Amblyopia

Question 1

Mechanism of amblyopia

Answer 1

Deprevation of vision form:
- can be partial or complete
- complete: no image / stimulus reaches the fovea
- partial: degreaded image reaches the fovea

Abnormal binoc interaction
- incomplete image falls on the retina
- images are incmplete
- eyes compete for control over cortical connection during developing peroid - better eye gains control

Question 2

Types

Answer 2

strabismic
anisometropic
Stimulus deprevation
meridional
ametropic

Question 3

Strabiusmic amblyopia

Answer 3

constangt / near - constsant childhood stabs in 1 eye

Question 4

anisometropic

Answer 4

Sig anisometropia present ( atleat 1D in difference)

Question 5

stimulus deprevation

Answer 5

causes include congenital cataracts,ptosis, corneal scars ect

Question 6

meridional

Answer 6

Mod / High degree of uncorrected astigmatism

Question 7

ametropic

Answer 7

high degree of bilateral ref error

Question 8

management

Answer 8

initially px is perscribed full refractive correction for full time wear
- minimum of 18 weeks
- can take up to 30 weeks for improvement

Question 9

occlusion treatment

Answer 9

mod amblyopia - 0.3-0.6 logMAR
- 2-6 hours < 7 year old

Severe amblyopia - 0.7>
- full time occlusion

atropine penalisation also possible:
- instilled 2 consequetive days per week

optical penalsiation
- +3.50 added to non-amblyopic eye and a full correction at near