Standardized Analyses of Correction of Astigmatism by Laser Systems That Reshape the Cornea

Abstract

PURPOSE:To develop a minimum set of analyses and a format for presentation of outcomes of astigmatism correction by laser systems that reshape the cornea.

Vector analysis with the femtosecond laser

“…These issues have been addressed in past correspondence and editorials 8,11-15 generated by Eydelman et al 9 It is unfortunate that potentially good science can be overshadowed by neglecting the fundamentals of accurate sourcing and reporting of data. I am disappointed that during the 6-month review period of the Kunert et al 1 Editors Note: We agree: It is important to recognize and reference Alpins 5 pioneering work in this area and particularly the analytical system that he developed, a modified version of which was described by Eydelman et al For purposes of clarity and consistency with the majority of papers that use this type of analysis, we recommend that authors use Alpins 5 original terms and equations.…”

“…They correctly note that I proposed the use of a coefficient of adjustment (CA), 7 defined as the ratio of the intended to the induced astigmatism. They go on to write that the CA corresponds to the inverse of the correction ratio (CR) as defined by Eydelman et al 9 The CR described by Eydelman et al 9 is, in fact, a minor rewording of my previously described correction index. 6,7 Although the non-peer-reviewed paper by Eydelman et al 9 does not seem to have been widely cited thus far, it concerns me that it may become a de facto standard for astigmatism analysis.…”

Astigmatism analysis: The spectrum of approaches

“…The Borasio paper demonstrates the elegance and usefulness of the Alpins method. It is gratifying to see that several elements of Alpins' approach have been incorporated into the recommendations of the Astigmatism Project Group of the American National Standards Institute, 9 although I believe that Alpins' work was not acknowledged as fully as was warranted. In addition, Eydelman et al 9 changed Alpins' terminology, raising the concern that this will create confusion in the literature.…”

Effect of Iris registration on visual outcome in wavefront-guided LASEK for myopic astigmatism

“…The error of angle (EA) was the angular difference between the achieved treatment and the intended treatment [13].…”

“…Surgical effects on the astigmatism were identified using standardized vector analyses [12][13][14]. Surgically induced astigmatism (SIA, K2 at angle b) was calculated as follows [12]:…”