New method of quantifying corneal topographic astigmatism that corresponds with manifest refractive cylinder.
作者： Noel Alpins , James K.Y. Ong , George Stamatelatos
DOI: 10.1016/J.JCRS.2012.07.026
关键词:
摘要: PURPOSE: To derive a method of quantifying corneal topographic astigmatism (CorT) that accurately represents manifest refractive cylinder. SETTING: Private practice, Melbourne, Australia. DESIGN: Retrospective study. METHOD: Axial power measurements obtained using topography in right eyes and left were analyzed. For each Placido ring, an value was calculated. The ring values combined via vector summation to create new measure termed CorT. This parameter assessed against other commonly used measures the ocular residual (ORA) its standard deviation (SD) on how closely matched flat meridian CorT can also be conceptually divide cornea into 2 hemidivisions subsequently calculated for hemidivision cornea. RESULTS: ORA (0.62 diopters [D] G 0.33 [SD]) had better correlation with cylinderthan manual keratometry (K) (ORA 0.68G0.38 D), simulated K 0.70 G0.35 cornealwavefront(ORA0.74G0.36D),andparaxialcurvaturematching(ORA0.85G0.48D).TheSD significantly less than (P<.001). CONCLUSIONS: An alternative astigmatism, known as CorT, corresponded cylinder measures. A hemidivisional represent nonorthogonal asymmetrical irregular corneas. Financial Disclosure: Dr. Alpins Mr. Stamatelatos have financial interest ASSORT software program support planning analysis astigmatic correction. Ong is employee ASSORT.
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