Aim To evaluate consecutive measurements of the biometric parameters,
age, and refraction error in a Turkish population at primary school age.
Materials and Methods A total of 197 children aged between 7-12 years
were included. The data of three consecutive measurements of children,
who were examined at least once a year for three years using both
cycloplegic auto-refractometry and optical biometry, were used in this
retrospective study. Spherical equivalent <-0.50D was
considered to be myopic; >+0.75D was considered to be
hypermetropic. Age, gender, body mass index, spherical equivalent, axial
length, anterior chamber depth, central corneal thickness, keratometry,
and lens thickness were analyzed. The onset data obtained in 2013
whereas, the final data were from 2015. Logistic and Cox regression
analyses were performed (p<0.05). Results The mean of the
onset and the final spherical equivalents were 0.19D (0.56), and 0.08D
(0.80), respectively. The myopia prevalence was increased among
refractive errors in observation periods (univariable analysis p=0.029;
multivariable analysis p=0.017). The onset axial length (HR:4.55,
95%CI:2.87-7.24, p<0.001), keratometry (HR:2.04,
95%CI:1.55-2.67, p<0.001) and age (HR:0.73, 95%CI:
0.57-0.92, p=0.009) correlated myopia progression. To calculate the
estimated spherical equivalent, the onset data were included in the
logistic regression model. The onset data of spherical equivalent
(β=0.916, p<0.001), axial length (β=-0.451,
p<0.001), anterior chamber depth (β=0.430, p=0.005) and
keratometry (β=-0.172, p<0.001) were found to be significantly
associated with the mean SE at the final data. Conclusions To calculate
the estimated spherical equivalent following three years, an equation
was proposed. The estimated refractive error of children can be
calculated by using the proposed equation with the associated onset
optical parameters.
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