翻訳と辞書 Words near each other ・ Vertical World ・ Vertical-cavity surface-emitting laser ・ Vertical-external-cavity surface-emitting-laser ・ Vertical-lift bridge ・ Verticalization ・ Vertically challenged ・ Vertically Challenged (album) ・ Vertically integrated liquid ・ Vertically scrolling video game ・ Vertically transmitted infection ・ Vertex arrangement ・ Vertex Buffer Object ・ Vertex configuration ・ Vertex cover ・ Vertex cycle cover ・ Vertex distance ・ Vertex enumeration problem ・ Vertex figure ・ Vertex function ・ Vertex Group ・ Vertex Inc ・ Vertex model ・ Vertex normal ・ Vertex of a representation ・ Vertex operator algebra ・ Vertex Pharmaceuticals ・ Vertex pipeline ・ Vertex separator ・ Vertex-transitive graph ・ VertexFX Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Vertex distance ： ウィキペディア英語版 Vertex distance Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to the eye. Since most refractions are performed at a vertex distance of 14 mm, the power of a corrective device fitted at a different vertex distance may need to be compensated to effect the same correction of the initial refraction (note: refraction is portion of an eye exam that is performed with a phoropter). Vertex distance is important when converting between contact lens and glasses prescriptions and becomes significant if the glasses prescription is +/-4.00D or more. The focal point of the correcting lens needs to be at the far point of the eye. The formula for vertex correction is Fc=F/(1-xF), where Fc is the power corrected for vertex distance, F is the original lens power, and x is the change in vertex distance in meters. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vertex distance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.