The influence of different corneal diameters on Pentacam systemcombined with Corvis ST
Objective To explore the effect of differentcorneal diameter on Belin/Ambrósio enhanced ectasia dis-play(BAD)and Corvis ST.Methods Retrospective case study.This study recruited 132 eyes(72 males and 60 fe-males),who had completed preoperative examination before corneal refractive surgery at our center from January to June 2021.Age was(25.41±6.12)years old and No patients had keratoconus.All the patients recruited were divided into two groups according to the corneal diameter measured by the Pentacam system(WTW).Group A included 66 eye swith corneal diameter≤11.5 mm;group B also included 66 eyes whose corneal diameter is≥11.6 mm.Central corneal thickness(CCT),the deviation of front elevation difference map(Df),deviation of back elevation difference map(Db),deviation of average pachymetric progression index(Dp),deviation of minimum thickness(Dt),deviation of Ambrósio′s relational thickness maximum(Da)and overall deviation value(Do)of BAD parameters were measured by Pentacam.The Corvis ST parameters included Integr.Radius,corneal thickness thinnest/pachymetric progression(ARTh),the ratio of deformation amplitude(DA ratio),resultant pressure divided by deflection amplitude at the first applanation(SPA1),the Corvis Bio-mechanical Index(CBI)and tomographic and biomechanical index(TBI).The preoperative BAD parameters and Corvis ST parameters between these two groups were analyzed with independent sample T test.Results In groupsA and B,CCT was 533.38±31.16 and 552.66±31.55;Df was 1.02±0.99 and 0.92±1.46;Db was 1.74±1.97 and 0.61±1.15;Dp was 1.67±0.75 and 1.27±1.34;Dt was-0.37±0.86 and 0.18±0.89;Da was 0.63±0.62 and 0.78±0.76;Do was 1.70±0.51 and 1.32±0.85.DA Ratio was 4.14±0.40 and 4.14±0.46;ARTH was 437.04±76.60 and 470.46±103.36;SPA1 was 99.80±17.27 and 96.31±17.36;CBI was 0.36±0.18 and 0.30±0.21;TBI was 0.42±0.21 and 0.44±0.28,respectively.The BAD param-eters of Dt,Db,Dp,CCT and Do were all significantly different between these two groups(all P<0.05).The Corvis param-eters of ARTH were also significantly different between these two groups(P<0.05).Conclusions Different corneal diam-eter had a crucial influence on BAD and Corvis ST.
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