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All registers are strictly population based. Despite identical classification routines the prevalence study demonstrated significant differences among the Nordic countries, as prevalence rates (all visual impairment categories) varied between 48\/100 000 and 105\/100 000. The corresponding blindness rates varied between 15\/100 000 and 41\/100 000. These differences were mainly ascribed to underregistration in the countries with the lowest rates","unstructured":"The present investigation also included the seven southernmost counties in Sweden where a register for visually impaired children was established in 1990.2 The Danish and Swedish registers are dedicated child registers while the remaining national blind registers comprise all age groups. All registers are strictly population based. Despite identical classification routines the prevalence study demonstrated significant differences among the Nordic countries, as prevalence rates (all visual impairment categories) varied between 48\/100 000 and 105\/100 000. The corresponding blindness rates varied between 15\/100 000 and 41\/100 000. These differences were mainly ascribed to underregistration in the countries with the lowest rates."},{"key":"ref_2","first-page":"145","article-title":"Visual impairment in Nordic children. I. Nordic registers and prevalence data","volume":"70","author":"Riise, R.; Flage, T.; Hansen, E.; Rosenberg, T.; Rudanko, S.-L.; Viggosson, G.","year":"1992","unstructured":"Riise R, Flage T, Hansen E, Rosenberg T, Rudanko S-L, Viggosson G, et al. Visual impairment in Nordic children. I. Nordic registers and prevalence data. Acta Ophthalmol (Copenh) 1992; 70: 145-54.","journal-title":"Acta Ophthalmol (Copenh)"},{"key":"ref_3","article-title":"Visual impairment in Swedish children. I. 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Sight Saving Rev 1972; 42: 69-89.","journal-title":"Sight Saving Rev"},{"key":"ref_12","first-page":"11","article-title":"Observations on the habilitation of children with cortical visual impairment. Vis Impair Blind","volume":"84","author":"Groenvald, M.; Jan, J.E.; Leader, P.","year":"1990","unstructured":"Groenvald M, Jan JE, Leader P. Observations on the habilitation of children with cortical visual impairment. Vis Impair Blind 1990; 84: 11-5."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"351","DOI":"10.1016\/0039-6257(94)90073-6","article-title":"Cortical visual impairment in children","volume":"38","author":"Good, W.V.; Jan, J.E.; DeSa, L.; Barkovich, J.; Groenvald, M.; Hoyt, C.S.","year":"1994","unstructured":"Good WV, Jan JE, DeSa L, Barkovich J, Groenvald M, Hoyt CS. Cortical visual impairment in children. 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