Anandakanda 1.19.8

1.19.8

dṛkpakṣmaṇoḥ parikṣepaḥ sa tu mātrā praśasyate /
mātrāṣṭādaśabhiḥ kāṣṭhā kāṣṭhātriṃśadyutā kalā //

The blinking of the eyelashes is celebrated as a mātrā; / a kāṣṭhā consists of eighteen mātrās; a kalā consists of thirty kāṣṭhās;