Abstract
Purpose:To investigate the association between ocular biometrics such as axial length (AL), anterior chamber depth (ACD), lens thickness (LT), vitreous chamber depth (VCD) and corneal power (CP) with different refractive errors.Methods:In a cross-sectional study on the 40 to 64-year-old population of Shahroud, random cluster sampling was performed. Ocular biometrics were measured using the Allegro Biograph (WaveLight AG, Erlangen, Germany) for all participants. Refractive errors were determined using cycloplegic refraction.Results:In the first model, the strongest correlations were found between spherical equivalent with axial length and corneal power. Spherical equivalent was strongly correlated with axial length in high myopic and high hyperopic cases, and with corneal power in high hyperopic cases; 69.5% of variability in spherical equivalent was attributed to changes in these variables. In the second model, the correlations between vitreous chamber depth and corneal power with spherical equivalent were stronger in myopes than hyperopes, while the correlations between lens thickness and anterior chamber depth with spherical equivalent were stronger in hyperopic cases than myopic ones. In the third model, anterior chamber depth + lens thickness correlated with spherical equivalent only in moderate and severe cases of hyperopia, and this index was not correlated with spherical equivalent in moderate to severe myopia.Conclusion:In individuals aged 40-64 years, corneal power and axial length make the greatest contribution to spherical equivalent in high hyperopia and high myopia. Anterior segment biometric components have a more important role in hyperopia than myopia.
Highlights
We describe the relationship between refractive errors and biometric components in different types of refractive errors
Among different components of axial length (AL), vitreous chamber depth made the most contribution to changes in refractive errors, while anterior chamber depth (ACD) and lens thickness (LT) showed less variation with refractive errors
A longer AL and its components such as vitreous chamber depth (VCD) and ACD in myopes, and the reverse in hyperopes has been discussed in previous reports as well.[2,4,7,9,13]
Summary
Refractive errors are one of the leading causes of vision impairment around the world and many studies. How to cite this article: Hashemi H, Khabazkhoob M, Emamian MH, Shariati M, Miraftab M, Yekta A, et al Association between refractive errors and ocular biometry in Iranian adults. Refractive Errors and Ocular Biometry; Hashemi et al have addressed their etiology.[1,2,3] In some studies, part of refractive errors has been attributed to ocular biometrics.[2,3,4] Most reports suggest axial length (AL) and vitreous chamber depth (VCD), as the most important components in relation to refractive errors.[5,6]
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