The authors assessed the utility of an electronic Dobson acuity card which can be altered for spatial frequency. Thirty-six infants and toddlers aged 5-36.7 months were recruited – equal females and males. Fourteen had high refractive error. The card is a handheld frame which holds two google nexus-7 tablets. One displays a square-wave grating and the other displays a uniform grey patch. During the test the displays change from one to the other. The frame is held at 55cm from the child. Mean visual acuity was significantly lower in the children with high refractive error compared to those with lower errors. The results suggest the Dobson card can differentiate those with minimal error to those with high refractive errors requiring further assessment. It warrants further research. 

Assessment of grating acuity in infants and toddlers using an electronic acuity card: The Dobson card.
Mohan KM, Miller JM, Harvey EM, et al.
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Fiona Rowe (Prof)

Institute of Population Health, University of Liverpool, UK.

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