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This study was designed and undertaken to compare the results obtained from the SPOT vision screener and PlusOptix vision screener versus manual screening results in preschool children. Manual screening used LEA symbols and stereo butterfly tests. Over a three-month period, 1085 preschool children underwent screening at 24 sites. Average age was 48.8 ±7.2 months. Female to male ratio was 51:49. Based on screening criteria, 76.3% passed, 15.3% failed and 8.4% could not be screened. Photo screening was performed on 418 of 1085 children. One hundred and seventy passed this screening, 164 failed and 84 could not be tested. Of 170 who passed photo screening, 140 passed, 23 failed and seven could not be tested with PlusOptix whilst 158 passed, 11 failed and one could not be tested with SPOT. Of 164 who failed photo screening, 57 passed, 96 failed and 11 could not be tested with PlusOptix, whilst 64 passed, 11 failed and four could not be tested with SPOT. These results informed a sensitivity of 65.2% (CI 57.7 to 72.1) for PlusOptix and 61.0% (CI 53.2 to 68.1) for SPOT; non-significant differences. Specificity was 82.4% (CI 75.9 to 87.3) for PlusOptix and 92.9% (CI 88.1 to 95.9) for SPOT; SPOT specificity was significantly better. The authors conclude that photo screeners gave numerous false positive results and some false negatives. However, they are of particular use when able to screen children who could not be manually tested.

A comparative study of two photo screening devices with manual vision screening involving preschool children.
Musch DC, Andrews CA, Schumann RA, Baker JD.
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Fiona Rowe (Prof)

Institute of Population Health, University of Liverpool, UK.

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