非球面隱形眼鏡的真實性與否 - 眼鏡
By Emma
at 2009-11-27T17:11
at 2009-11-27T17:11
Table of Contents
受測非球面隱形眼鏡
品牌名稱 製造廠商
Definition A.C Cooper vision
Frequency 55 Cooper vision
Choice A.B CIBA vision
Biomedics 55 Ocular Sciences
經過實體wavefront檢測..
酷柏的上述兩款非球面..視康的上述一款非球面..
幾乎完全沒有矯正殘餘4階球差的效果..僅是噱頭..
Ocular Sciences的biomedics 55非球面隱形眼鏡..矯正4階球差效果顯著..
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資料來源:http://www.clspectrum.com/article.aspx?article=12770
Aspheric Contact Lenses: Fact and Fiction
An examination of whether soft aspheric contact lenses can correct
astigmatism and spherical aberration.
By Pete Kollbaum, OD, FAAO and Arthur Bradley, PhD
實驗對象: 36 eyes with varying amounts of sphere power and less than -0.50D
of astigmatism
其使用wave front技術,將其他像差濾除,僅保留4階球差像。結果如下
http://www.clspectrum.com/archive/2005/March/Picture3.jpg
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上圖(a)
黑線:理想球面隱形眼鏡球差函數
proof:
球面折射面的低次方像差 http://www.wretch.cc/blog/kramnik1/13622391
球面薄透鏡的最小4次方球差計算 http://www.wretch.cc/blog/kramnik1/13627254
隱形眼鏡個別4階球差 http://www.wretch.cc/blog/kramnik1/13715919
紅線:完美全屈光系統球差函數
藍線:實際人眼球差平均函數之負值
proof:
人眼4階球差 ptt optical版 12074篇
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非球面設計方式
隱形眼鏡個別4階球差弭除設計 ptt optical版 11980篇
像差,像點位移誤差展開式互換推導 http://www.wretch.cc/blog/kramnik1/13622399
非球面隱形眼鏡設計 http://www.wretch.cc/blog/kramnik1/13715920
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上圖(B)(C)函數意義
測試全屈光系統球差函數減掉實際人眼球差平均函數
右圖(B)
各品牌球面鏡片測試結果
右圖(c)
各品牌非球面鏡片測試結果
可看出僅有Biomedics 55有弭除4階球差的效果,其餘非球面鏡片僅是噱頭
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