USING A SAMPLE OF 94 CHILDREN (31 TO 54 MONTHS OLD), THIS STUDY COMPARED EIGHT VISION SCREENING PROCEDURES FOR YOUNG CHILDREN IN THE ABILITY TO TEST FOR SEVERAL VISUAL FUNCTIONS, AND PREFERENCE AMONG THEM BY CHILDREN. THE SUBJECTS WERE ORIGINALLY TESTED USING THE EIGHT SCREENING TESTS, AND 6 MONTHS LATER 40 OF THE CHILDREN WERE RETESTED FOR CHANGES IN VISUAL ACUITY AND EYE DOMINANCE DURING THE INTERIM PERIOD. RESULTS INDICATED THAT THE RELATIVE SCREENING ABILITY OF THE PROCEDURES WAS UNDETERMINED FOR THE VISUAL FUNCTIONS OF VISUAL ACUITY, MUSCLE BALANCE, AND COLOR PREFERENCE, DUE TO NONTESTABILITY OF SIGNIFICANT NUMBERS OF THE SUBJECTS. THE RESULTS INDICATED THAT EYE DOMINANCE COULD BE ESTABLISHED. THE CONCLUSION SUGGESTS THAT PRESCHOOL CHILDREN 30 MONTHS OF AGE AND OVER CAN BE SCREENED, ALTHOUGH 50 PERCENT MAY BE NONSTABLE. THIS DOCUMENT IS AVAILABLE FROM THE SUPERINTENDENT OF DOCUMENTS, U.S. GOVERNMENT PRINTING OFFICE, WASHINGTON, D.C. 20402, FOR $0.45. (KH)