感光性亦稱光敏感度或光敏性(英語:Photosensitivity),是指一個物體在接收光子(多數時候爲可見光)時的反應程度。在醫藥學領域,感光性是指皮膚對於光的不正常反應,通常又分爲光照性皮炎與光毒性兩類[1][2]。哺乳類動物眼睛當中的光敏神經節細胞是一種單獨的光感細胞分類,與視覺功能中的感光細胞不同。
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