Week 1.01 Introductory Lecture

Question 1

For fusion to occur the images must be located on corresponding retinal areas but also must be similar in :

Answer 1

• Size
• Brightness
• sharpness

Question 2

Sensory fusion

Answer 2

The combination of corresponding retinal images into a single visual perception

Question 3

Motor fusion

Answer 3

The ability to align the eyes in such a manner that sensory fusion can take place

Question 4

Diplopia

Answer 4

When non-corresponding points in two eyes are stimulated by the same object double vision occurs

Question 5

Disparity

Answer 5

Small horizontal differences between images in the two eyes that are still fusible

Question 6

What are the requirements for stereopsis

Answer 6

Binocular overlap
Partial degustation
Coordinated eye movements

Question 7

What are the 4 conjugate eye movements

Answer 7

Saccades - quick
Pursuit - following moving object
Vestibular reflexes - moving your head
Vergences - divergence convergence

Question 8

Manifest deviation

Answer 8

Also known as tropia, this is a deviation that can be detected with both eyes open. It can be constant or intermittent, and can affect one or both eyes.

Question 9

Latent deviation

Answer 9

Also known as phoria, this is a deviation that can only be detected when one eye is covered. The brain corrects minor misalignments in latent deviations using the extraocular muscles