Tissue addition theory of radial keratotomy: A geometric model

M. R. Sawusch, W. L. Wan, Peter J McDonnell

Research output: Contribution to journalArticle

Abstract

We examined the use of a geometric model to explain the effects of radial keratotomy (RK) on corneal topography based on wound gape of radial incisions. Histopathologic studies of healed human RK incisions revealed incision gape in Bowman's membrane and anterior stroma, with intervening epithelial ingrowth or fibrous scarring. For six human RK incisions examined centrally, mid-peripherally, and peripherally, the linear separation of the cut ends of Bowman's membrane averaged 0.012 mm, 0.018 mm, and 0.027 mm, respectively. The effect on postoperative corneal flattening of the ''addition of tissue'' within incisions was mathematically predicted by calculating the effects of inducing radial gape on a spherical shell. The predicted change in corneal curvature agreed closely with data from a human case report. The ''tissue addition'' theory may partly explain the change in corneal topography following RK and subsequent wound healing.

Original languageEnglish (US)
Pages (from-to)448-453
Number of pages6
JournalJournal of Cataract and Refractive Surgery
Volume17
Issue number4
StatePublished - 1991
Externally publishedYes

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Radial Keratotomy
Bowman Membrane
Corneal Topography
Wound Healing
Cicatrix
Wounds and Injuries

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Tissue addition theory of radial keratotomy : A geometric model. / Sawusch, M. R.; Wan, W. L.; McDonnell, Peter J.

In: Journal of Cataract and Refractive Surgery, Vol. 17, No. 4, 1991, p. 448-453.

Research output: Contribution to journalArticle

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