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10.1097/OPX.0000000000000946 http://scihub22266oqcxt.onion/10.1097/OPX.0000000000000946 C5003335!5003335!27564515     free     free     free Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       Optom+Vis+Sci 2016 ; 93 (9): 1079-92 Nephropedia Template TP {{tp|p=27564515|t=2016. Internal Astigmatism in Myopes and Non-myopes: Compensation or Constant?|pdf=|usr=}}{{27564515}} gab.com Text Internal Astigmatism in Myopes and Non-myopes: Compensation or Constant JO: Optom Vis Sci http://www.kidney.de/pget.php?&tw=1&pmid=27564515 #FOAvip Purpose: To examine internal astigmatism (IA) in myopes and non-myopes using a new method to assess compensation of corneal astigmatism (CA) by IA, to look for predictors of high IA in young adult myopes and determine if as CA changes IA changes to reduce refractive astigmatism (RA) in an active compensatory process in myopes. Methods: Right eye keratometry and cycloplegic autorefraction were measured annually over 14 years in 367 myopes and once in 204 non-myopes age- (mean 21.91 years ± 1.47), gender-, and ethnicity-matched to myopes at year 12. CA and RA at the corneal plane were expressed as J0, J45. IA = RA - CA. Inverse power transformation provided cylinder power and axis of IA for the compensation factor (IA/CA). Analyses included: 1) paired and unpaired t-tests (refractive data), 2) chi-square tests (distributions of compensation factor), 3) logistic regression analysis (predictors of high IA), and 4) linear mixed models (time effect on RA, CA and IA). Results: The magnitude of IAJ0 varied by refractive error (myopes ?0.25 ±0.24 vs non-myopes ?0.32 ± 0.21, p<0.001). Compensation of CA by IA was poorer in myopes than non-myopes (?2 p<0.001). When matched by CA, compensation remained poorer in myopes than non-myopes (?2 all p? 0.04). Within each refractive group compensation was better when CA was low than high (?2 p<0.001). When CA was low in myopes, high IA (?1.00D) was less likely (p=0.01). Longitudinal follow-up of myopes found no evidence for an active compensatory role for IA as CA increased over time. There were differences in IAJ0 by ethnicity over time (p<0.0001). Conclusions: In myopic and non-myopic eyes with low amounts of CA, IA may reduce CA?s contribution to RA, but IA is not a constant. However, there is no evidence for an active compensatory role for IA reducing CA in myopes. Twit Text FOAVip Internal Astigmatism in Myopes and Non-myopes: Compensation or Constant ????Optom Vis Sci http://www.kidney.de/pget.php?&tw=1&pmid=27564515 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=27564515 #FOAvip English Wikipedia <ref>{{Cite pmid|27564515}}</ref> Internal Astigmatism in Myopes and Non-myopes: Compensation or Constant? #MMPMID27564515 Manny RE; Deng L; Gwiazda J; Hyman L; Weissberg E; Scheiman M; Fern KD Optom Vis Sci 2016[Sep]; 93 (9): 1079-92 PMID27564515show ga Purpose: To examine internal astigmatism (IA) in myopes and non-myopes using a new method to assess compensation of corneal astigmatism (CA) by IA, to look for predictors of high IA in young adult myopes and determine if as CA changes IA changes to reduce refractive astigmatism (RA) in an active compensatory process in myopes. Methods: Right eye keratometry and cycloplegic autorefraction were measured annually over 14 years in 367 myopes and once in 204 non-myopes age- (mean 21.91 years ± 1.47), gender-, and ethnicity-matched to myopes at year 12. CA and RA at the corneal plane were expressed as J0, J45. IA = RA - CA. Inverse power transformation provided cylinder power and axis of IA for the compensation factor (IA/CA). Analyses included: 1) paired and unpaired t-tests (refractive data), 2) chi-square tests (distributions of compensation factor), 3) logistic regression analysis (predictors of high IA), and 4) linear mixed models (time effect on RA, CA and IA). Results: The magnitude of IAJ0 varied by refractive error (myopes ?0.25 ±0.24 vs non-myopes ?0.32 ± 0.21, p<0.001). Compensation of CA by IA was poorer in myopes than non-myopes (?2 p<0.001). When matched by CA, compensation remained poorer in myopes than non-myopes (?2 all p? 0.04). Within each refractive group compensation was better when CA was low than high (?2 p<0.001). When CA was low in myopes, high IA (?1.00D) was less likely (p=0.01). Longitudinal follow-up of myopes found no evidence for an active compensatory role for IA as CA increased over time. There were differences in IAJ0 by ethnicity over time (p<0.0001). Conclusions: In myopic and non-myopic eyes with low amounts of CA, IA may reduce CA?s contribution to RA, but IA is not a constant. However, there is no evidence for an active compensatory role for IA reducing CA in myopes. äInternal Astigmatism in Myopes and Non-myopes: Compensation or Constan(epmc).pdf DeepDyve Pubget Overpricing