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Accommodative instability: relationship to progression of early onset myopia
Trine Langaas1, Patricia M Riddell
1Department of Optometry and Visual Science, Buskerud University College, Kongsberg, Norway. Trine.Langaas@hibu.no
Clinical & Experimental Optometry
|January 31, 2012
Summary
Children with myopia exhibit greater accommodative instability, which weakly predicts myopia progression. Further research is needed to establish a causal link between accommodative instability and myopia development in children.
Area of Science:
- Ophthalmology
- Pediatric Optometry
Background:
- Previous correlational study indicated higher accommodative instability in children with early-onset myopia compared to emmetropic children.
- Causal relationship between accommodative instability and myopia progression remained undetermined.
Purpose of the Study:
- To investigate if accommodative instability at baseline predicts refractive error and myopia progression over two years.
- To establish a potential causal link between accommodative instability and the development of myopia in children.
Main Methods:
- Longitudinal study involving 13 myopic and 16 emmetropic children followed for two years.
- Dynamic accommodation measures using eccentric photorefraction at varying accommodative demands (0.25m, 0.5m, 4.00m).
Main Results:
- Accommodative instability and refractive error at Visit 1 strongly correlated with measures at Visit 2.
- Myopic children displayed significantly greater accommodative instability (0.38 D) than emmetropic children (0.26 D) at a 4.00 D demand.
- Accommodative instability at Visit 1 showed a weak predictive relationship with myopia progression.
Conclusions:
- Accommodative instability is associated with myopia progression in children.
- A definitive causal relationship between accommodative instability and myopia progression could not be established in this study.
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