Lab Ex 46 Human Biology - Sensory Perception

Question 1

Retina

Answer 1

layer of photoreceptors on the back inner surface of the eye

Question 2

Optic disc

Answer 2

region of the retina where blood vessels and optic nerves enter or leave the retina; lacks photoreceptors (blind spot)

Question 3

Near point

Answer 3

shortest distance at which an object is in sharp focus; the closer the distance, the greater your eye’s ability to accommodate for changes in distance; this distance gradually increases as we get older

Question 4

Visual acuity

Answer 4

sharpness of a visual image; usually measured with a Snellen eye chart

Question 5

Farsighted

Answer 5

people that focus the image behind their retina; can see distant objects clearer than close objects

Question 6

Nearsighted

Answer 6

people that focus the image in front of the retina; can see close objects better than they do distant objects

Question 7

Astigmatism

Answer 7

usually results from abnormal curvature of the cornea

Question 8

Rods

Answer 8

dim light is perceived best by these; dominate the periphery of the visual field

Question 9

Cones

Answer 9

bright light and colors are perceived best by these; most of these are in an area called the central fovea, a small part of the retina we use when we focus directly on an object and look at its color and detail

Question 10

Color blindness

Answer 10

color vision deficiency that usually is inherited

Question 11

Nerve deafness

Answer 11

results from damage to the sound receptors or neurons that transmit impulses to the brain; usually caused by exposure to loud sound (not correctable)

Question 12

Conduction deafness

Answer 12

results from damage that prevents sound vibrations from reaching the inner ear; usually correctable by surgery or hearing aids