Evaluation of patient visual comfort and repeatability of refractive values in non-presbyopic healthy eyes
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1Department of Surgery, Gynaecology and Obstetrics, University of Zaragoza, Zaragoza 50009, Spain;
2Aragon Health Sciences Institute, University of Zaragoza, Zaragoza 50009, Spain;
3Department of Applied Physics, University of Zaragoza, Zaragoza 50009, Spain;
4Department of Physiology and Pharmacology, University of Zaragoza, Zaragoza 50009, Spain;
5Department of Ophthalmology, Lozano Blesa University Hospital, Zaragoza 50009, Spain

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Supported by the Government of Aragon, Group B99; Fund of Health Research from Institute of Health Carlos III (Spanish Ministry of Health) PS0901854 and PI13/01124; University of Zaragoza grant FPUZ-2011-BIO-02.

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    Abstract:

    AIM: To evaluate the intra-operator repeatability in healthy subjects using the WAM-5500 auto-kerato/refractometer and the iTrace aberrometer, to compare the refractive values and the subjective refraction obtained with both devices and to determine which of these three spherocylindrical corrections allows the subject to achieve the best visual comfort. METHODS: Forty-two non-presbyopic healthy eyes of 42 subjects were enrolled in this prospective study. Refractive values were compared, evaluating the repeatability, the relationship between the methods and the best visual comfort obtained. RESULTS: Sphere, cylinder and axis results showed good intraclass correlation coefficients (ICC); the highest ICC was obtained using the spherical refraction with the autorefractometer and the aberrometer, achieving levels of 0.999 and 0.998, respectively. The power vector (PV) was calculated for each refraction method, and the results indicated that there were no statistically significant differences between them (P>0.05). Direct comparison of PV measurements using the three methods showed that aberrometer refraction gave the highest values, followed by the subjective values; the autorefractometer gave the lowest values. The subjective method correction was most frequently chosen as the first selection. Equal values were found for the autorefractometer and the aberrometer as the second selection. CONCLUSION: The iTrace aberrometer and the WAM-5500 auto-kerato/refractometer showed high levels of repeatability in healthy eyes. Refractive corrections with the aberrometer, the autorefractometer and subjective methods presented similar results, but spherocylindrical subjective correction was the most frequently selected option. These technologies can be used as complements in refractive evaluation, but they should not replace subjective refraction.

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Francisco Segura, Ana Sanchez-Cano, Carmen Lopez de la Fuente, et al. Evaluation of patient visual comfort and repeatability of refractive values in non-presbyopic healthy eyes. Int J Ophthalmol, 2015,8(5):1031-1036

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Publication History
  • Received:May 20,2014
  • Revised:February 15,2015
  • Adopted:February 15,2015
  • Online: October 09,2015
  • Published: