Vision 1 - von Bartheld Flashcards Preview

Block 5 Week 2 Dani > Vision 1 - von Bartheld > Flashcards

Flashcards in Vision 1 - von Bartheld Deck (103)
Loading flashcards...
1

Where is the focal point of a convex lenz?

in front of it

2

Where is the focal point of a concave (diverging) lens?

behind it

3

What is known as the distance of the focal point to the lens?

Focal length

4

What is the basic unit of focal power?

diopter

5

what is the relation between diopters and focal length?

D= 1/f

6

How do we determine focal power?

Focal power = Refractive index/ Focal length

7

Glaucoma is caused by a problem with (blank)

Aqueous humor drainage

8

the curvature of the (blank) controls accommodation

lens

9

Is the accommodated lens for flat or more round?

more round

10

What nucleus in the brainstem is activated during accommodation?

Edinger-Westphal nucleus of oculomotor

11

what ganglion is activated during accomodation?

ciliary ganglion

12

Ciliary muscles (relax/contract) to cause the zonule fibers to relax

contract

13

What structure is responsible for refractive power?

the ANTERIOR curvature of the cornea

14

can we adjust the curvature of the cornea?

NO

15

can we adjust the curvature of the lens?

why, of course!

16

Presbyopia is the phenomenon of:

loss of accommodation with age

17

Myopia is more commonly known as;

nearsightedness

18

hyperopia is more commonly known as:

farsigthedness

19

myopia is a condition in which your eye is too (long/short) for your lens focal length?

long

20

hyperopia is a condition in which your eye is too (long/short) for your lens focal length?

short

21

What type of lens do you use to correct myopia?

concave (diverging) lens

22

what type of lens do you use to correct hyperopia?

convex lens

23

What is an astigmatism?

blurry vision due to irregular curvature of the cornea or lens--can be football shaped

24

The blind spot is the (blank), where there are no cones or rods

optic disc

25

What are the five cell types found in the retina?

1. Cones and rods
2. Bipolar cell
3. Horizontal cell
4. Amacrine cell
5. Ganglion cell

26

the cones and rods are the (deepest/most superficial) layer (as in closest to the light?

deepest

27

in what layer are the horizontal cells?

outer plexiform layer

28

are horizontal cells pre or post synaptic between bipolar cells and cones/rods?

presynaptic

29

are amacrine cells pre or post synaptic between bipolar cells and ganglion cells

postsynaptic

30

in what layer are the amacrine cells?

inner plexiform layer