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Investigation of individual A constant in single-piece intraocular lens Toyohiro Tsumura 1 , Hiroyuki Nomoto 2 , Hidetaka Yamaji 3 1Dept of Ophthalmol, Takamatsu Mun Hosp Kagawa Clin 2Nomoto Eye Clin 3Shirai Hosp pp.483-489
Published Date 2014/4/15
DOI https://doi.org/10.11477/mf.1410105184
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Abstract. Purpose:To report we investigated personal A constant in single-piece intraocular lens(IOL)each IOL powers and axial length. Cases and Method:This study was made 252 eyes in 146 patients that received cataract surgery during from Jan. 2011 to Feb. 2013. The IOL we used was NS-60YG(NIDEK). IOL power was calculated using SRK/T formula. A month later after surgery, we measured objective refraction by refractometer ARK-730(NIDEK), and turned out subjective refraction by visual acuity examination. Based on this, we calculated A constant each IOL power and axial length and regard it as individual A constant. Results:Individual A constant of IOL power less than 17 diopter and axial length over 25 mm became smaller than personal A constant. Conclusion:Individual A constant was turned out to be changed each IOL power and axial length. These may be caused by IOL shape and calculated formula itself.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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