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The infant aphakia treatment study: design and clinical measures at enrollment
Insights
The Infant Aphakia Treatment Study compared contact lenses and intraocular lenses (IOLs) for correcting unilateral aphakia in infants after cataract surgery. The study aimed to determine which optical treatment yields better visual outcomes for infants with congenital cataracts.
Area of Science:
- Ophthalmology
- Pediatric ophthalmology
- Refractive error correction
Background:
- Unilateral aphakia in infancy, often resulting from congenital cataracts, presents a challenge for visual development.
- The optimal method for optical correction in these cases remains uncertain, impacting long-term visual outcomes.
- Early intervention is crucial for managing visual impairment in infants.
Purpose of the Study:
- To compare the effectiveness of contact lenses versus intraocular lenses (IOLs) for optical correction in infants with unilateral aphakia.
- To provide empirical evidence to guide the optimal optical treatment choice after unilateral cataract surgery in infancy.
- To assess visual outcomes associated with different aphakia correction methods.
Main Methods:
- A randomized, multicenter clinical trial involving 114 infants with unilateral congenital cataracts.
- Infants were assigned to either intraocular lens (IOL) implantation with spectacle correction or contact lens correction for aphakia.
- Primary outcome measures included grating acuity at 12 months and HOTV visual acuity at 4.5 years.
Main Results:
- The study enrolled infants with a median age of 1.8 months at cataract surgery.
- Axial lengths were shorter and corneas steeper in eyes with cataracts compared to fellow eyes.
- The trial was conducted across 12 sites with balanced randomization to treatment groups.
Conclusions:
- The optimal optical management for unilateral aphakia in infants following cataract surgery is not definitively established.
- This study provides empirical data to inform the choice between contact lenses and IOLs for better visual outcomes.
- Further analysis is needed to determine the long-term visual benefits of each treatment modality.
Objective:
To compare the use of contact lenses and intraocular lenses (IOLs) for the optical correction of unilateral aphakia during infancy.
Methods:
In a randomized, multicenter (12 sites) clinical trial, 114 infants with unilateral congenital cataracts were assigned to undergo cataract surgery with or without IOL implantation. Children randomized to IOL treatment had their residual refractive error corrected with spectacles. Children randomized to no IOL treatment had their aphakia treated with a contact lens.
Main Outcome Measures:
Grating acuity at 12 months of age and HOTV visual acuity at 4 1/2 years of age.
Application To Clinical Practice:
This study should determine whether either treatment for an infant with a visually significant unilateral congenital cataract results in a better visual outcome.
Results:
Enrollment began December 23, 2004, and was completed January 16, 2009. The median age at the time of cataract surgery was 1.8 months. Fifty patients were 4 to 6 weeks of age at the time of enrollment; 32, 7 weeks to 3 months of age; and the remaining 32, more than 3 to less than 7 months of age. Fifty-seven children were randomized to each treatment group. Eyes with cataracts had shorter axial lengths and steeper corneas on average than the fellow eyes.
Conclusions:
The optimal optical treatment of aphakia in infants is unknown. However, the Infant Aphakia Treatment Study was designed to provide empirical evidence of whether optical treatment with an IOL or a contact lens after unilateral cataract surgery during infancy is associated with a better visual outcome.