近用眼鏡配置新概念 - 眼鏡
By Candice
at 2011-06-13T00:18
at 2011-06-13T00:18
Table of Contents
一位蔡姓版友的案例分享給大家..
我們花了一整個星期六晚上來做實驗..
------------------------------------------------------------------
蔡姓板友年齡約為23歲..
原眼鏡處方為
R:-650 視力 0.5 紅
L:-575 視力 0.3 紅
光心間距:61mm
症狀:視遠模糊..
真實度數
R:-725~-750
L:-725~-750
瞳孔間距:61mm
眼位:正位
新眼鏡視遠處方(影像晃動抑制良好)
R:-675 視力 0.8 紅
L:-675 視力 0.8 紅
光心間距:61mm
------------------------------------------------------------------------
這個新眼鏡處方於看遠時..相當的好..
視力足夠..調節負擔為0..輻輳負擔為0..
然而這附眼鏡於視近用會出現問題..
不是在於調節負擔加重..因為此附眼鏡理論上和實測上都顯示調節負擔極低(近乎於0)
雙眼降度表[以無限遠處雙眼mpmva為基準]
檢測距離 20歲 25歲 30歲 35歲 40歲 45歲 50歲
6m +7度 +8度 +10度 +11度 +13度 +14度 +16度
3m +13度 +16度 +19度 +22度 +25度 +28度 +31度
2m +20度 +25度 +29度 +34度 +38度 +43度 +47度
1m +40度 +49度 +58度 +67度 +76度 +85度 +94度
0.75m +53度 +65度 +77度 +89度 +101度 +113度 +125度
0.67m +60度 +74度 +87度 +101度 +114度 +128度 +141度
0.5m +80度 +98度 +116度 +134度 +152度 +170度 +188度
0.4m +100度 +123度 +145度 +168度 +190度 +213度 +235度
0.33m +120度 +147度 +174度 +201度 +228度 +255度 +282度
蔡姓版友BCC(binocular cross cylinder test)實測結果也顯示無調節落後..
再給予額外降度量25度即會顯示影像座落在視網膜前方..
而是在於內集輻輳負擔"變大"了..
原處方降度量過高..導致即使在近用工作距離內..影像都是模糊的..
模糊影像的眼位不等程度(fixation disparity)較高..
所以原處方近用內集輻輳負擔並沒有那麼大..
但如今新處方在近用工作距離內..影像都是清晰的..
所以出現內集輻輳負擔疲勞的症狀..給予BI稜鏡處方馬上可以獲得舒緩..
類似案例為..
外斜位偏斜量值較高的配戴者讓其視遠清晰後..還必須給予BI稜鏡才會舒適..
雖然模型式顯示新眼鏡內集輻輳負擔並沒有增加..
但是考慮fixation disparity的問題..還是必須給予BI稜鏡..
==========================================================================
給予蔡先生視近眼鏡處方為
R:-650 1.5ΔBI
L:-650 1.5ΔBI
光心間距:61mm
#實際上是給予等效近似處方
R:-650
L:-650
光心間距:65mm
-------------------------------------------------------------------------
根據Adrian S. Bruce, David A. Atchison, and Harsha Bhoola所發表的研究報告
Accommodation and Convergence relationships and age,
我們可以建立個簡化算式來描述AC/C和CA/A與年齡的關係
設年齡為Z
CA/C =[ 0.1 - 0.003*(Z-20)] D/Δ
≒ 0.09
鏡片處方降度25度..給予輻輳性負調節25度..必須給予3ΔBI(等效光心外移4mm)
0.25 ÷0.09 ≒ 3
=====================================================================
新眼鏡視遠處方
R:-675 視力 0.8 紅
L:-675 視力 0.8 紅
光心間距:61mm
視遠:視力足夠..調節負擔為0..輻輳負擔為0..
視近:視力足夠..調節負擔為0..內集輻輳負擔較原處方大..
新眼鏡視近處方
R:-650
L:-650
光心間距:65mm
視遠:視力足夠..調節負擔為0..開散輻輳負擔較原處方大..
視近:視力足夠..調節負擔為0..內集輻輳負擔獲得舒緩..
額外優點:影像較視遠眼鏡來得大一些..
==================================================================
Gullstrand模型眼
http://research.opt.indiana.edu/Library/INEye/figs/Image01.gif
http://www.telescope-optics.net/images/eye_optics2.PNG
http://www.chinabaike.com/article/UploadPic/2008-1/2008111131531664.jpg
我們可以知道
眼鏡鏡片的張角橫向放大率變化近似為 ΔF*0.017
隱形眼鏡和雷射屈正手術橫向放大率近似為 ΔF*0.005
調節反應和晶體置換手術橫向放大率近似為 -ΔF*0.0035
再根據optical版 #1Dxu4R9j篇
藉由輻輳性調節ΔF來取代眼鏡鏡片ΔF..
