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    Enhanced corneal smoothness may result in shorter recovery time of visual acuity

    Technology also yields higher levels of postoperative visual quality, shorter re-epithelialization time


    Retrospective study

    A total of 1,159 eyes were treated underwent TransPRK. This procedure was chosen for evaluation because of the increased roughness of the corneal surface compared with other surface procedures. The retrospective chart review made among the eight centers on healthy eyes and initial treatments revealed preoperative manifest refractions ranging from –12.25 to +3.25 D, with astigmatism up to 8 D.

    Sixty-six percent (765 eyes) of eyes were evaluated immediately after surgery (day 0), 60% (695 eyes) on day 1 postoperatively, 59% (679 eyes) on week 1, 41% (471 eyes) on week 2, and 46% (538 eyes) on month 1.

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    Investigators reported that the mean visual acuity was 20/40 immediately after surgery, continued to improve over the first postoperative days, and stabilized 2 weeks postoperatively. By 1 week postoperatively, the uncorrected distance visual acuity (UDVA) reached 20/27 (range among centers, 20/25-20/36).

    “These results confirm excellent visual performance in the early postoperative stage compared with the reported visual recovery after surface treatments,” Dr. Lin said. “We are at the front edge of a paradigm shift in refractive surgery. Most patients comment that shortly after surgery, they are seeing almost as well as previously with their glasses. SPT has brought the ‘wow’ effect to transPRK.”

    By month 1 postoperatively, UDVA was comparable to preoperative corrected distance visual acuity (CDVA).

    Importantly, SPT exhibited a high safety profile. At the 1-month evaluation 75% of eyes had not lost any lines of Snellen CDVA; and 27% of eyes had gained one or more lines of Snellen CDVA, according to Dr. Lin.

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    In addition to the safety profile, the predictability of the target refraction was also very good. At the 1-month time point, the mean spherical equivalent was +0.13 ± 0.42 D. The great majority of eyes (81%) were within ±0.5 D of the target refraction.

    The study investigators concluded: “SPT provides excellent results, particularly in the early postoperative stage after surgery. The contributing surgeons reported shorter recovery time of visual acuity, higher levels of postoperative visual quality, and shorter re-epithelialization time using SPT. Most patients commented that immediately after surgery they were seeing almost as well as previously with their glasses.”

    The early outcomes are especially noteworthy because they were obtained with transPRK, a surface treatment, which is characterized by longer visual recovery compared with LASIK in the early postoperative stage, according to investigators.


    David T.C. Lin, MD, FRCSC

    Lin email: [email protected]

    Dr. Lin is a consultant for Schwind. The company released SPT in April 2015.

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