Table 2

Inclusion criteria
Population Children with Normal Vision up to 18 years
Children and Adults with Visual Impairment
Children with Cerebral Visual Impairment up to 18 years
Adults with amblyopia (addressed for 2 intervention studies)
Intervention Progress on crowding tasks after Perceptual Learning intervention (n=7)
Type of study Randomized controlled trials (n=0)
Non-randomized intervention studies (n=4)
Cohort studies (n=3)
Case - control studies (n=4)
Cross - sectional studies (n=11)
Outcome measurements Contour interaction area (n=7)
Crowding ratio (n=8)
Effects of Perceptual Learning on crowding (n=7)

Huurneman et al.

Huurneman et al. BMC Ophthalmology 2012 12:27   doi:10.1186/1471-2415-12-27

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