Sensor and device including said sensor for obtaining, non-invasively, useful data to determine the functional characteristics of the cornea, in particular to establish a correlation between the impedance at different frequencies and the permeability of the endothelium and epithelium and stromal hydration level.本發明提供一種感測器及包含該感測器之裝置,其用於非侵入式獲得有用資料以測定角膜之功能特性,詳言之確定不同頻率下之阻抗與內皮及上皮之滲透性及基質水合作用程度之間的相關性。(無元件符號說明)