atrodyotakarakumārilādayaḥ pramāṇayanti prāpyakāriṇī cakṣuḥśrotre bāhyendriyatvāt ghrāṇādivat /
Here, Uddyotakara, Kumārila and others argue: "The eye and ear must operate through contact because they are external sense organs, like the olfactory organ."