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Study: environmental factors predominate genesis of myopia
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PHOENIX – According to a poster presentation here at Academy 2012, there was no association between near work-induced transient myopia characteristics in school-age children and the refractive error apparent in their parents, suggesting that environmental factors play an important role in the causative factors behind the children’s myopia.
The study included 359 children between the ages of 7 and 17. Primary outcome measures were near work-induced transient myopia (NITM), overall decay time and the decay time constant.
Measurements for the outcomes were assessed monocularly immediately after performing a sustained near-vision task for 5 minutes.
The parental refractive error was obtained by autorefraction or via recently documented history of refractive state.
“The odds ratio for incomplete decay of NITM did not change significantly with either an increase in the number of myopic parents or the magnitude of parental myopia,” the poster authors, led by Balamurali Vasudevan, BSOptom, MS, FAAO, wrote.
NITM was classified into low (less than 0.15 D), moderate (0.15 D to 0.30 D) or high (greater than or equal to 0.30 D), whereas decay time was classified as “complete” or “incomplete.”