Matsayin intraocular shine matsewar ruwa a cikin kwallin ido. Matsi ne da humor ɗin ruwa ke yi, ruwa mai tsabta wanda ke cika ɗakin gaban ido. Matsakaicin matsi na intraocular na yau da kullun a cikin mutane yana tsakanin 10 zuwa 21 mm Hg (milimita na mercury). Yawan matsi na intraocular na iya haifar da glaucoma, wanda rukuni ne na yanayin ido wanda zai iya haifar da lalacewar jijiyar gani da asarar gani.