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The incidence of notification for childhood visual impairment varied significantly by birth year, highlighting the impact of congenital and neonatal conditions. Further research into specific causes is crucial for effective prevention strategies.
Area of Science:
- Ophthalmology
- Pediatrics
- Epidemiology
Background:
- Childhood visual impairment presents a significant public health concern.
- Understanding the epidemiology of visual impairment is essential for developing targeted interventions.
- The Danish National Register for Visually Impaired Children serves as a key data source.
Purpose of the Study:
- To analyze the incidence and etiological factors of visual impairment in children.
- To investigate the anatomical location and associated handicaps related to visual impairment.
- To evaluate the utility of an epidemiological method for planning prevention strategies.
Main Methods:
- Cross-tabulation of ophthalmological diagnoses with demographic and etiological data.
- Calculation of 'incidence of notification' (IN) per birth year group.
- Analysis of the relationship between etiology and additional handicaps.
Main Results:
- The incidence of notification varied widely, with higher rates in more recent birth year groups, emphasizing congenital and neonatal factors.
- Approximately 90% of blinding causes involved the posterior segment, optic pathways, or brain.
- 38% of cases lacked a specific identifiable etiology, and 48% had central nervous system involvement.
Conclusions:
- The presented epidemiological method is valuable for planning preventive strategies for childhood visual impairment.
- Future efforts should focus on increasing diagnostic specificity and identifying specific etiologies.
- Targeted interventions are needed, particularly for congenital and neonatal visual impairments.
Abstract:
In 1985 150 children aged 0-18 were reported to the Danish National Register for Visually Impaired Children. Cross tabulation of the ophthalmological diagnoses by site and type of affection was performed with respect to year of birth, aetiology, visual acuity and birth weight. Finally the relations between aetiology and the presence of additional handicaps are demonstrated. The 'incidence of notification' (IN) was calculated for each birth year as the number of notified children per 100,000 within each birth year group showing variations between 46 in the 1984 birth year group and 3 in the 1970 birth year group with a mean value of 14. The figures stress the impact of congenital and neonatal visual impairment. The significance of IN is discussed with respect to other concepts of incidence. It is concluded that the presented epidemiological method is useful as a tool of analysis in the planning of preventional strategies. From the tables the following main features may be highlighted: Nearly 90% of the blinding causes anatomically are located in the posterior segment of the eye, the optic pathways or in the brain. Isolated visual handicap was notified in 34% of the children, while another 48% presented central nervous system involvement. From an aetiological point of view it is noteworthy that no specific aetiology could be encircled in 38% of the material. In conclusion, it is proposed that future lines of ophthalmological work in the prevention of visual handicap in childhood should concentrate on a higher degree of specificity in diagnostic procedures and an intensified search for specific aetiologies in every single child with visual impairment.