軟式多焦點vs硬式多焦點 - 眼鏡
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By Jacob
at 2010-03-06T13:47
at 2010-03-06T13:47
Table of Contents
→ sazana:horopter與多焦點設計之間的關係可否解釋詳細一些?03/05 15:04
對於正位的人..
當視線夾角為0度時..所需表現幅輳量為0..
http://www.wretch.cc/album/show.php?i=kramnik1&b=14&f=1210827354&p=26
當視線夾角越大..所需表現幅輳量越大..
http://www.wretch.cc/album/show.php?i=kramnik1&b=14&f=1210827355&p=27
對於離觀察者相同距離的Vieth Muller圓環線..
如下圖所示..我們可以看出直看與斜看所需表現幅輳量不一樣..
http://www.wretch.cc/album/show.php?i=kramnik1&b=14&f=1210827356&p=28
由調節幅輳模型式可知..
直看時幅輳性調節量會比斜看來得高..
也就是對於同視點曲面..直看會比斜看來得近..
所以"在臨床驗證上,同視點實際上會比Vieth-Muller圓較平坦"
然而跟據Adrian S. Bruce, David A. Atchison, and Harsha Bhoola
所發表的研究報告Accommodation and Convergence relationships and age
設年齡為Z
CA/C =[ 0.1 - 0.003*(Z-20)] D/Δ
可知 CA/C值隨著年齡增加而遞減..
這代表幅輳性調節量隨著年齡增加而降低..
我們可以發現超過55歲之後幅輳性調節幾乎喪失..
此時同視點曲面就會等同Vieth-Muller圓..
模型式推演同視點曲面
proof:http://www.wretch.cc/blog/kramnik1/13784444
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眼鏡
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By Steve
at 2010-03-07T21:01
at 2010-03-07T21:01
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By Harry
at 2010-03-06T12:03
at 2010-03-06T12:03
看東西會變形~
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By Kelly
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at 2010-03-06T10:51
怒!店家是把鏡片配反了嗎?
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at 2010-03-06T05:14
去集文堂逛的這幾支...?
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By Hedwig
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at 2010-03-06T03:45