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Motility > Bino Vision > Flashcards

Flashcards in Bino Vision Deck (42):
1

3 things in order to have bino vision

-VA has to be similar in both eyes
-muscles must be able to move correctly
-images from each retina must be fused

2

What are the 3 things the motor system is responsible for?

-enlarging the field of view to make it a field of fixation
-bringing the image to the fovea and keeping it there
-maintaining the best single bino vision by aligning the 2 eyes.

3

Collection and integration of the information received at the retina, and transmitted to the cortex.

Sensory processing

4

What are some ways sensory processing could be affected?

-amblyopia
-uncorrected refractive error
-eccentric fixation
-disease

Basically anything that disrupts the integration of the images from the 2 eyes

5

Properly aligning the eyes at different distances and in different gazes.

Motor processing

6

T/F: if there is abnormalities in the sensory processing motor process doesnt suffer

False. It does suffer

7

Name 4 motor abnormalities

-disease
-deviations
-nystagmus
-vergence anomalies

8

Eye movements that occurs without awareness; there is stimuli from the visual, auditory or the vestibular systems and the eyes act accordingly. They are relative in nature.

Involuntary eye movements

9

T/F: involuntary eye movements depend on attention

True

10

The point at the center of the muscle or tendon that first touches the globe

Tangential point

11

This is the arc formed between the tangential point and the center of insertion of the muscle on the sclera.

Arc of contact

12

T/F: the arc of contact changes in length as a muscle contracts.

True

13

T/F: the arc of contact is longer when a muscle is relaxed and shorter when a muscle contracts.

True

14

Describes the direction of pull of the muscle and determines the axis the muscle will move around.

Muscle plane

15

The visual axis passes from the ___ to the _____

From the fovea to the point of fixation

16

T/F: The visual axis from both eyes intersect at fixation in normal binocular single vision.

True

17

The eye rotates vertically (up and down) on the ___ axis

X axis of Fick

18

The eye makes torsiona rotations like a wheel around the ___ axis

Y

19

The eye rotates horizontally on the ____ axis

Z

20

The imaginary line joining the insertions of the 4 rectus muscles.

Spiral of tillaux

21

Movers around the X axis

Vertical rectus muscles

22

Horizontal movers around the vertical Z axis

Horizontal rectus muscles

23

All rectus muscles arise from the ____

Annulus of zinn

24

CN3 innervates what muscles

MR, IO, IR, and SR

25

What innervated the LR

CN6

26

The medial rectus inserts __ from the nasal limbus

5.5mm

27

The lateral rectus inserts ___ from the temporal limbus

6.9mm

28

The medial and lateral walls are ___ degrees of each other.

The orbital axis is about ___ of the two walls

45

23

29

In primary gaze, the orbital axis is at ___of the visual axis.

23

30

The superior rectus inserts ___ from the superior limbus

7.7mm

31

What are the actions of the SR?

1-elevation
2-intortion
3-adduction

32

What are the actions of the IR?

1-depression
2-extortion
3-adduction

33

The IR inserts ___ behind the inferior limbus

6.5mm

34

The oblique muscles insert behind the equator at ___ angle with the visual axis

51

35

What are the actions of the superior oblique

1-intortion
2-depression
3-abduction

36

What innervates the SO?

CN4

37

Originates from the orbital apex above the annulus of Zinn, passes superiorly and upward along the superomedial wall.

Superior oblique

38

What are the actions of the IO?

1-extortion
2-elevation
3-abduction

39

When the globe is abducted 39 degrees, the angle between the visual axis and the superior oblique make an angle of 90 degrees with each other –
the superior oblique acts only as an ____

Intortor

40

When the globe is abducted 39 degrees, the angle between the visual axis and the inferior oblique make an angle of 90 degrees with each other –
the inferior oblique acts only as an _____

Extortor

41

The orbital axis is from the

Apex of the orbit to the opening of the orbit

42

How far can the eye move? And at what degree does the head turn?

~50 degrees and at 20 degrees the head turns