Long-term course of surgically induced astigmatism after a 5.0 mm sclerocorneal valve incision

J Cataract Refract Surg. 1998 Dec;24(12):1642-6. doi: 10.1016/s0886-3350(98)80357-x.


Purpose: To study surgically induced astigmatism (SIA) after a sutureless 5.0 mm sclerocorneal valve incision.

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

Methods: This study evaluated SIA in 34 cases of sutureless cataract surgery with a 5.0 mm superior sclerocorneal valve incision and implantation of a poly(methyl methacrylate) intraocular lens. Keratometry was measured with a Zeiss keratometer in all cases preoperatively, and 1 day, 1 week, 1 and 3 months, and 1 and 5 years postoperatively.

Results: Surgically induced astigmatism, calculated by Cravy's vector analysis, showed an initial mean with-the-rule shift of 0.35 diopter (D), followed by an against-the-rule shift to a mean of -0.30 D after 1 month. One year postoperatively, mean SIA was -0.46 D. Between 1 and 5 years postoperatively, there was a statistically significant increase in mean SIA calculated by Cravy's vector analysis; SIA increased from -0.46 D after 1 year to -0.76 D after 5 years postoperatively.

Conclusions: A small, although statistically significant, amount of postoperatively induced astigmatism occurred 5 years after a sutureless 5.0 mm sclerocorneal valve incision.

MeSH terms

  • Aged
  • Astigmatism / etiology*
  • Astigmatism / physiopathology
  • Cornea / physiopathology
  • Cornea / surgery*
  • Female
  • Follow-Up Studies
  • Humans
  • Lens Implantation, Intraocular
  • Lenses, Intraocular
  • Male
  • Minimally Invasive Surgical Procedures
  • Phacoemulsification / adverse effects*
  • Phacoemulsification / methods
  • Polymethyl Methacrylate
  • Sclera / physiopathology
  • Sclera / surgery*
  • Surgical Flaps
  • Time Factors
  • Visual Acuity


  • Polymethyl Methacrylate