May 2004
Volume 45, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2004
Corneal topography and wavefront analysis in CRT patients.
Author Affiliations & Notes
  • N.V. Potapova
    Ophthalmology, Mt. Sinai Hospital,, New York, NY
  • G. Wang
    Ophthalmology, Mt. Sinai Hospital,, New York, NY
  • S. Haji
    Ophthalmology, Mt. Sinai Hospital,, New York, NY
  • A. Balashanmugam
    Ophthalmology, Mt. Sinai Hospital,, New York, NY
  • P. Asbell
    Ophthalmology, Mt. Sinai Hospital,, New York, NY
  • H. Hussein
    Ophthalmology, Mt. Sinai Hospital,, New York, NY
  • Footnotes
    Commercial Relationships  N.V. Potapova, Marco F; G. Wang, Marco F; S. Haji, Marco F; A. Balashanmugam, Marco F; P. Asbell, Marco F; H. Hussein, Marco F.
  • Footnotes
    Support  NEI #5P30EYO1867, RPB(to P.Asbell,MD and Department) and Marco
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 2857. doi:
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    • Get Citation

      N.V. Potapova, G. Wang, S. Haji, A. Balashanmugam, P. Asbell, H. Hussein; Corneal topography and wavefront analysis in CRT patients. . Invest. Ophthalmol. Vis. Sci. 2004;45(13):2857.

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

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Abstract

Abstract: : Purpose: To evaluate the visual outcome, corneal topography changes and wavefront analysis in normal myops after CRT, corneal reshaping contact lenses worn only at night to provide good uncorrected visual acuity (UCVA) during the day. Methods: Thirty nine eyes were fitted with Paragon CRT contact lenses which were worn nightly. Before and after CRT fitting, uncorrected visual acuity was measured, corneal topography with Holladay Diagnostic Summary, EyeSys 2000 Videokeratoscope and wavefront analysis with Marco 3DWave were performed. To evaluate the visual outcome, refractive yield (achieved/attempted correction) was calculated, accounting for distance or monovision. Pre–fitting the mean spherical equivalent (SE) was –2.7D±1.03D (n=39 eyes). Results: UCVA improved in all patients. Before the CRT fit 70% of patients had UCVA of 20/200 or worse . One month after the fit the mean refractive yield was 96.76%. At 1 month, mean Q value increased from –0.08 to 0.38 (p=0.0004), PCA and CUI showed no significant changes. Topographic mean regular astigmatism decreased from 0.846 before fit to 0.762 (p=0.32) at 1 month after the fit, and so did irregular astigmatism (from 0.025 to 0.023, p=0.85). Wavefront analysis showed increased in RMS (root mean square) for HOA (higher order aberrations) up to sixth order from mean RMS of 0.151 before the fit to 0.26 at 1 month after the fit. However, during the follow–up period all the RMS values were within normal limits (less that 0.50). Mean for the vertical coma changed from –0.0077 before the fit to 0.0739 at 1 month after the fit, mean for horizontal coma changed from 0.06 to 0.045, mean for vertical trefoil changed from –0.054 to 0.038 and mean for horizontal trefoil changed from 0.092 to 0.136. Conclusion: CRT lenses are affective in improving uncorrected visual acuity. CRT appears to significantly change cornea from prolate to oblate while corneal quality is maintained. CRT increases the amount of higher order aberrations, but the RMS number stays within normal limits. Comparison with myopic LASIK will be presented.

Keywords: contact lens • refractive surgery: corneal topography • refractive surgery: optical quality 
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