Effect of corneal suture tensions on the accuracy of intraocular lens power calculation in traumatic cataract / 国际眼科杂志(Guoji Yanke Zazhi)

@#AIM: To explore the effect of corneal suture tension on the accuracy of intraocular lens power calculation in traumatic cataract.<p>METHODS: In this prospective study, 57 patients who were waiting for secondary intraocular lens implantation surgery with sutured corneal penetrating injury and extracted traumatic cataract in our hospital from March 2017 to March 2019, were divided into observation group and control group. Corneal sutures were removed one week before operation in the observation group, while corneal sutures were removed during the operation in the control group. The corneal curvature, corneal astigmatism, anterior chamber depth, axial length and theoretical intraocular lens power in the observation group were compared before and after suture removal; the postoperative uncorrected visual acuity and corneal astigmatism were compared between the observation group and the control group.<p>RESULTS: There were significant changes in corneal curvature(43.15±1.32D <i>vs</i> 45.05±1.20D), corneal astigmatism(-5.23±2.52D <i>vs</i> -2.04±1.44D)and theoretical intraocular lens power(22.24±2.36D <i>vs</i> 20.40±1.46D)before and after suture removal(<i>P</i><0.05), while there were no difference in anterior chamber depth and axis length in the observation group(<i>P</i>Symbol～@@0.05). The uncorrected visual acuity was better, and the corneal astigmatism was lower 1d, 1wk, 1mo and 3mo post-operative in the observation group than that in the control group(<i>P</i><0.05).<p>CONCLUSION: Corneal suture tension has significant effect on corneal astigmatism, theoretical intraocular lens power calculation and postoperative refraction in traumatic cataract patients.

Short-term Effect of Suture Tension after Scleral Tunnel Incision in Posterior Chamber Lens Implantation on Preexisting Astigmatism

In this two-month prospective study, reduction of preexisting astigmatism in 35 eyes was attempted by tension control of a mattress. In the first group, which had WTR astigmatism over 1.5 diopter(D) the wound was closed with loose mattress suture(MS). This reduced WTR astigmatism 1.52 D at 2 months. In the second group(WTR astigmatism, under 1.5 D)closed with a adaptation suture, the preexisting WTR astigmatism did not show a significant shift toward ATR astigmatism. In the third group closed with a tight MS, the preexisting ATR astigmatism was not significantly increased.

Suture Tension Adjustment of Single Running Suture in Penetrating Keratoplasty

We performed suture tension adjustment (STA) in 8 patients who had undergone penetrating keratoplasty with 10-0 nylon running suture closure. 3 to 8 weeks after the surgery, STA was done by loosening the suture tension at the steep meridian and tightening at the flat meridian, guided by automatic keratometery, keratoscopic finding and manifest refraction. Pre-STA astigmatism of 6.27 +/- 1.84 diopter(D) was changed to 1.94 +/- 1.40D immediately after the adjustment. Post-STA astigmatism regressed mostly within two weeks of adjustment, remaining stable thereafter: In one case, suture breakage occurred during adjustment, and resuturing was done using a new 10-0 nylon tied to the broken ends without serious sequela.