title: A method for assessing the accuracy of surgical technique in the correction of astigmatism.
abstract: Surgical results can be assessed as a function of what was aimed for, what was done, and what was achieved. One of the aims of refractive surgery is to reduce astigmatism; the smaller the postoperative astigmatism the better the result. Determination of what was done--that is, the surgical effect, can be calculated from the preoperative and postoperative astigmatism. A simplified formulation is described which facilitates the calculation (magnitude and direction) of this surgical effect. In addition, an expression for surgical accuracy is described, as a function of what was aimed for and what was achieved.
authors: Unit of Ophthalmology, Royal Liverpool University Hospital.
authors: S B
authors: SB
authors: Kaye
authors: S H
authors: SH
authors: Campbell
authors: K
authors: K
authors: Davey
authors: A
authors: A
authors: Patterson
mesh_terms: D001251:Astigmatism / Q000601:surgery*; D006801:Humans; D008485:Medical Audit; D009885:Ophthalmology / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome