俱舍論疏 2.187

2.187

論「又如鼻等至耳根亦爾」，此以鼻等合知，例眼等釋問：如人處在密闇室中，眼見闇色以不？答：必不能見，見色必因明故。處極闇處，開閉眼同，都無所見。若能見者，必有少明，然不能見逼眼闇色。

On the Śāstra's statement: "Furthermore, as with the nose and the rest [...] the ear faculty is also likewise": this uses the contact-cognition of the nose and the rest as an analogy to explain the eye and the rest. Question: When a person is inside a pitch-black room, does the eye see the darkness or not? Answer: It definitely cannot see, for seeing visible form must depend on light. In an extremely dark place, opening or closing the eyes is the same; nothing whatsoever is seen. If one can see, there must be a little light; however, one cannot see the darkness that presses directly against the eye.