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Updated: Aug 7, 2026
The Measurement and Treatment of Suppression in Amblyopia
Published on: December 14, 2012
Amblyopia treatment outcomes after screening before or at age 3 years: follow up from randomised trial
C Williams1, K Northstone, R A Harrad
1Division of Child Health, University of Bristol, Bristol BS8 1TQ. Cathy.Williams@bristol.ac.uk
Insights
Early screening for amblyopia (lazy eye) in children significantly reduces its prevalence and improves visual acuity by age 7.5. Intensive orthoptic screening protocols lead to better long-term outcomes compared to later screening.
Area of Science:
- Ophthalmology
- Pediatric Health
- Public Health Screening
Background:
- Amblyopia, or lazy eye, is a common cause of reduced vision in children.
- Early detection and intervention are crucial for effective amblyopia treatment.
- Current screening practices vary, with questions about optimal timing and intensity.
Purpose of the Study:
- To evaluate the effectiveness of an intensive early screening protocol for amblyopia in children.
- To compare visual outcomes in children receiving intensive versus delayed screening.
Main Methods:
- A randomized controlled trial involving 3490 children from a birth cohort in Avon, UK.
- Comparison of an intensive orthoptic screening schedule (at 8, 12, 18, 25, 31, 37 months) against a control group screened only at 37 months.
- Assessment of amblyopia prevalence and visual acuity at 7.5 years of age.
Main Results:
- Lower prevalence of amblyopia at 7.5 years in the intensive screening group (0.6%) versus the control group (1.8%).
- Significantly better mean visual acuity in the worse eye for treated children in the intensive group (0.15 LogMAR) compared to the control group (0.26 LogMAR).
- A higher proportion of children in the intensive group received hospital eye clinic care before age 3.
Conclusions:
- An intensive screening protocol for amblyopia is associated with reduced prevalence and improved visual acuity at age 7.5.
- Early detection and treatment of amblyopia yield better outcomes than later interventions.
- Findings support the development of feasible, early-stage screening programs for childhood amblyopia.
Objective:
To assess the effectiveness of early treatment for amblyopia in children.
Design:
Follow up of outcomes of treatment for amblyopia in a randomised controlled trial comparing intensive orthoptic screening at 8, 12, 18, 25, 31, and 37 months (intensive group) with orthoptic screening at 37 months only (control group).
Setting:
Avon, southwest England.
Participants:
3490 children who were part of a birth cohort study.
Main Outcome Measures:
Prevalence of amblyopia and visual acuity of the worse seeing eye at 7.5 years of age.
Results:
Amblyopia at 7.5 years was less prevalent in the intensive group than in the control group (0.6% v 1.8%; P=0.02). Mean visual acuities in the worse seeing eye were better for children who had been treated for amblyopia in the intensive group than for similar children in the control group (0.15 v 0.26 LogMAR units; P<0.001). A higher proportion of the children who were treated for amblyopia had been seen in a hospital eye clinic before 3 years of age in the intensive group than in the control group (48% v 13%; P=0.0002).
Conclusions:
The intensive screening protocol was associated with better acuity in the amblyopic eye and a lower prevalence of amblyopia at 7.5 years of age, in comparison with screening at 37 months only. These data support the hypothesis that early treatment for amblyopia leads to a better outcome than later treatment and may act as a stimulus for research into feasible screening programmes.
