RST 230 EXAM 3 STUDY GUIDE
QUESTIONS AND CORRECT
ANSWERS
Glaucoma: Definition, symptoms, and causes ANSW✅✅Definition: Fluid builds up and increases
pressure within the eyeball and can damage the optic nerve
Symptoms: Loss of peripheral vision; sensitivity to light; blurred vision
Causes: Caused by increased pressure within the eyeball
Diabetic Retinopathy: Definition, symptoms, and causes ANSW✅✅Definition: Diabetes causes
changes in blood vessels in the retina that cause hemorrhaging; one of the most common visual
impairments in the U.S.
Symptoms: Spots floating in the visual field; vision loss
Causes: Diabetes
What are the major causes of visual impairments (in general)? ANSW✅✅Aging, congenital,
disease, accidents
Sighted guide technique ANSW✅✅Blind person's right hand will grip your left elbow; the blind
person will travel a half-step behind you
Hearing impairment ANSW✅✅A general term used to describe all types of hearing loss, ranging
from very mild to profound deafness
Deafness ANSW✅✅State occurring when a person is unable to understand speech through the
ear alone, either with or without a hearing aid
, Hard of hearing ANSW✅✅People who have mild to moderate hearing loss resulting in decreased
perception of conversational speech, but sufficient hearing to permit understanding under optimal
circumstances
legally blind ANSW✅✅a person is legally blind if his/her vision in the better eye, even with
glasses, is no better than 20/200 or if his/her visual field has a maximum diameter of 20 degrees
Visually impaired/partially sighted ANSW✅✅a serious loss that cannot be corrected by medical or
surgical procedures or with eyeglasses
Acuity ANSW✅✅describes the amount of detail an individual sees compared to what a person
with normal vision sees
Visual Field ANSW✅✅includes the entire area that can be seen at one time with the fixed eye
Tunnel vision ANSW✅✅when you can see straight ahead but cannot see to the side
Peripheral vision ANSW✅✅when you can see the periphery but cannot see straight ahead
Cataracts: Definition, symptoms, and causes ANSW✅✅Definition: The lens becomes milky or
cloudy and this cloudiness distorts rays of light and prevents light from being focused on the retina
Symptoms: Blurred vision, double vision, need for bright lights when reading
Causes: Lack of oxygen which leads to a disturbance of the nutrition of the lens; External forces such
as wounds, electric shock, or x-rays
Pre-lingual hearing loss ANSW✅✅occurs before speech develops
Post-lingual hearing loss ANSW✅✅occurs after speech has developed
QUESTIONS AND CORRECT
ANSWERS
Glaucoma: Definition, symptoms, and causes ANSW✅✅Definition: Fluid builds up and increases
pressure within the eyeball and can damage the optic nerve
Symptoms: Loss of peripheral vision; sensitivity to light; blurred vision
Causes: Caused by increased pressure within the eyeball
Diabetic Retinopathy: Definition, symptoms, and causes ANSW✅✅Definition: Diabetes causes
changes in blood vessels in the retina that cause hemorrhaging; one of the most common visual
impairments in the U.S.
Symptoms: Spots floating in the visual field; vision loss
Causes: Diabetes
What are the major causes of visual impairments (in general)? ANSW✅✅Aging, congenital,
disease, accidents
Sighted guide technique ANSW✅✅Blind person's right hand will grip your left elbow; the blind
person will travel a half-step behind you
Hearing impairment ANSW✅✅A general term used to describe all types of hearing loss, ranging
from very mild to profound deafness
Deafness ANSW✅✅State occurring when a person is unable to understand speech through the
ear alone, either with or without a hearing aid
, Hard of hearing ANSW✅✅People who have mild to moderate hearing loss resulting in decreased
perception of conversational speech, but sufficient hearing to permit understanding under optimal
circumstances
legally blind ANSW✅✅a person is legally blind if his/her vision in the better eye, even with
glasses, is no better than 20/200 or if his/her visual field has a maximum diameter of 20 degrees
Visually impaired/partially sighted ANSW✅✅a serious loss that cannot be corrected by medical or
surgical procedures or with eyeglasses
Acuity ANSW✅✅describes the amount of detail an individual sees compared to what a person
with normal vision sees
Visual Field ANSW✅✅includes the entire area that can be seen at one time with the fixed eye
Tunnel vision ANSW✅✅when you can see straight ahead but cannot see to the side
Peripheral vision ANSW✅✅when you can see the periphery but cannot see straight ahead
Cataracts: Definition, symptoms, and causes ANSW✅✅Definition: The lens becomes milky or
cloudy and this cloudiness distorts rays of light and prevents light from being focused on the retina
Symptoms: Blurred vision, double vision, need for bright lights when reading
Causes: Lack of oxygen which leads to a disturbance of the nutrition of the lens; External forces such
as wounds, electric shock, or x-rays
Pre-lingual hearing loss ANSW✅✅occurs before speech develops
Post-lingual hearing loss ANSW✅✅occurs after speech has developed
