Jauhari Nidhi, Chopra Deepak, Chaurasia Rajan Kumar, Agarwal Ashutosh
Department of Ophthalmology, Vivekananda Polyclinic and Institute of Medical Sciences, Vivekanandpuri, Lucknow, Uttar Pradesh 226001, India.
Department of Community Medicine, Integral University of Medical Sciences and Research, Kursi Road, Lucknow, Uttar Pradesh 226026, India.
Int J Ophthalmol. 2014 Dec 18;7(6):1001-4. doi: 10.3980/j.issn.2222-3959.2014.06.16. eCollection 2014.
To determine the surgically induced astigmatism (SIA) in Straight, Frown and Inverted V shape (Chevron) incisions in manual small incision cataract surgery (SICS).
A prospective cross sectional study was done on a total of 75 patients aged 40y and above with senile cataract. The patients were randomly divided into three groups (25 each). Each group received a particular type of incision (Straight, Frown or Inverted V shape incisions). Manual SICS with intraocular lens (IOL) implantation was performed. The patients were compared 4wk post operatively for uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA) and SIA. All calculations were performed using the SIA calculator version 2.1, a free software program. The study was analyzed using SPSS version 15.0 statistical analysis software.
The study found that 89.5% of patients in Straight incision group, 94.2% in Frown incision group and 95.7% in Inverted V group attained BCVA post-operatively in the range of 6/6 to 6/18. Mean SIA was minimum (-0.88±0.61D×90 degrees) with Inverted V incision which was statistically significant.
Inverted V (Chevron) incision gives minimal SIA.
确定手法小切口白内障手术（SICS）中直线形、皱眉形和倒V形（人字形）切口所导致的手术性散光（SIA）。
对75例年龄40岁及以上的老年性白内障患者进行前瞻性横断面研究。患者被随机分为三组（每组25例）。每组接受一种特定类型的切口（直线形、皱眉形或倒V形切口）。进行手法小切口白内障手术并植入人工晶状体（IOL）。术后4周对患者的未矫正视力（UCVA）、最佳矫正视力（BCVA）和手术性散光进行比较。所有计算均使用免费软件程序SIA计算器2.1版进行。使用SPSS 15.0统计分析软件对研究进行分析。
研究发现，直线形切口组89.5%的患者、皱眉形切口组94.2%的患者和倒V形切口组95.7%的患者术后最佳矫正视力在6/6至6/18范围内。倒V形切口的平均手术性散光最小（-0.88±0.61D×90度），具有统计学意义。
倒V形（人字形）切口导致的手术性散光最小。
