Re: [心得] 近用眼鏡配置新概念

看板optical (眼鏡)作者 (marmotte )時間15年前 (2011/06/18 21:36), 編輯推噓1(1015)
留言16則, 2人參與, 最新討論串4/4 (看更多)

06/18 17:01,
要用fixation disparity分析,調節輻輳模型、眼位等的...
06/18 17:01

06/18 17:01,
還真是沒什麼用...
06/18 17:01

06/18 17:02,
請教(模糊影像融合所需的輻輳負擔低於清晰影像)如何證明?
06/18 17:02

06/18 17:12,
FD在教科書中算是另一個大家很陌生的門派吧....
06/18 17:12

06/18 17:13,
因為測量需要特定儀器...不易取得
06/18 17:13
是啊 :) 您懂我的意思了..我想我舉的例子應該簡單易懂.. 傳統驗光程序沒有將fixation disparity的影響納入.. 因為先前許多版友來配鏡.. 我用輻輳調節模型式的結果給予試鏡架處方.. 卻發現還是出現輻輳疲勞之相關症狀.. 一開始不知道是哪邊出了問題..想解決但摸不著頭緒.. 後來才慢慢意會到是fixation disparity的影響.. =========================================================================== "模糊影像融合所需的輻輳負擔低於清晰影像"相關論文 [Dark vergence in relation to fixation disparity at different luminance and blur levels ] by Wolfgang Jaschinski-Kruza Abstract Fixation disparity was measured psychophysically when subjects viewed a central fusion stimulus at 50 cm distance. Reducing luminance and increasing target blur resulted in an exophoric shift of fixation disparity. Fixation disparity was significantly more exophoric in subjects with distant dark vergence, i.e. the resting position of vergence. This was true for the bright and sharp target, as well as for targets impaired by blurring or dimming. These results are interpreted as a bias of fixation disparity towards the individual resting position of vergence not only for degraded stimuli but also for strong central fusion stimuli. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.168.84.67

06/19 15:23, , 1F
模糊或暗光下的FD會朝外斜偏差,未說明內斜是否也朝外斜偏
06/19 15:23, 1F

06/19 15:25, , 2F
所以對眼位不正的處理方式以FD來看就是"適當的模糊"?
06/19 15:25, 2F

06/19 15:51, , 3F
您注意看內文摘要.."觀察50cm處物體"呈現外偏斜 :)
06/19 15:51, 3F

06/19 15:55, , 4F
模糊狀態..FD較高..輻輳負擔會較低..
06/19 15:55, 4F

06/19 15:57, , 5F
清晰狀態..FD較低..輻輳負擔會較高..可給予稜鏡舒緩..
06/19 15:57, 5F

06/19 16:35, , 6F
exophoric shift->FD朝exo移動->不管屬ortho、eso、exo FD?
06/19 16:35, 6F

06/19 16:38, , 7F
或指exo往更exo shift /eso往更eso shift? 容忍值變大?
06/19 16:38, 7F

06/20 03:45, , 8F
我想這實驗結果詮釋方式可以如下述..
06/20 03:45, 8F

06/20 03:48, , 9F
如果調節輻輳模型式預估觀察某點所需輻輳量為C(total)
06/20 03:48, 9F

06/20 03:52, , 10F
令真實輻輳負擔為C(real)..則 C(total) = C(real) + FD
06/20 03:52, 10F

06/20 03:53, , 11F
|C(total)| > | C(real)| , 且 C(total)*C(real) > 0
06/20 03:53, 11F

06/20 03:55, , 12F
|FD| α [blur level] # FD的絕對值和模糊程度成正相關
06/20 03:55, 12F
※ 編輯: kramnik 來自: 220.134.2.79 (06/20 04:06)

06/20 11:27, , 13F
您了解FD和associated phoria的不同嗎?
06/20 11:27, 13F

06/20 11:28, , 14F
FD的值非常小(相較於聚合量)
06/20 11:28, 14F

06/20 11:38, , 15F
FD越大,超出panum's fusional area即會出現複影
06/20 11:38, 15F

06/22 03:12, , 16F
恩..學習ing..
06/22 03:12, 16F
文章代碼(AID): #1D_AdBg6 (optical)
文章代碼(AID): #1D_AdBg6 (optical)