May 2005
Volume 46, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2005
Alcon LADARVision Wavefront–Guided Photorefractive Keratectomy and Laser in situ Keratomileusis: 6 Month Results
Author Affiliations & Notes
  • R. VanRoekel
    Center for Refractive Surgery, Walter Reed Army Medical Center, Washington, DC
  • S.C. Schallhorn
    Department of Ophthalmology, Naval Medical Center, San Diego, CA
  • K. Lombardo
    Department of Ophthalmology, Naval Medical Center, San Diego, CA
  • J.M. Burka
    Center for Refractive Surgery, Walter Reed Army Medical Center, Washington, DC
  • K.S. Bower
    Center for Refractive Surgery, Walter Reed Army Medical Center, Washington, DC
  • R.D. Stutzman
    Center for Refractive Surgery, Walter Reed Army Medical Center, Washington, DC
  • C.P. Kuzmowych
    Center for Refractive Surgery, Walter Reed Army Medical Center, Washington, DC
  • Footnotes
    Commercial Relationships  R. VanRoekel, None; S.C. Schallhorn, None; K. Lombardo, None; J.M. Burka, None; K.S. Bower, None; R.D. Stutzman, None; C.P. Kuzmowych, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2005, Vol.46, 4335. doi:
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      R. VanRoekel, S.C. Schallhorn, K. Lombardo, J.M. Burka, K.S. Bower, R.D. Stutzman, C.P. Kuzmowych; Alcon LADARVision Wavefront–Guided Photorefractive Keratectomy and Laser in situ Keratomileusis: 6 Month Results . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4335.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Abstract:
 

To report the 6–month visual outcomes after wavefront–guided (WFG) photorefractive keratectomy (PRK) and laser in–situ keratomileusis (LASIK) using the Alcon LADARVision excimer laser system. 62 subjects (42 PRK and 20 LASIK) were included in this prospective, multi–center study. All subjects underwent WFG treatment in their dominant eye and conventional treatment in their non–dominant eye. Outcome measures included uncorrected visual acuity (UCVA), best–corrected visual acuity (BCVA), and low contrast acuity (CA) at 6 months postop. High contrast (HC) BCVA, photopic 5% CA (80–140 cd/m2), and mesopic 25% CA (0.8–1.2 cd/m2) were performed with best correction and compared to preoperative measurements. Surgically induced changes were compared for the four procedures: WFG PRK, conventional PRK, WFG LASIK, and conventional LASIK. There was no difference in UCVA or HC BCVA between treatment groups. The 5% CA improved by a mean of 0.02 logMAR following both WFG PRK and WFG LASIK, compared to a mean decrease of 0.03 logMAR for both conventional procedures. The net difference in postop 5% CA between WFG and conventional procedures was 0.05 logMAR (equivalent to half a line). The 25% CA decreased the most following conventional LASIK (mean 0.04 logMAR) and conventional PRK (mean 0.03 logMAR). 25% CA following WFG LASIK decreased on average by only 0.01 logMAR, and improved by 0.02 logMAR following WFG PRK. Although HC visual acuity was equal following all 4 procedures, low contrast acuity was generally better following PRK than LASIK, and better with WFG treated compared to conventional treatments. There was an overall improvement in 5% CA for eyes treated with WFG procedures compared to a slight decrease in performance for those eyes treated with conventional procedures. Of the four procedures, only the WFG PRK improved mesopic 25% CA postoperatively. WFG PRK appears to provide excellent quality vision, particular in low contrast low light environment.

 

 

 
Keywords: refractive surgery: comparative studies • refractive surgery: PRK • contrast sensitivity 
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