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• W3134295114 abstract "Abstract Background To determine the preoperative factors influencing refractive astigmatism after cataract surgery for astigmatism correction by toric intraocular lens (IOL) implantation and to evaluate the prediction model using these factors. Methods Prospective, observational case series. The right eyes of forty consecutive patients with preoperative corneal astigmatism of the total cornea of 1.5 diopters (D) or more in magnitude and scheduled for implantation of a non-toric IOL during cataract surgery with a 2.4-mm temporal clear corneal incision were examined prospectively. The vertical/horizontal astigmatism component (J0) and oblique astigmatism component (J45) of refractive and corneal astigmatism were converted using power vector analysis. Multivariate regression analysis was performed with refractive astigmatism at three months postoperatively as the dependent variable, and preoperative parameters including age, sex, refractive astigmatism, corneal astigmatism, sphere, spherical equivalent, intraocular pressure, corneal thickness, anterior chamber depth, lens thickness, lens positions (tilt and decentration), axial length, and corneal higher order aberrations as independent variables. The root mean square (RMS) errors were calculated to express the regression model fit. Results The regression model for the J0 component was $$ Postoperativekern0.34em refractivekern0.2em J0=1.05times Conealkern0.2em J0-0.14 $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>P</mml:mi> <mml:mi>o</mml:mi> <mml:mi>s</mml:mi> <mml:mi>t</mml:mi> <mml:mi>o</mml:mi> <mml:mi>p</mml:mi> <mml:mi>e</mml:mi> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>t</mml:mi> <mml:mi>i</mml:mi> <mml:mi>v</mml:mi> <mml:mi>e</mml:mi> <mml:mspace /> <mml:mi>r</mml:mi> <mml:mi>e</mml:mi> <mml:mi>f</mml:mi> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>c</mml:mi> <mml:mi>t</mml:mi> <mml:mi>i</mml:mi> <mml:mi>v</mml:mi> <mml:mi>e</mml:mi> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mn>0</mml:mn> <mml:mo>=</mml:mo> <mml:mn>1.05</mml:mn> <mml:mo>×</mml:mo> <mml:mi>C</mml:mi> <mml:mi>o</mml:mi> <mml:mi>n</mml:mi> <mml:mi>e</mml:mi> <mml:mi>a</mml:mi> <mml:mi>l</mml:mi> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mn>0</mml:mn> <mml:mo>−</mml:mo> <mml:mn>0.14</mml:mn> </mml:math> ( R 2 = 0.96, P < 0.001). The model for the J45 component was $$ Postoperativekern0.34em refractivekern0.2em J45=0.68times Conealkern0.2em J45+0.19times Preoperativekern0.34em refractivekern0.2em J45-0.06 $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>P</mml:mi> <mml:mi>o</mml:mi> <mml:mi>s</mml:mi> <mml:mi>t</mml:mi> <mml:mi>o</mml:mi> <mml:mi>p</mml:mi> <mml:mi>e</mml:mi> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>t</mml:mi> <mml:mi>i</mml:mi> <mml:mi>v</mml:mi> <mml:mi>e</mml:mi> <mml:mspace /> <mml:mi>r</mml:mi> <mml:mi>e</mml:mi> <mml:mi>f</mml:mi> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>c</mml:mi> <mml:mi>t</mml:mi> <mml:mi>i</mml:mi> <mml:mi>v</mml:mi> <mml:mi>e</mml:mi> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mn>45</mml:mn> <mml:mo>=</mml:mo> <mml:mn>0.68</mml:mn> <mml:mo>×</mml:mo> <mml:mi>C</mml:mi> <mml:mi>o</mml:mi> <mml:mi>n</mml:mi> <mml:mi>e</mml:mi> <mml:mi>a</mml:mi> <mml:mi>l</mml:mi> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mn>45</mml:mn> <mml:mo>+</mml:mo> <mml:mn>0.19</mml:mn> <mml:mo>×</mml:mo> <mml:mi>P</mml:mi> <mml:mi>r</mml:mi> <mml:mi>e</mml:mi> <mml:mi>o</mml:mi> <mml:mi>p</mml:mi> <mml:mi>e</mml:mi> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>t</mml:mi> <mml:mi>i</mml:mi> <mml:mi>v</mml:mi> <mml:mi>e</mml:mi> <mml:mspace /> <mml:mi>r</mml:mi> <mml:mi>e</mml:mi> <mml:mi>f</mml:mi> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>c</mml:mi> <mml:mi>t</mml:mi> <mml:mi>i</mml:mi> <mml:mi>v</mml:mi> <mml:mi>e</mml:mi> <mml:mspace /> <mml:mi>J</mml:mi> <mml:mn>45</mml:mn> <mml:mo>−</mml:mo> <mml:mn>0.06</mml:mn> </mml:math> ( R 2 = 0.72, P < 0.001). The mean RMS errors for preoperative corneal astigmatism alone and the multivariate model were 0.58 D and 0.46 D, respectively. There was a statistically significant difference between them ( P = 0.02). Conclusions Refractive astigmatism after implantation of a toric IOL can be predicted by the regression model more accurately than by corneal astigmatism alone. However, the prediction of oblique astigmatism remains a challenge." @default.
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• W3134295114 date "2021-05-08" @default.
• W3134295114 modified "2023-10-14" @default.
• W3134295114 title "Prediction of postoperative refractive astigmatism before toric intraocular lens implantation" @default.
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