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Updated: May 18, 2026
The Measurement and Treatment of Suppression in Amblyopia
Published on: December 14, 2012
Characterization of bangerter filter effect in mild and moderate amblyopia associated with strabismus
Insights
Bangerter filters effectively improved vision in children with amblyopia (lazy eye) due to strabismus. Maintaining ocular dominance is key for optimal outcomes in this strabismic amblyopia treatment.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Vision Science
Background:
- Amblyopia, often associated with strabismus, presents a significant challenge in pediatric vision development.
- Mild to moderate amblyopia requires effective treatment strategies to prevent long-term visual impairment.
Purpose of the Study:
- To evaluate the efficacy of Bangerter filters in treating amblyopia associated with strabismus in children.
- To assess the impact of Bangerter filters on visual acuity and ocular dominance.
Main Methods:
- A prospective study involved 30 children (2-9 years) with unilateral amblyopia, esotropia, and hyperopia.
- Bangerter filters were applied to the non-amblyopic eye, reducing visual acuity by two lines below the amblyopic eye's best spectacle-corrected visual acuity (BSCVA).
- Treatment combined filters with refractive correction, followed for 12 months.
Main Results:
- Statistically significant improvements in BSCVA were observed in amblyopic eyes at 3, 6, 9, and 12 months.
- BSCVA in non-amblyopic eyes remained stable initially, showing significant improvement at 9 months.
- Filter density adjustments were needed in 40% of cases; inverse correlations found between baseline filter density and final BSCVA.
Conclusions:
- Bangerter filters demonstrate utility in treating mild to moderate strabismic amblyopia.
- Maintaining appropriate ocular dominance during treatment is crucial for optimizing visual outcomes.
Background:
To evaluate the outcome achieved by using Bangerter filters in cases of mild to moderate amblyopia associated to strabismus.
Methods:
Prospective study comprising 30 children (age range 2-9 years) with unilateral mild to moderate amblyopia associated to esotropia and hyperopia. All patients were treated by prescribing the use of a Bangerter filter in the non-amblyopic eye in combination with the refractive correction. In all cases, the filter selected induced a reduction of the visual acuity of 2 lines below the best spectacle-corrected visual acuity (BSCVA) of the amblyopic eye. A follow-up of 12 months was completed.
Results:
A statistically significant improvement in BSCVA was observed at 3 months in amblyopic eyes (p 0.01), with additional significant improvements at 6, 9 and 12 months (p 0.02). The BSCVA in non-amblyopic eyes remained unchanged during the initial 6 months of treatment (p 0.52), with a significant improvement at 9 months (p=0.03). Significant differences between amblyopic and fellow eyes were only detected at 3 months (p 0.01). Filter density had to be changed during the follow-up in 12 eyes (40%). Inverse significant correlations between baseline filter density and BSCVA were found at the end of the follow-up (r -0.35, p 0.01). A significant correlation of the visual acuity with the baseline visual acuity difference among eyes was only present at 3 months (r=-0.55, p 0.01).
Conclusions:
Bangerter filters seem to be useful for treating mild or moderate amblyopia due to strabismus, but ocular dominance inversion should be maintained during treatment for obtaining an optimized outcome.
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