The free Peekaboo App is an accurate way of measuring visual acuity, as this 30 second film explains:
This app is particularly useful with very young or more complex children who are unable to point or reach out, as one can learn to observe by watching their eye movement (as the film demonstrates).
The app is free and available to download onto iPads in the UK, link here.
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At CVI Scotland we are devoted to helping people understand cerebral visual impairments, and together working towards developing the understanding of this complex condition.