Binocular Vision 2 - Week 2 Flashcards Preview

OD1 Semester 2 - Integrated Ophthalmic Sciences and Preclinical Optometry > Binocular Vision 2 - Week 2 > Flashcards

Flashcards in Binocular Vision 2 - Week 2 Deck (11)
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1
Q

Define Vergence

A

simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision

2
Q

What stimulates vergence eye movements?

A

displacement or movement of a target toward or away from the subject

3
Q

What anatomical factors can influence vergence?

A
  • size of globe
  • shape of globe
  • position of EOM insertion
4
Q

What neurological factors can influence vergence?

A

Any lesions affecting innervation of cranial nerves III, IV, VI

5
Q

What general factors can influence vergence?

A
  • fatigue
  • alcohol
  • tobacco
  • medications
  • prism in glasses
  • FAT PM *
6
Q

Name 6 types of vergence responses

A
  • fusional/disparity
  • proximal awareness
  • accommodation
  • tonic
  • voluntary (convergence)
  • vergence adaptation
7
Q

Describe vergence/eye position in tonic conditions

A

Slightly eso posture

8
Q

What features of vergence function can we measure clincally? and how can we test these?

A

Vergence posture - heterophoria
Vergence ranges - PRC, NRC
Vergence facility - BI, BO challenge flippers
NPC - combined skill test

9
Q

What tests can we use to measure vergence posture?

A
Prentice Card
Von Graefe
Maddox Rod/modified thorington technique
Cover test
Maddow wing
10
Q

Are PRC and NRC measured with a phoropter or in free space?

A

Can be either

11
Q

What base power prism flippers do we use when testing vergence facility?

A

12 base out and 3 base in

Decks in OD1 Semester 2 - Integrated Ophthalmic Sciences and Preclinical Optometry Class (49):