Values in diopters top panels and bottom-left panel are indicated at the bottom of each graphs, while the CI graphs shows the index values bottom-right panel. When the target is emmetropia, the TIA magnitude is essentially equal to the pre-operative magnitude. Vectorial astigmatic changes after corneal collagen crosslinking in keratoconic corneas previously treated with intracorneal ring segments: The set of six figures was recently expanded to nine graphs in order to include additional information regarding astigmatism outcomes [ 1 ], and a similar set of standards was recently added to cover lens-based refractive surgery [ 2 ]. J Cataract Refract Surg. AstigMATIC can be used to automatically produce the standard graphs for reporting outcomes for astigmatism correction, based on the Alpins Method, that are recommended by refractive surgery and ophthalmology journals [ 10 , 12 — 15 ].
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Significance of the AstigMATIC software Astigmatism analyses are multi-dimensional downloae subtle nuances cannot be fully captured in a single graphical display [ 1012 — 15 ].
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Vector analysis of astigmatism correction after toric intraocular lens implantation. Open in a separate window. While these newer figures cover the main outcome measures for refractive surgery, in studies where astigmatism doownload is a contributing feature, supplementary downloadd astigmatism analyses should be conducted [ 12 ]. The Alpins Method graphs include the following:. Standardized graphs and terms for refractive surgery results. AstigMATIC can be used providing that the user s cite the current manuscript when including results generated from AstigMATIC in any publication, presentation, or other public communication, whether peer-reviewed or non-peer-reviewed.
The TIA and SIA vectors are then calculated by converting the pre-operative and post-operative astigmatism values from polar coordinates to rectangular coordinates using basic trigonometry, as extensively described elsewhere [ 10 — 14 ]. Each individual vectorial point is plotted as a black line ending by a blue circle marker. Standard for reporting refractive outcomes of intraocular Lens-based refractive surgery.
A new method of analyzing vectors for changes in astigmatism. AstigMATIC is currently limited to astigmatism vector analyses and will not analyze other refractive errors, such as sphere or spherical equivalent. Both authors approved the final manuscript.
Astigmatism vector analysis, Target-induced astigmatism vector, Surgically-induced astigmatism vector, Difference vector, Correction index, Alpins Method. These vectors are then used to generate the four standard graphs, where the vector means are plotted as a red diamond, and where the arithmetic means and standard deviations for the X and Y directions are displayed in the call-out boxes, as previously proposed [ 1 ].
Of note, there are a limited number of papers that use the American National Standards Institute ANSI nomenclature [ 26 ], but the use of this nomenclature is incorrect and its use should be avoided [ 10 ]. Future versions might eventually include the automated generation of tables.
AstigMATIC: an automatic tool for standard astigmatism vector analysis
Based on these well-established metrics [ 1012 — 15 ], AstigMATIC provides the automated production of these four recommended single-angle polar graphs. Usage AstigMATIC can be used to automatically produce the standard graphs for reporting outcomes for astigmatism correction, based on the Alpins Method, that are recommended by refractive surgery and ophthalmology journals [ 1012 — 15 ]. We elected to fix the format and color of the AstigMATIC graphs so that they would be in accordance with current journal standards [ 111 ].
Background Introduction Standardization for reporting medical outcomes facilitates clinical study comparisons and has a fundamental role on reproducibility [ 12 ].
Examples of the four vector graphs that are generated by AstigMATIC from the pre- and post-operative cylinder magnitude and axis in within-the-rule WTR astigmatism eyes aagainst-the-rule ATR astigmatism eyes band oblique astigmatism eyes c. The data must be provided in xstig point decimal format e.
The Alpins Method provides a simple approach whereby four graphs are used to answer distinct questions, enabling the cause of an inaccurate astigmatic correction to be understood and the effectiveness of an astigmatic treatment to be evaluated [ 1012 — 15 ].
Astigmatism analysis by the Alpins method. Standardized analyses of correction of astigmatism by laser systems that reshape the cornea. The four stigmatism vectors are calculated according to the Alpins Method which was previously, and extensively, described elsewhere [ 1012 — 15 ].
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There are five columns. This file format was selected due to its widespread use and simplicity. Upon starting the application, raw astigmatism data must first be imported Fig. The Alpins Method graphs include the following: Author information Article notes Copyright and License information Disclaimer. downooad
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The set of six figures was recently expanded to nine downloar in order to include additional information regarding astigmatism outcomes [ 1 ], and a similar set of standards was recently added to cover lens-based refractive surgery [ 2 ]. In refractive surgery RSthe first set of standards for outcomes reporting was originally proposed by Waring in [ 3 ] and later implemented as a set of six standard figures summarizing the accuracy, efficacy, safety, and stability of a surgical procedure [ 4 — 10 ].
A total of 3 simulated, realistic, datasets were produced by an experienced ophthalmic surgeon A.