Comparative study of corneal topographic changes after 3.0 mm beveled and hinged clear corneal incisions

J Cataract Refract Surg. 1998 Nov;24(11):1498-504. doi: 10.1016/s0886-3350(98)80173-9.


Purpose: To compare the corneal topographic changes after cataract surgery using 2 types of clear corneal incisions (CCIs).

Setting: Department of Ophthalmology, University of Vienna, Austria.

Methods: This prospective, unmasked, nonrandomized study comprised 64 eyes scheduled for cataract surgery; 29 eyes received a temporal sutureless 3.0 mm corneal beveled CCI and 35 eyes, a temporal sutureless 3.0 mm hinged CCI. Preoperatively and 1 week, 1 and 3 months, and 1 year postoperatively, corneal topography was recorded by computer-assisted videokeratoscopy (TMS-1, Computed Anatomy, Inc.). Data were evaluated by batch-by-batch analyses of the paired differences between these records. The significance of topographic changes was calculated by paired Wilcoxon tests, and group comparisons were made using Wilcoxon tests.

Results: In both groups, there was statistically significant horizontal flattening and lower corneal steepening (P < .01). The horizontal flattening decreased between 1 week and 1 year, from -0.6 to -0.3 diopter (D) in the beveled-incision group and -0.7 to -0.4 D in the hinged-incision group. Vertical steepening was significant in the lower corneal region and decreased between 1 week and 1 year, from 0.3 to 0.2 D. Group comparisons revealed significant differences in an oblique lower temporal semimeridian, with 0.1 to 0.3 D more steepening after the hinged incision than after the beveled incision (P < .05).

Conclusion: There were only minimal differences between beveled and hinged CCIs in surgically induced corneal shape changes.

Publication types

  • Comparative Study

MeSH terms

  • Cornea / pathology*
  • Cornea / surgery*
  • Corneal Topography*
  • Humans
  • Lens Implantation, Intraocular
  • Lenses, Intraocular
  • Phacoemulsification / methods*
  • Prospective Studies
  • Silicone Elastomers


  • Silicone Elastomers