{"title":"Initial selection of soft contact lenses based on corneal characteristics.","authors":"William A Douthwaite","doi":"10.1097/01.ICL.0000029342.53776.B1","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>To determine apical radius, surface asphericity, and horizontal visible iris diameters (HVID) in normal subjects and to find out which has the greatest influence on the corneal sagittal depth.</p><p><strong>Methods: </strong>Videokeratoscopic data were analyzed to determine the apical radius and the p-value of the near horizontal principal meridian for 73 right and 77 left eyes. The HVID also were measured.</p><p><strong>Results: </strong>Scatterplots of sagittal depth versus apical radius, p-value, and HVID indicated the strongest association between the sagittal depth and the HVID.</p><p><strong>Conclusions: </strong>Normal variations in corneal asphericity have the least influence whereas normal variations in HVID have the greatest influence in changing the corneal sagittal depth. The most appropriate measurement to take to select the optimum soft contact lens specification may be the HVID.</p>","PeriodicalId":22367,"journal":{"name":"The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, Inc","volume":"28 4","pages":"202-5"},"PeriodicalIF":0.0000,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, Inc","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1097/01.ICL.0000029342.53776.B1","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
Purpose: To determine apical radius, surface asphericity, and horizontal visible iris diameters (HVID) in normal subjects and to find out which has the greatest influence on the corneal sagittal depth.
Methods: Videokeratoscopic data were analyzed to determine the apical radius and the p-value of the near horizontal principal meridian for 73 right and 77 left eyes. The HVID also were measured.
Results: Scatterplots of sagittal depth versus apical radius, p-value, and HVID indicated the strongest association between the sagittal depth and the HVID.
Conclusions: Normal variations in corneal asphericity have the least influence whereas normal variations in HVID have the greatest influence in changing the corneal sagittal depth. The most appropriate measurement to take to select the optimum soft contact lens specification may be the HVID.
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