Abstract
Purpose :
(1)To assess the prevalence and characteristics (age, the proportion of total measured myopia and the degree) of pseudomyopia in a population-based cohorts of Chinese children. (2) to investigate the effect of pseudomyopia degree on myopia progression in one year.
Methods :
This is a prospective, population-based study.Children are from randomly-selected secondary schools in Anyang, China.Comprehensive eye examinations including cycloplegic autorefraction were performed on consenting. Non-cycloplegic and cycloplegic autorefraction was performed at baseline, and at 1 year follow-up. Pseudomyopia was defined as spherical equivalent refractive error(SER)≤−0.50 D before cycloplegia and >−0.50 D after cycloplegia.
Results :
At 12 months there were 2323 young children (88.6%) and 1646 older children (83.0%) with cycloplegic refraction data. The prevalence of pseudomyopia were 24.1% in 6-year-old children and 18.9% in 13-year-old children. Pseudomyopia degree (defined as non-cycloplegic SE subtracted from cycloplegic SE) were 1.125D(0.625, 1.625) in 6-year-old children and 0.375D(0.125, 0.875) in and 13-year-old children. (P<0.001, t test). In both younger and older children, baseline SER had the strongest effect on the degree of pseudomyopia, children with more hyperopic SER had more pseudomyopia degree. (P<0.001) We did not observe a significant association of pseudomyopia degree between time spent in near work, time outdoors, gender and age. (P>0.05) Myopia progression in pseudomyopia chidlren was associated with whether wearing spectacles and pseudomyopia degree. (P<0.01)
Conclusions :
Pseudomyopia is more common in younger children. Children with more hyperopic SER had more pseudomyopia degree. Higher pseudomyopia degree have higher rate of myopia progression, though the correlation rate is small. Myopia progression rate is much more correlated with children's baseline refractive error.Pseudomyopia children should not wear spectacles.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.