可以額外獲得 ΔF*0.0205的影像放大程度..
--
我們花了一整個星期六晚上來做實驗..
------------------------------------------------------------------
蔡姓板友年齡約為23歲..
原眼鏡處方為
R:-650 視力 0.5 紅
L:-575 視力 0.3 紅
光心間距:61mm
症狀:視遠模糊..
真實度數
R:-725~-750
L:-725~-750
瞳孔間距:61mm
眼位:正位
新眼鏡視遠處方(影像晃動抑制良好)
R:-675 視力 0.8 紅
L:-675 視力 0.8 紅
光心間距:61mm
------------------------------------------------------------------------
這個新眼鏡處方於看遠時..相當的好..
視力足夠..調節負擔為0..輻輳負擔為0..
然而這附眼鏡於視近用會出現問題..
不是在於調節負擔加重..因為此附眼鏡理論上和實測上都顯示調節負擔極低(近乎於0)
雙眼降度表[以無限遠處雙眼mpmva為基準]
檢測距離 20歲 25歲 30歲 35歲 40歲 45歲 50歲
6m +7度 +8度 +10度 +11度 +13度 +14度 +16度
3m +13度 +16度 +19度 +22度 +25度 +28度 +31度
2m +20度 +25度 +29度 +34度 +38度 +43度 +47度
1m +40度 +49度 +58度 +67度 +76度 +85度 +94度
0.75m +53度 +65度 +77度 +89度 +101度 +113度 +125度
0.67m +60度 +74度 +87度 +101度 +114度 +128度 +141度
0.5m +80度 +98度 +116度 +134度 +152度 +170度 +188度
0.4m +100度 +123度 +145度 +168度 +190度 +213度 +235度
0.33m +120度 +147度 +174度 +201度 +228度 +255度 +282度
蔡姓版友BCC(binocular cross cylinder test)實測結果也顯示無調節落後..
再給予額外降度量25度即會顯示影像座落在視網膜前方..
而是在於內集輻輳負擔"變大"了..
原處方降度量過高..導致即使在近用工作距離內..影像都是模糊的..
模糊影像的眼位不等程度(fixation disparity)較高..
所以原處方近用內集輻輳負擔並沒有那麼大..
但如今新處方在近用工作距離內..影像都是清晰的..
所以出現內集輻輳負擔疲勞的症狀..給予BI稜鏡處方馬上可以獲得舒緩..
類似案例為..
外斜位偏斜量值較高的配戴者讓其視遠清晰後..還必須給予BI稜鏡才會舒適..
雖然模型式顯示新眼鏡內集輻輳負擔並沒有增加..
但是考慮fixation disparity的問題..還是必須給予BI稜鏡..
==========================================================================
給予蔡先生視近眼鏡處方為
R:-650 1.5ΔBI
L:-650 1.5ΔBI
光心間距:61mm
#實際上是給予等效近似處方
R:-650
L:-650
光心間距:65mm
-------------------------------------------------------------------------
根據Adrian S. Bruce, David A. Atchison, and Harsha Bhoola所發表的研究報告
Accommodation and Convergence relationships and age,
我們可以建立個簡化算式來描述AC/C和CA/A與年齡的關係
設年齡為Z
CA/C =[ 0.1 - 0.003*(Z-20)] D/Δ
≒ 0.09
鏡片處方降度25度..給予輻輳性負調節25度..必須給予3ΔBI(等效光心外移4mm)
0.25 ÷0.09 ≒ 3
=====================================================================
新眼鏡視遠處方
R:-675 視力 0.8 紅
L:-675 視力 0.8 紅
光心間距:61mm
視遠:視力足夠..調節負擔為0..輻輳負擔為0..
視近:視力足夠..調節負擔為0..內集輻輳負擔較原處方大..
新眼鏡視近處方
R:-650
L:-650
光心間距:65mm
視遠:視力足夠..調節負擔為0..開散輻輳負擔較原處方大..
視近:視力足夠..調節負擔為0..內集輻輳負擔獲得舒緩..
額外優點:影像較視遠眼鏡來得大一些..
==================================================================
Gullstrand模型眼
http://research.opt.indiana.edu/Library/INEye/figs/Image01.gif
http://www.telescope-optics.net/images/eye_optics2.PNG
http://www.chinabaike.com/article/UploadPic/2008-1/2008111131531664.jpg
我們可以知道
眼鏡鏡片的張角橫向放大率變化近似為 ΔF*0.017
隱形眼鏡和雷射屈正手術橫向放大率近似為 ΔF*0.005
調節反應和晶體置換手術橫向放大率近似為 -ΔF*0.0035
再根據optical版 #1Dxu4R9j篇
藉由輻輳性調節ΔF來取代眼鏡鏡片ΔF..
可以額外獲得 ΔF*0.0205的影像放大程度..
--
Tags:
眼鏡
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