Surgically induced astigmatism following a 4.0 mm sclerocorneal valve incision

J Cataract Refract Surg. 1997 Apr;23(3):358-64. doi: 10.1016/s0886-3350(97)80180-0.


Purpose: To determine whether sutureless small incision cataract surgery reduces induced astigmatism over the long term.

Setting: University Eye Hospital, Vienna, Austria.

Methods: In a prospective study, we investigated surgically induced astigmatism in 63 cases of no-stitch, small incision cataract surgery with a 4.0 mm square sclerocorneal tunnel and implantation of a flexible intraocular lens. Follow-up was 4 to 5 years. Keratometry was measured with a Zeiss keratometer preoperatively and after 1 day, 1 week, 1, 3, and 9 months, and a median of 4.4 years. In 21 nonoperated eyes, we investigated the natural course of astigmatism over 5 years.

Results: The mean keratometric cylinder stabilized at 0.8 diopter (D) after 1 week and slightly decreased to 1.0 D after 4 to 5 years. Cravy's vector analysis showed an immediate against-the-rule (ATR) shift of -0.2 D that remained relatively stable until 9 months. Between 9 months and 4.4 years postoperatively, there was a statistically significant increase in ATR induced astigmatism from -0.2 to -0.5 D. The natural course of astigmatism in the nonoperated eyes showed an ATR shift of -0.1 D for the same period.

Conclusion: The result show a small, though statistically significant amount of postoperatively induced astigmatism 4 to 5 years after no-stitch, small incision cataract surgery.

MeSH terms

  • Aged
  • Astigmatism / etiology*
  • Astigmatism / pathology
  • Cataract Extraction / adverse effects*
  • Cataract Extraction / methods
  • Cornea / pathology
  • Cornea / surgery*
  • Follow-Up Studies
  • Humans
  • Postoperative Complications*
  • Prospective Studies
  • Sclera / surgery*
  • Suture Techniques*
  • Time Factors
  • Visual Acuity