nīlādibhyo yo bhedaścakṣuṣas tena bhedena śrotrādīnāṃ cakṣurādinā tulyatvāt / yathā cakṣur nīlāder vyāvṛttaṃ tathā śrotram apīti yāvat //
Because the difference that the eye has from blue etc. - with that same difference the ear etc. are equal to the eye etc.; that is, just as the eye is excluded from blue etc., so too is the ear.