Refractive change and stability after Descemet membrane endothelial keratoplasty. Effect of corneal dehydration-induced hyperopic shift on intraocular lens power calculation

J Cataract Refract Surg. 2011 Aug;37(8):1455-64. doi: 10.1016/j.jcrs.2011.02.033.

Abstract

Purpose: To determine the refractive change and stability of the transplanted cornea after Descemet membrane endothelial keratoplasty (DMEK) through a 3.0 mm clear corneal incision.

Setting: Tertiary referral center.

Design: Cohort study.

Methods: Subjective and objective refractive data from pseudophakic eyes were obtained before and 3 and 6 months after DMEK.

Results: The study comprised 50 eyes, 7 were phakic and 43 pseudophakic. Six months postoperatively, the corrected distance visual acuity was 20/25 (0.8) or better in 38 eyes (74%). The mean increase in spherical equivalent at 6 months (N = 50) was +0.32 diopter (D) ± 1.01 D (SD) (P=.0304) and in refractive cylinder, -0.48 ± 1.02 D (P=.001). Although Scheimpflug imaging showed a stable anterior corneal curvature, the posterior curvature increased from 5.50 ± 0.5 D preoperatively to 6.40 ± 0.4 D at 6 months and pachymetry decreased from 672 ± 82 μm to 540 ± 59 μm, respectively (both N = 32) (both P=.000).

Conclusions: After DMEK, a slight preoperative to postoperative refractive change and stabilization at 3 months occurred that may induce a hyperopic shift that was not the result of the negative lenticule effect of DSEK/DSAEK. Thus, in DMEK, the hyperopic shift may result from a reversal of a preceding myopic shift induced by stromal swelling in endothelial disease. If so, normal intraocular power nomograms apply for cataract surgery before or during DMEK.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Cohort Studies
  • Cornea / physiopathology*
  • Corneal Topography
  • Descemet Stripping Endothelial Keratoplasty*
  • Desiccation*
  • Female
  • Humans
  • Hyperopia / etiology
  • Hyperopia / physiopathology*
  • Lens Implantation, Intraocular
  • Lenses, Intraocular*
  • Male
  • Middle Aged
  • Nomograms
  • Optics and Photonics
  • Phacoemulsification
  • Postoperative Complications
  • Prospective Studies
  • Pseudophakia / etiology
  • Pseudophakia / physiopathology
  • Refraction, Ocular / physiology*
  • Visual Acuity / physiology