functions of the eye

Question 1

visible light

Answer 1

portion of the electromagnetic spectrum detected by humans

Question 2

refraction

Answer 2

bending of light

Question 3

convergence

Answer 3

light striking a convex surface

Question 4

focal point

Answer 4

point where light rays converge and cross

Question 5

focusing

Answer 5

causing light to converge

Question 6

adjustment of focal point accomplished by

Answer 6

accomodation

Question 7

accommodation

Answer 7

lens changing shape
lens becomes more spherical and greater refraction of light
ciliary muscles contract due to parasympathetic input from CNIII

Question 8

near point of vision

Answer 8

point at which blurring occurs

Question 9

convergence

Answer 9

as objects move closer to the eyes, eyes rotate medially
reflex of medial rectus muscles

Question 10

depth of focus

Answer 10

greatest distance and object can be moved and remain in focus in the retina
size of pupil varies depth of focus

Question 11

visual acuity

Answer 11

ability to focus an image on the retina

Question 12

myopia

Answer 12

nearsightedness
can see close objects clearly but far objects blurry
-eyeball too long or cornea/lens too powerful
corrected by lasix or concave lens

Question 13

hyperpopia

Answer 13

farsightedness
can see distant object clearly but close objects poorly
lens too weak or eyeball too short
corrected with conVEX lens

Question 14

persbyopia

Answer 14

increase in near point vision with age due to decrease in lens flexibility

Question 15

Astigmatism

Answer 15

cornea or lens not uniformly curved so light rays do not focus on a single point
affects quality of focus

Question 16

images are ____ when reach retina and interpreted as by brain as ______

Answer 16

inverted; right side up