Aetiology
Causes include:
- strabismus - normal acuity develops in the eye used habitually for fixation, amblyopia in the non-preferred eye. This is most common in esotropia and rare in exotropia and hypertropia. It does not usually occur if there is spontaneous alternation of fixation.
- anisometropia; the eye with the greater refractive error is at risk of amblyopia.
- combined strabismic and refractive
- less commonly
- ametropia- if refractive error is large and symmetrical, may cause bilateral amblyopia
- stimulus deprivation(rare) - amblyopia results from interruption of the formation of an image on the retina:
- unilateral
- monocular cataract
- ptosis
- hyphaema
- opaque cornea
- cloudy vitreous
- iatrogenic - prolonged patching or prolonged atropine eyedrops
- bilateral
- nystagmus
- cataract
- unilateral
Reference:
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