title: [Induced astigmatism in cataract surgery. Scleral tunneling incisions of 5.5 mm and 6.5 mm after 1-year follow-up].
abstract: To evaluate the effect of scleral pocket incisions closed with a single horizontal suture on postoperative astigmatism, 97 patients were enrolled in a prospective study. After 1 year of follow-up the data of 80 patients could be analysed. Routine phacoemulsification was performed in all patients consecutively by one surgeon. 40 patients received a posterior chamber lens with a 5 mm by 6 mm oval polymethylmethacrylate (PMMA) optic (group I), and 40 patients received an intraocular lens with a 6 mm diameter round PMMA optic (group II). The incisions were 5.5 mm and 6.5 mm, respectively. Follow-up visits including keratometry were scheduled 1 day, 5 days, 3 months, 6 months and 1 year postoperatively. The induced astigmatism was calculated using vector analysis. One day after operation the mean induced cylinder was 1.22 D in group I and 1.06 D in group II. After 5 days it amounted to 1.09 D (group I) and 1.03 D (group II), and at 3 months it was 1.07 D and 1.00 D, respectively. Six months after operation the induced cylinder was 1.04 D (group I) and 0.96 D (group II), and at 1 year it was 1.02 D and 0.81 D. There was no statistically significant difference between the groups at any time (Wilcoxon test, P > 0.05). We conclude that scleral pocket incisions closed with a single horizontal suture induce about 1 D of corneal astigmatism, with stability over time. There is no clinical advantage in reducing the incision width by using oval optics.
authors.affiliation: Augenklinik Wuppertal.
authors.forename: C
authors.initials: C
authors.lastname: Küllenberg
authors.forename: H
authors.initials: H
authors.lastname: Hermeking
authors.forename: A E
authors.initials: AE
authors.lastname: Willwerth
authors.forename: E
authors.initials: E
authors.lastname: Gerke
mesh_terms: D000368:Aged; D001251:Astigmatism / Q000209:etiology*; D002387:Cataract Extraction; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007910:Lenses, Intraocular; D008297:Male; D008768:Methylmethacrylates; D011183:Postoperative Complications / Q000209:etiology*; D011446:Prospective Studies; D011474:Prosthesis Design; D012029:Refraction, Ocular; D012590:Sclera / Q000601:surgery*
chemical_list: D008768:Methylmethacrylates
vernacular_title: Induzierter Astigmatismus in der Kataraktchirurgie. Skerale Tunnelinzisionen von 5,5 mm und 6,5 mm nach 1jähriger Verlaufskontrolle.