A Random Dot E stereogram for the vision screening of children
R. S. Hammond and P. P. Schmidt
The purpose of school vision screenings is to detect those children with
vision problems that may impede normal development (eg, amblyopia,
refractive error, strabismus, suppression). In a double-blind
investigation, 483 schoolchildren, ranging in age from 5 to 13 years, had
their vision screened using both the Random Dot E (RDE) stereogram and the
Modified Clinical Technique (MCT). The validity of each technique was
determined using the phi coefficient and was compared with results of
similar reports in the literature for the Modified Clinical Technique,
Snellen letter acuity, and vision-screening kits. Our data show that the
RDE is more effective than five of six other techniques in identifying
those children who need further visual examination. In addition, screening
with the RDE can be taught to nonprofessionals in ten minutes or less, can
be completed on each child within two minutes, and is inexpensive.
