It is a kind of to issue the contraction of source stimulating eye pupil, it is provided simultaneously with the lamp device of photography, interpretation and display pupil size (millimetre)； Including penholder, pupil size display screens, lamp source switch button, photography switch button, light mouth, phtographic lens. By light mouth and phtographic lens towards eye pupil, first press headlamp switch button, the light that light mouth issues can stimulate pupil contraction, it is then turned on photography switch button, phtographic lens can shoot pupil shape, and the image of pupil is transferred to system processor, and the line distance (millimetre) of pupil or so two o'clock is calculated with C language formula platform, the number of pupil size is presented in the display screens of what lamp side again, achievees the effect that immediately and accurately interpretation pupil size.一種能發出光源刺激眼睛瞳孔收縮，同時具備攝影、判讀與顯示瞳孔大小(公釐)的筆燈裝置；包括筆桿、瞳孔大小顯示螢幕、燈源開關按鈕、攝影開關按鈕、燈光口、攝影鏡頭。將燈光口與攝影鏡頭面向眼睛瞳孔，先按壓燈光開關按鈕，燈光口發出的燈光可刺激瞳孔收縮，再開啟攝影開關按鈕，攝影鏡頭會拍攝瞳孔形狀，瞳孔的影像被傳輸到系統處理器，並運用C語言程式平台計算瞳孔左右兩點的連線距離(公釐)，再將瞳孔大小的數字呈現於筆燈側面的顯示螢幕中，達到立即且準確判讀瞳孔大小的效果。
