yadyevaṃ na tarhīndriya{sva}rūpam evānyanirapekṣaṃ kāraṇaṃ siddhyati, satyapi tasminnavikale prāmāṇyākhyakāryānutpatteḥ /
If this is so, then the mere nature of the sense organ by itself cannot be established as an independent cause, because even when it exists unimpaired, [its] effect called validity does not arise.