RST 230 EXAM 3 STUDY GUIDE
legally blind - Answers :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 - Answers :describe a serious loss of
vision that cannot be corrected by medical or surgical procedures or with conventional
eyeglasses
acuity - Answers :described amount of detail an individual sees compared to a normal
eye
visual field - Answers :includes entire area that can be seen at one time with the fixed
eye
-Normal vision is 170 degrees roughly
tunnel vision - Answers :can see straight ahead but not to the sides
peripheral vision - Answers :cannot see straight ahead, can only see peripheral
tunnel vision - Answers :cannot see to the sides only straight ahead
ocular dominance - Answers :the tendency to prefer visual input from one eye to the
other
the miles test - Answers :Used to test dominant eye; triangle with hand, close one eye,
the eye that doesn't move is the dominant eye
cataracts - Answers :-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 - Answers :-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 - Answers :-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
major causes of visual impairments - Answers :-Trauma to the eye
-Aging
-Congenital
-Disease
-Accidents
sighted guide technique - Answers :-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
hearing impairment - Answers :general term used to describe all types of hearing loss,
ranging from very mild to profound deafness.
deafness - Answers :state occurring when a person is unable to understand speech
through the ear alone, either with or without a hearing aid.
hard of hearing - Answers :people who have mild to moderate hearing loss resulting in
decreased perception of conversational speech, but sufficient hearing to permit
understanding under optimal circumstances.
pre lingual - Answers :you lose your hearing before speech develops
post lingual - Answers :you lose your hearing after you have learned how to speak
Rh incompatibiltiy - Answers :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 - Answers :-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
legally blind - Answers :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 - Answers :describe a serious loss of
vision that cannot be corrected by medical or surgical procedures or with conventional
eyeglasses
acuity - Answers :described amount of detail an individual sees compared to a normal
eye
visual field - Answers :includes entire area that can be seen at one time with the fixed
eye
-Normal vision is 170 degrees roughly
tunnel vision - Answers :can see straight ahead but not to the sides
peripheral vision - Answers :cannot see straight ahead, can only see peripheral
tunnel vision - Answers :cannot see to the sides only straight ahead
ocular dominance - Answers :the tendency to prefer visual input from one eye to the
other
the miles test - Answers :Used to test dominant eye; triangle with hand, close one eye,
the eye that doesn't move is the dominant eye
cataracts - Answers :-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 - Answers :-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 - Answers :-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
major causes of visual impairments - Answers :-Trauma to the eye
-Aging
-Congenital
-Disease
-Accidents
sighted guide technique - Answers :-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
hearing impairment - Answers :general term used to describe all types of hearing loss,
ranging from very mild to profound deafness.
deafness - Answers :state occurring when a person is unable to understand speech
through the ear alone, either with or without a hearing aid.
hard of hearing - Answers :people who have mild to moderate hearing loss resulting in
decreased perception of conversational speech, but sufficient hearing to permit
understanding under optimal circumstances.
pre lingual - Answers :you lose your hearing before speech develops
post lingual - Answers :you lose your hearing after you have learned how to speak
Rh incompatibiltiy - Answers :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 - Answers :-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
