Comparison of Autorefractometry and Aberrometry with subjective refraction in myopic refractive errors
Journal Title: Medpulse International Journal of Ophthalmology - Year 2017, Vol 4, Issue 2
Abstract
Background: For the assessment of refractive errors, various methods are available. Usually an objective method like retinoscopy or autorefractometry is carried out first, which is further refined by subjective acceptance’ before prescribing the spectacles. Though retinoscopy is considered the gold standard, autorefractometry is commonly used as a good starting point of objective refraction as it is easier and less time-consuming. Aberrometry refers to analysis of optical aberrations, both lower order aberrations and higher order aberrations, widely used in refractive surgical practice, and is considered an accurate objective method of assessing the eye’s refractive status. Purpose: The objective of this study was to compare the refractive assessment by autorefractometer, aberrometer and subjective refraction in myopic and myopic astigmatic refractive errors and to find any possible correlation between higher order aberrations and degree of refractive error in Indian eyes. Materials and Methods: 300 eyes of one hundred and fifty healthy individuals aged between 10 and 38 years were recruited during examination. Refractive corrections were converted to sphero-cylindrical correction for the ease of calculation. Data were statistically evaluated using ANOVA. Results: Mean value of refractive assessment among subjective refraction was -2.79 ± 2.18D (Diopters), in autorefractometer it was -3.44 ± 2.49D and in aberrometry it was -3.49±2.32D. There was statistically no significant difference between autorefractometry and aberrometry (p = 0.766). Comparing the refractive corrections, both autorefractometry and aberrometry results were significantly different from subjective refraction (p< 0.001).Also, there was statistically significant negative correlation between Z (4,0) and AR, (Pearson coefficient -0.172), Z(4,0) and SR (Pearson coefficient -0.131), and Z(4,0) and ABR (Pearson coefficient - 0.189). Conclusion: In our study, there was no significant difference between the aberrometer and autorefractor derived measures of refractive errors. The Hartmann – Shack aberrometerwas found to have a range of accuracy similar to that of autorefraction. However, there existed statistically significant differences between autorefractometer and aberrometer values with subjective refraction. Hence, while prescribing spectacles, the data obtained from either of these instruments would alone not be sufficient and can only be used as a starting point for subjective refraction. Also, higher order aberrations decreased with increase in myopia
Authors and Affiliations
Anil Radhakrishnan, Linu K Lalu
Keywords
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