peripheral vision - ️️cannot see straight ahead, can only see peripheral
tunnel vision - ️️cannot see to the sides only straight ahead
ocular dominance - ️️the tendency to prefer visual input from one eye to the other
the miles test - ️️Used to test dominant eye; triangle with ha...
RST 230 Exam 3
peripheral vision - ✔️✔️cannot see straight ahead, can only see peripheral
tunnel vision - ✔️✔️cannot see to the sides only straight ahead
ocular dominance - ✔️✔️the tendency to prefer visual input from one eye to the other
the miles test - ✔️✔️Used to test dominant eye; triangle with hand, close one eye, the
eye that doesn't move is the dominant eye
cataracts - ✔️✔️-lens becomes milky or cloudy and this cloudiness distorts rays of light
and prevents light from being focused on the retina
-Primary cause of blindness among other adults
-Symptoms:
Blurred vision
Double vision
Poor night vision
Need for bright lights when reading
-Causes:
Lack of oxygen - disturbance in the nutrition of the lens
glaucoma - ✔️✔️-Caused by increased pressure within the eyeball
-A liquid builds up and increases pressure within the eye
-Such increased pressure can damage the optic nerve
-Symptoms:
Loss of peripheral vision
Sensitivity to light and glare
diabetic retinopathy - ✔️✔️-Diabetes causes changes in blood vessels in the retina that
cause hemorrhaging
-One of the most common causes of visual impairments and blindness in the US
-Symptoms:
Spots floating in the visual field
Vision loss
Blurred vision
Poor night vision
legally blind - ✔️✔️if his vision in the better eye, even with glasses or contact lenses, is
no better than 20/200 or if his visual field has a maximum diameter of 20 degrees
, visually impaired, partially sighted, or low vision - ✔️✔️describe a serious loss of vision
that cannot be corrected by medical or surgical procedures or with conventional
eyeglasses
acuity - ✔️✔️described amount of detail an individual sees compared to a normal eye
visual field - ✔️✔️includes entire area that can be seen at one time with the fixed eye
-Normal vision is 170 degrees roughly
tunnel vision - ✔️✔️can see straight ahead but not to the sides
major causes of visual impairments - ✔️✔️-Trauma to the eye
-Aging
-Congenital
-Disease
-Accidents
sighted guide technique - ✔️✔️-A blind person's right hand will grip your left elbow
-Keep your arm close to your body
-Blind person will travel half step behind you
-Keep the person aware of conditions or changes in surroundings, mention curbs stairs
etc
pre lingual - ✔️✔️you lose your hearing before speech develops
post lingual - ✔️✔️you lose your hearing after you have learned how to speak
Rh incompatibiltiy - ✔️✔️When a woman is negative and a man is positive and they
produce a positive baby → protein on your red blood cells?? Confused
conductive hearing loss - ✔️✔️-Outer ear or middle ear
-The most common cause of conductive hearing loss is blocked ear canals
Ex. Ear wax, barbie shoes
-Second cause = punctured ear canals
-Otosclerosis → softening and calcification of the three middle ear bones
sensorineural hearing loss - ✔️✔️-**most common type of hearing loss**, "nerve
deafness"
-Can be a result of aging, high childhood fevers, high levels of noise, viral infections
-Occur in cochlea and vestibular organs and nerve endings
-Damage of nerves from cochlea to brain
central hearing loss - ✔️✔️-Least common cause of hearing loss
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