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Effects of combined cataract surgery and trabeculectomy with mitomycin C on ocular dimensions
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  1. S K Law,
  2. A M Mansury,
  3. D Vasudev,
  4. J Caprioli
  1. Jules Stein Eye Institute, University of California, Los Angeles, CA, USA
  1. Correspondence to: Simon K Law MD, 100 Stein Plaza #2-235, Jules Stein Eye Institute, Los Angeles, CA 90095, USA; lawjsei.ucla.edu

Abstract

Aims: To characterise changes in ocular dimensions after combined cataract operation and trabeculectomy with mitomycin C using separate incisions (combined operation).

Methods: 24 consecutive eyes that had combined operation and 16 eyes that had cataract operation alone were enrolled. The axial lengths before and after operations were determined with non-contact optical coherence biometry. The intraocular pressures (IOP), axial lengths, corneal curvatures, and the expected and observed refractive errors before and after operations were compared.

Results: After a combined operation, mean IOP was significantly reduced from 16.6 (SD 5.8) mm Hg to 10.9 (4.1) mm Hg (p<0.00001), and mean axial length was significantly shortened from 24.10 (0.98) mm to 23.98 (0.96) mm (p<0.00001). The mean axial length reduction after combined operation (117 (57) μm) was significantly larger than the reduction after cataract operation alone (75 (38) μm, p<0.02), and correlated significantly with the postoperative IOP (p<0.002). There was a mean with the rule surgically induced corneal astigmatism of 0.44 (0.83) dioptre by vector analysis, and a significant increase of mean keratometry reading of 0.23 (0.46) dioptre after a combined operation. However, there was no significant difference between the expected and observed refractive errors.

Conclusions: Despite an alteration of the axial length and corneal curvature, the refractive outcome after a combined operation did not differ significantly from the predicted refraction.

  • AL, axial length
  • ATR, against the rule
  • IOL, intraocular lens
  • IOP, intraocular pressure
  • WTR, with the rule
  • trabeculectomy
  • glaucoma
  • cataract
  • mitomycin C
  • axial length
  • AL, axial length
  • ATR, against the rule
  • IOL, intraocular lens
  • IOP, intraocular pressure
  • WTR, with the rule
  • trabeculectomy
  • glaucoma
  • cataract
  • mitomycin C
  • axial length

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Footnotes

  • Competing interests: none declared

  • Ethical approval: This study was approved by the institutional board of the University of California, Los Angeles.

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