眼睛為人類最主要的器官之一，隨著年齡增長，眼球內主要調變焦距的構造─水晶體將逐漸硬化失去彈性而無法自動調整焦距，使看近物時變得模糊，此現象稱為老花眼(Presbyopia)，在看不同距離的物體時，需要的眼鏡屈光度不同因此必須更換不同焦距的眼鏡，使用上十分不方便，所以需要可變焦透鏡來改善此問題。
本論文將利用介電式液態透鏡之技術製作大尺寸的介電式液態透鏡，主要構造為兩不互溶、不同介電常數、不同折射率、相同密度的溶液，當外加電壓通過兩液體界面時，由介電常數差產生的介電力將使液體界面形變，改變曲率而調變焦距。大尺寸介電式液態透鏡未來將應用於製造可變焦老花眼鏡。
本實驗成功的製作出透光孔徑2.5公分、屈光度變化量2.6 D、驅動電壓40 V、反應時間30秒的介電式液態透鏡。但由於連續變化焦距之透鏡無法準確地停留在特定的位置，在調變的過程中發現液珠邊緣呈波浪狀，因此設計了第二代的階段式電極，使調變的過程中液珠的形狀能均勻而平滑，而本論文的階段式電極透光孔徑為2.6公分、每段屈光度變化分別為0.228 D、0.324 D、0.316 D、0.367 D，屈光度總變化量為1.24 D、驅動電壓30~40 V。

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