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Preschool vision screening for amblyopia and strabismus. Programs, methods, guidelines, 1983
Insights
Early detection of amblyopia and strabismus in children is crucial. Current preschool vision screening in the US is insufficient, with only 21% of children screened, necessitating improved methods and guidelines.
Area of Science:
- Ophthalmology
- Pediatric Health
- Public Health
Background:
- Amblyopia and strabismus affect at least 5% of children, requiring early intervention for optimal visual outcomes.
- Many children receive delayed or no treatment for these conditions.
- Effective preschool vision screening is vital to address this public health issue.
Purpose of the Study:
- To assess the current status of preschool vision screening programs in the United States.
- To review existing screening guidelines and their impact on referral rates.
- To evaluate appropriate vision screening methods for young children.
Main Methods:
- Conducted on-site visits, mail questionnaires, and telephone interviews to study federal, state, and private screening programs.
- Reviewed existing screening guidelines and referral criteria.
- Assessed vision screening methods suitable for preschoolers and infants.
Main Results:
- An estimated 21% or fewer preschool children receive any vision screening.
- Only Michigan and Minnesota have legislated screening requirements.
- Current guidelines may lead to underreferrals, indicated by lower prevalence rates than actual.
Conclusions:
- There is a significant gap in preschool vision screening coverage in the US.
- Existing guidelines may be inadequate, leading to underdiagnosis.
- Stereoscopic testing shows promise for amblyopia and strabismus screening, but further research is needed.
Abstract:
Amblyopia and strabismus, which afflict at least 5% of children, require treatment early in life for best visual results. At present, many such children are treated late or not at all. Mass screening at preschool age, and perhaps ultimately of infants, appears the only viable solution to this problem. To ascertain the present status of preschool screening in the United States, on-site visits, mail questionnaires and telephone interviews were used to study existing preschool vision screening programs at the federal, state and private organization levels. We estimate that, at most, 21% of preschool children receive any form of vision screening. Only two states, Michigan and Minnesota, have legislated requirements for such screening. Several organizations have attempted to establish screening guidelines, with suggestions of specific test and referral criteria. These guidelines are reviewed. The guidelines are of particular interest because screening programs following them typically indicate far lower prevalence rates than most studies indicate actually exist, suggesting that the guidelines result in underreferrals. In order to assess this matter, vision screening methods appropriate for preschoolers or infants, based on current evidence, are reviewed. Stereoscopic testing, utilizing a random dot stereogram format, appears the best instrument available for amblyopia and strabismus screening, but large scale comparative studies of the different test methods are needed to arrive at a final determination. Suggestions are made for the physician interested in initiating preschool vision screening programs.
