In 1966, a national survey reported on 8,887 multiply impaired (MI) blind children. About 56% were boys; 85% had been blind since before age 3, and half were totally blind. The principal causes of blindness were retrolental fibroplasia and congenital cataracts. Almost 63% had two or more additional disabilities (86.8% of those under age 6), such as mental retardation (80.2%), speech problems (38.9%), brain damage (35.1%), emotional problems (16.7%), cerebral palsy (14.4%), epilepsy (14.0%), chronic medical problems (7.0%), crippling (4.9%), hearing impairment (10.6%), cosmetic defect (6.1%), orthodontic defect (4.0%), and cleft palate (1.0%). Although half of the sample was 13 or older, only 4.4% functioned at secondary school level; 130 children were reported who had reading vision but used braille; the reported mobility performance data were found unreliable. The estimated number of MI blind children in the United States is 15,000 with 300 more diagnosed each year. Suggestions were made for research and services. (LE)