RST 230 Exam 3 Questions with Verified
Correct Answers
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
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
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
hearing impairment
general term used to describe all types of hearing loss, ranging from very mild to profound
deafness.
deafness
Correct Answers
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
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
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
hearing impairment
general term used to describe all types of hearing loss, ranging from very mild to profound
deafness.
deafness
