WORK AND DISABILITY AT THE AGE OF 30 YEARS

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Abstract
The study is based on a cohort of 1570 persons consisting of all live births in 1940 of mothers then residing in Bergen, Norway. A sample was taken of the cohort after stratification according to type of school attended at the age of 14 yr. The sample was supplemented with persons who attended Special Schools for the enducable mentally retarded or received care from National Services for the mentally retarded. The final sample consisted of 262 persons. Persons in the sample were examined neurologically, and the results of these examinations formed the basis for further ophthalmological examinations. The frequency of visual impairment in the cohort at the age of 30 yr, according to relatively strict criterion, is estimated at 4.6% .+-. 2.0%. The frequency increased with a lower level of education (type of school) and decreasing IQ-points. Pathology of the eye was found most frequently among members of the services for the mentally retarded and was associated with encephalopathy.