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Early screening for amblyogenic risk factors lowers the prevalence and severity of amblyopia
M Eibschitz-Tsimhoni1, T Friedman, J Naor
1Department of Ophthalmology, Kellogg Eye Center, University of Michigan, Ann Arbor 48105, USA. mayae@umich.edu
Insights
Infant mass screening for amblyopia significantly reduces its prevalence and severity. Early detection and treatment in children lead to better visual outcomes, highlighting the program
Area of Science:
- Ophthalmology
- Public Health
- Pediatrics
Background:
- Amblyopia, or 'lazy eye', is a leading cause of visual impairment in children.
- Early detection and intervention are crucial for effective treatment of amblyopia.
- Mass screening programs aim to identify infants at risk for amblyopia and related conditions.
Purpose of the Study:
- To evaluate the effectiveness of a systematic infant mass screening program for amblyopia and its risk factors.
- To compare the prevalence and severity of amblyopia in children who underwent early screening versus those who did not.
Main Methods:
- A comparative study involving 8-year-old children in Haifa (screened in infancy) and Hadera (not screened).
- Screening included assessment for amblyopia (defined by corrected visual acuity) and risk factors.
- Data collected on referral rates, treatment rates, and the diagnostic accuracy of the screening test.
Main Results:
- The prevalence of amblyopia was significantly lower in the screened group (1.0%) compared to the unscreened group (2.6%).
- Severe amblyopia (< or =5/15 acuity) was markedly reduced in screened children (0.1% vs. 1.7%).
- The screening program demonstrated high sensitivity (85.7%) and specificity (98.6%) for detecting amblyopia.
Conclusions:
- Infant mass screening for amblyopia and its risk factors is effective in reducing prevalence and severity.
- The program's success underscores the importance of early detection and timely treatment for optimal visual development.
- Systematic screening contributes to better long-term visual health outcomes in the pediatric population.
Purpose:
To evaluate the efficacy of a mass screening program for amblyopia and amblyogenic risk factors in infants.
Methods:
Since 1968, children between the ages of 1 and 2(1/2) years in the city of Haifa, Israel, have been systematically screened for amblyopia and amblyogenic risk factors. The screening is performed by the Ophthalmology Department of Bnai-Zion Medical Center (formerly known as Rothchild Hospital). In 1995, we compared the prevalence and severity of amblyopia in two populations of 8-year-old children in elementary school: one group was a cohort of 808 children from the city of Haifa and its vicinity, who had been screened in infancy (between 1988 and 1990); and the second group, the control group, was a cohort of 782 children from Hadera and its vicinity, where this early screening program is not conducted. Amblyopia was defined as corrected visual acuity of < or =5/10 (20/40), or >1 line difference in corrected visual acuity between the two eyes. Referral rate, treatment rate, sensitivity, specificity, and positive predictive value and negative predictive value of the screening test in detecting factors that later resulted in the development of amblyopia were examined.
Results:
The prevalence of amblyopia in the 8-year-old population screened in infancy was found to be 1.0% compared with 2.6% in the 8-year-old population that had not been screened in infancy (P =.0098). The prevalence of amblyopia with visual acuity of < or =5/15 (20/60) in the amblyopic eye was 0.1% in the screened population compared with 1.7% in the non-screened population (P =.00026). In the screened infant population, 3.6% were referred from the screening examination to a confirmatory examination and 2.2% were treated. The screening examination had a sensitivity of 85.7% and a specificity of 98.6% for amblyopia. The positive predictive value of the screening examination was 62.1% and the negative predictive value was 99.6%.
Conclusions:
The screening program for amblyopia and amblyogenic risk factors in infants, followed by appropriate treatment, is effective in significantly reducing the prevalence and severity of amblyopia in children.