Refractive error 17/10

Question 1

eyes strive to achieve what kind of refraction

Answer 1

emmetropia

Question 2

whats a leptokurtosic distribution

Answer 2

all results are squashed in the middle

Question 3

describe emmetropia

Answer 3

light correctly curved by cornea surface to hit retina

Question 4

describe myopia and why can it happen

Answer 4

light focuses in front of retina
eyes have a refracting power too strong/ long eye

Question 5

describe hyperopia and why can it happen

Answer 5

light focuses behind retina
eyes refracting power is too weak/short eye

Question 6

whats defined as high myopia

Answer 6

-5/-6 D

Question 7

why is astigmatism a distinct type of refractive error (diagnosis)

Answer 7

need an axis and magnitude to measure

Question 8

how do you correct myopia and why

Answer 8

• lens
  compensates for overly strong refractive power of eye

Question 9

how do you correct hyperopia and why

Answer 9

+ lense
compensates for weak refracting eye power

Question 10

how can hyperopia be helped non-medically
how does it work
1 condition ^

Answer 10

accommodation
crystalline lens becomes fatter = more curved = more power to focus light on retina
muscle work

Question 11

how is astigmatism corrected and why

Answer 11

cyclinder lense
has 2 axis

Question 12

how and why can axial length shortening cause refractive error

Answer 12

retina swells which pushes photoreceptors forward