strabismus

Question 1

What are ductions?

Answer 1

They are movements of one eye

Question 2

What are versions?

Answer 2

This is when both eyes move in the same direction

Question 3

What is vergence?

Answer 3

When the eyes move in opposite directions

convergence

divergence

Question 4

What are yoke muscles?

Answer 4

superior rectus and inferior oblique

Question 5

What is strabismus?

Answer 5

Misalignment of the visual axis

Question 6

What is esotropia?

Answer 6

The deviant eye turns inwards

Question 7

Define Exotropia

Answer 7

The deviant eye turns outward

Question 8

Define hypertropia?

Answer 8

The deviant eye turns upwards

Question 9

Define hypotropia

Answer 9

The deviant eye turns downwards

Question 10

What is incomitant strabismus?

Answer 10

It is when strabismus involves impairment of one or more eye movements

Question 11

What is comitant strabismus?

Answer 11

It is when there is no impairment of eye movement

Question 12

What are the causes of incomitant strabismus?

Answer 12

1. vranial nervefallout- CN III,IV,VI
2. myasthenia gravis
3. thyroid orbitopathy
4. blow out fracture and orbital mass

Question 13

What are te names of CN III, IV, VI?

Answer 13

1. CN III- oculomotor
2. CN IV-trochlear
3. CN-abducens

Question 14

What are the two tests for testing strabismus?

Answer 14

1. The corneal light reflex test
2. Cover test

Question 15

Why do we need to urgently refer children with concomitant strabismus?

Answer 15

To correct the amblyopia

To reduce the chance of retinoblastoma

Question 16

What are the posible causes of incomitant strabismus??

Answer 16

Intracranial tumours and aneurysms

Question 17

What are the possible ways to treat diplopia?

Answer 17

spectacle prism

frosted spectacle lens

occlusion