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This atudy was carried out with the 'oint support of the National S d e t p for the Prevention of Blindnese, the Children's Bureau of the Federal Security Agency, the Division of Health of the State of Missouri, the St. h u m Board of Education the De artment of Ophthalmology, Waahington University School of Medicine, an8 the Office of Naval Research. (Continusd from J a m ) The Ortho-Rater, Sight-Screener and Telebinocular Tests correctly referred 23 to 25 per cent of the sixth-grade students, or about three-fourths of the 31 per cent referred by the ophthalmolo-gist. This is a high proportion of correct referrals as compared with most of the other procedures. But these tests referred incorrectly an even larger number of students, about 30 per cent of all sixth-grade students. The total referrals amount to at least half the students tested. When the manufacturer's standard for. referral is used with the Telabinocular, correct referrals of sixth-grade students are about the same as those by the Ortho-Rater and Sight-Screener, but there are slightly more incorrect referrals. With the Study standard, the correct and incorrect referrals are both in about the same proportion as those by the Ortho-Rater and Sight-Screener.Telebinocular testing of first-grade students by the technician &ave results very similar to those he obtained for sixth grade, but with somewhat fewer incorrect referrals, especially when the Study standard for referral is used. The nurse's Telebinocular Test referred many more students from first grade than the technician's, and most of these were incorrect referrals.The difference between the results obtained by the nurse and those obtained by the technician suggests that Telebinocular t e s t ing of first-grade students can only be done efficiently by an experienced tester.The combination of three procedures-high standard Near Vision Test, high standard Snellen Test, and Teacher JudgmenG gives results similar to those obtained with the Ortho-Rater, Sight-Screener, and Telebinocular. About three-fourths of the students who need care are referred, but the number of incorrect referrals exceeds the correct referrals. Incorrect referrals of first-grade stu-* Deceased.

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