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Range from 1.0% to 3.2% among military recruits, to 0.5% to 3.5% in preschool and school-age children, to 4.0% to 5.3% in patients with ophthalmic problems (
Amblyopia due to visual deprivation develops more rapidly Deeper with an earlier Critical period for development than that due to strabismus or anisometropia
Due to relatively large receptive field associated with amblyopia..
Small angle tropia (monofixation syndrome) corneal opacity (peter s anomaly )
Other sensorial adaptations, such as suppression and ARC, are most likely to occur during the same age range as does amblyopia.
Incomitant strabismus (e.g., Duane’s syndrome and Brown’s syndrome)
Clinically similar to other forms of monocular nystagmus may occur in post fossa or brain stem disorder.
Sensory nystagmus is ass w/ B/L severe amblyopia, or cong blindness such as macular or optic nerve pathology. does not occur w/ cortical blindness because extrastriate visual pathways ant to occipital cortex supply fixation reflex. /l amblyopia and nystagmus will occur in dense B/L Cong opacities unless the image is cleared by 2 months of age.
Bilateral ptosis is not amblyopiogenic because the patient maintains normal visual activity with a chin elevation.
Wright figures tested two-point discrimination acuity, similar to Snellen acuity. Another advantage of the Wright figures is that their overall shape or footprint is similar for all figures, which prevents the child from determining the figure by the shape rather than internal two-point discrimination.
in esotropes fixation becomes more eccentric in abduction and less eccentric in adduction. If ocular motility is mechanically limited, distance b/w fixation area and foveola likely to increase. Similar considerations apply to increases in VA in various directions of gaze.