摘要
AIM: To study the impact of scleral flap position, under which the posterior chamber intraocular lenses (PC-IOL) were sulcus-fixed by trans-scleral suture, on cornea astigmatism. METHODS: Twenty-six aphakic or cataract eyes were comprised in this prospective noncomparative case series study. Eleven eyes had traumatic cataract removed without sufficient capsular support, 3 had blunt trauma with subluxated traumatic cataract, 8 had undergone vitreoretinal surgery and 4 had congenital cataract removed. The average age was 54 years (range 21-74 years), with 17 men and 7 women. The foldable PC-IOL was fixed in sulcus by trans-scleral suture. The incision for IOL implantation was made 1mm posterior to limbus along the steepest meridian of cornea, while scleral flaps to bury the knots of trans-scleral suture were made along the flattest meridian. All the surgeries were performed by a single doctor (Ma L), and the follow up was at least 13 months (range 13-28 months). The preoperative, 3 months and 1 year postoperative corneal curvature along the steepest and flattest cornea meridian and overall cornea astigmatism were compared. RESULTS: The curvature along the steepest meridian changed from 44.25 +/- 2.22D preoperatively to 44.08 +/- 2.16D at 3 months postoperatively, and 43.65 +/- 5.23D at 1 year postoperatively (P>0.05); the curvature along the flattest meridian changed from 41.24 +/- 2.21D preoperatively to 43.15 +/- 3.94D at 3 months postoperatively, and 42.85 +/- 5.17D at 1 year postoperatively (P<0.05); and the surgery induced astigmatism (SIA) on cornea was calculated by vector analysis, which was 2.42 +/- 2.13D at 3 months postoperatively, and 2.18 +/- 3.42D at 1 year postoperatively, the difference was statistically significant (P<0.05). CONCLUSION: The scleral flap made along the flattest meridian, under which the posterior chamber intraocular lenses (PCIOL) were sulcus-fixed by trans-scleral suture, can steepen the cornea in varying degrees, thus reducing preexisting corneal astigmatism.
AIM: To study the impact of scleral flap position, under which the posterior chamber intraocular lenses (PC-IOL) were sulcus-fixed by trans-scleral suture, on cornea astigmatism. METHODS: Twenty-six aphakic or cataract eyes were comprised in this prospective noncomparative case series study. Eleven eyes had traumatic cataract removed without sufficient capsular support, 3 had blunt trauma with subluxated traumatic cataract, 8 had undergone vitreoretinal surgery and 4 had congenital cataract removed. The average age was 54 years (range 21-74 years), with 17 men and 7 women. The foldable PC-IOL was fixed in sulcus by trans-scleral suture. The incision for IOL implantation was made 1mm posterior to limbus along the steepest meridian of cornea, while scleral flaps to bury the knots of trans-scleral suture were made along the flattest meridian. All the surgeries were performed by a single doctor (Ma L), and the follow up was at least 13 months (range 13-28 months). The preoperative, 3 months and 1 year postoperative corneal curvature along the steepest and flattest cornea meridian and overall cornea astigmatism were compared. RESULTS: The curvature along the steepest meridian changed from 44.25 +/- 2.22D preoperatively to 44.08 +/- 2.16D at 3 months postoperatively, and 43.65 +/- 5.23D at 1 year postoperatively (P>0.05); the curvature along the flattest meridian changed from 41.24 +/- 2.21D preoperatively to 43.15 +/- 3.94D at 3 months postoperatively, and 42.85 +/- 5.17D at 1 year postoperatively (P<0.05); and the surgery induced astigmatism (SIA) on cornea was calculated by vector analysis, which was 2.42 +/- 2.13D at 3 months postoperatively, and 2.18 +/- 3.42D at 1 year postoperatively, the difference was statistically significant (P<0.05). CONCLUSION: The scleral flap made along the flattest meridian, under which the posterior chamber intraocular lenses (PCIOL) were sulcus-fixed by trans-scleral suture, can steepen the cornea in varying degrees, thus reducing preexisting corneal astigmatism.
基金
Government Foundation of Liaoning Province, Shenyang,China(No.20081059,2008860)
