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    Changes in the ABCD Keratoconus Grade After Intracorneal Ring Segment Implantation

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    Author
    Sedaghat, Mohammad-Reza
    Momeni-Moghaddam, Hamed
    Belin, Michael W
    Zarei-Ghanavati, Siamak
    Akbarzadeh, Reyhaneh
    Sabzi, Fatemeh
    Yekta, Abbas-Ali
    Sadeghi Allahabadi, Javad
    Affiliation
    Univ Arizona, Dept Ophthalmol & Vis Sci
    Issue Date
    2018-11-01
    Keywords
    keratoconus
    staging
    intracorneal ring segments
    Keraring
    corneal tomography
    
    Metadata
    Show full item record
    Publisher
    LIPPINCOTT WILLIAMS & WILKINS
    Citation
    Sedaghat, M. R., Momeni-Moghaddam, H., Belin, M. W., Zarei-Ghanavati, S., Akbarzadeh, R., Sabzi, F., ... & Allahabadi, J. S. (2018). Changes in the ABCD Keratoconus Grade After Intracorneal Ring Segment Implantation. Cornea, 37(11), 1431-1437.
    Journal
    CORNEA
    Rights
    Copyright © 2018 Wolters Kluwer Health, Inc. Unauthorized reproduction of this article is prohibited.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    To assess the changes in the ABCD keratoconus staging system 6 months after intracorneal ring segment implantation. Fifty eyes of 50 patients with keratoconus who were implanted with the Keraring (Mediphacos, Belo Horizonte, Brazil) using the femtosecond laser were assessed. Preoperative and postoperative assessments included determination of distance uncorrected visual acuity and distance corrected visual acuity (DCVA), refraction, and Scheimpflug tomography with the Pentacam HR. In the ABCD keratoconus staging system, the elements A, B, C, and D stand for anterior and posterior radii of curvature in a 3.0-mm zone centered on the thinnest point (TP), corneal thickness at the TP, and DCVA, respectively. Keraring implantation produced significant flattening changes (preoperatively vs. postoperatively) in the anterior (6.60 ± 0.48 vs. 7.22 ± 0.57 mm, P < 0.001) and posterior (4.99 ± 0.47 vs. 5.16 ± 0.53 mm, P = 0.002) radii of curvature of the 3-mm zone centered on the corneal TP associated with a statistically significant improvement in the DCVA (0.56 ± 0.24 vs. 0.70 ± 0.22 in the decimal notation, P = 0.001) with no significant change in the corneal thickness at the TP (P = 0.285). The most changes occurred in element A of the ABCD keratoconus classification. Also, a 1-stage change was observed for element B, whereas elements C and D did not show changes in their postoperative stages after ring implantation. ABCD keratoconus staging before ring implantation was A2B3C2D1 and changed to A1B2C2D1 6 months after surgery. The ABCD staging system provides a more comprehensive guide that better illustrates the structural changes and visual acuity as one aspect of visual function after the implantation of the intrastromal corneal ring segments.
    Note
    12 month embargo; published online ahead of print May 31, 2018.
    ISSN
    1536-4798
    PubMed ID
    29863546
    DOI
    10.1097/ICO.0000000000001648
    Version
    Final accepted manuscript
    ae974a485f413a2113503eed53cd6c53
    10.1097/ICO.0000000000001648
    Scopus Count
    Collections
    UA Faculty Publications

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