May 2006
Volume 47, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2006
Effect of Neutral Pressure Conductive Keratoplasty Over Six Months in the Treatment of Hyperopia and Presbyopia
Author Affiliations & Notes
  • P.A. Asbell
    Department of Ophthalmology, Mount Sinai School of Medicine, New York, NY
  • B. Tinio
    Department of Ophthalmology, Mount Sinai School of Medicine, New York, NY
  • M. Ahdoot
    Department of Ophthalmology, Mount Sinai School of Medicine, New York, NY
  • H.R. Milne
    The Eye Center, Columbia, SC
  • S. Pascucci
    Department of Ophthalmology, Florida Eye Health, Fort Myers, FL
  • Footnotes
    Commercial Relationships  P.A. Asbell, None; B. Tinio, None; M. Ahdoot, None; H.R. Milne, None; S. Pascucci, None.
  • Footnotes
    Support  Supported in part by a research grant from NEI#5P30EYO1867, & Research to Prevent Blindness, Inc
Investigative Ophthalmology & Visual Science May 2006, Vol.47, 5864. doi:
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      P.A. Asbell, B. Tinio, M. Ahdoot, H.R. Milne, S. Pascucci; Effect of Neutral Pressure Conductive Keratoplasty Over Six Months in the Treatment of Hyperopia and Presbyopia . Invest. Ophthalmol. Vis. Sci. 2006;47(13):5864.

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

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Abstract

Purpose: : To evaluate the effectiveness of treatment of hyperopia and presbyopia with neutral pressure conductive keratoplasty (NPCK), a modified form of conductive keratoplasty which applies radiofrequency energy to the corneal periphery to produce collagen rearrangement, thereby steepening the central cornea, for the correction of mild to moderate spherical hyperopia.

Methods: : Retrospective review of 20 consecutive eyes that underwent NPCK by one surgeon for the correction of hyperopia and/or presbyopia. The eyes were divided into 3 groups – Group 1 (n = 8): 8 spots in 8.0 mm optical zone (oz) for up to 1 diopter (D) of intended hyperopic correction; Group 2 (n = 7): 8 spots in 7.0 mm oz for up to 1.75 D of intended hyperopic correction; Group 3 (n = 5): 8 spots in 8 mm oz and 8 spots in 7 mm oz for up to 2.50 D of intended hyperopic correction. Average pre– and post treatment auto–keratometry (Auto–K) values were analyzed at 1, 3 and 6 months postop to determine the stability and effectiveness of NPCK and develop a treatment nomogram. Auto–K values were used to have a non–biased end point for data analysis.

Results: : The change of average keratometry values was 0.71 ± 0.59 D (0.00 – 1.57) in Group 1 (8 spots in 8.0 mm oz), 0.91 ± 0.39 D (0.70 – 1.25) in Group 2 (8 spots in 7.0 mm oz), and 1.96 ± 0.33 D (1.62 – 2.50) in Group 3 (8 spots in 8 mm oz and 8 spots in 7.0 mm oz).

Conclusions: : NPCK is an effective form of treatment for the correction of hyperopia and presbyopia. Predictable and effective outcomes were demonstrated in all 3 groups. NPCK offers greater effect with fewer treatment spots as compared to previous FDA studies of conventional conductive keratoplasty. Comparison with results by other surgeons and further follow will be evaluated and presented.

Keywords: refractive surgery • hyperopia • presbyopia 
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