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June 1986

Random Dot E Stereogram

Arch Ophthalmol. 1986;104(6):799. doi:10.1001/archopht.1986.01050180029012

To the Editor.  —I enjoyed the article by Robert S. Hammond, OD, and Paulette P. Schmidt, OD, MS, entitled "Analysis of Random Dot E Stereograms for Vision Screening of Children" that appeared in the January 1986 issue of the Archives1. Indeed, I have used this test since Dr Robert Reinecke commented on its usefulness for this purpose in his 1974 article, noted as reference 10 in the artice by Drs Hammond and Schmidt.The test is based on the child choosing which of the two E cards indeed has the stereogram when he is wearing the polarized glasses and is shown both cards. Five correct choices in five tries could occur at random only 1:32, or 3.125% of the time. This would be a significant result at the 5% level of statistical significance since the probability of this event happening by chance alone is less than 5%.Drs Hammond