 to 20/200
low vision
BCVA 20/400 to no light perception
Blindness
is BCVA that does not exceed 20/200 in better eye or widest field of vision is 20 degrees or less
legal blindness
Normal IOP
10 ro 21 mm Hg
open-angle glaucoma pressure
22 to 32 mm Hg
acute angle-closure glaucoma pressure
> 50 mm Hg
type of glaucoma that is slow, with decreased peripheral and tunnel vision
open angle
type of glaucoma that is sudden, with excruciating eye pain, n/v, and redness
angle closure
unaware of condition until there is significant vision loss, peripheral vision loss, blurring, halos, difficulty focusing, difficulty adjusting eyes to low lighting
silent thief
an opacity or cloudiness of lens
cataracts
most common type of cataract
Altered metabolic processes cause accumulation of water and altered lens fiber structure
Senile cataract
removes entire lens
Rarely done today
Intracapsular Cataract extraction ICCE
maintains posterior capsule of lens, reducing potential postoperative complications
Extracapsular cataract extraction ECCE
an ECCE that uses an ultrasound device to suction lens out through a tube, incision is smaller than with standard ECCE
phacoemulsification
phototherapeutic keratectomy
is a type of eye surgery that uses a laser to treat various ocular disorders by removing tissue from the cornea
Elective procedures to recontour corneal tissue and correct refractive errors
Refractive SX
separation of sensory retina and RPE (retinal pigment epithelium)
retinal detachment
removal of vitreous locating incisions at pars plana
Frequently used in combo with other procedures
Pars plana vitrectomy
Injected gas bubble, liquid, or oil is used to flatten sensory retina against RPE
Postoperative positioning is critical
pneumatic retinopexy
Scleral Buckle
used to repair retinal detachment
slow breakdown of layers of retinal with appearance of drusen
dry macular degeneration
tiny yellow white accumulations of extracellular material
drusen
proliferation of abnormal blood vessels growing under retina
revascularization
hearing loss as a result of aging
presbycusis
caused by external of middle ear problem
conductive
caused by damage to cochlea or vestibulocohlear nerve
sensorineural
fluid in middle ear without evidence of infection
serous otitis media
abnormal inner ear fluid balance cause by malabsorption of endolymphatic sac or blockage of endolymphatic duct
menieres disease
varied degrees of inability to speak, interpret, or understand language
aphasia
lens less flexible
presbyopia
disruption or break in continuity of structure of bone
fractures
fracture heals in abnormal position in relation to midline of structure
angulation
type of nonunion occurring at fracture site in which a false joint is formed with abnormal movement at site
pseudoarthrosis
new fracture occurs at original fracture site
refracture
deposition of calcium in muscle tissue at site of significant blunt muscle trauma or repeated muscle injury
myositis ossificans
is a type of skin traction that is used to immobilize a fracture, prevent hip flexion contractures, and reduce muscle spasms
bucks traction boot
