Āpta Pramāṇa - आप पम्ग Kumbhaka Paddhathih, Verse 191🔗

सकुूष-सनच्ग च्पनच्व्च्चसेग पनरचेूष| व्रचेच-षच पचतेिेरेचचेूषकमूसष-ूथ् || िे्-कुम इनू ख्ून कमूो वुयम्दष-अनप ||१९१|| Sakr̥t-sūryeṇa cāpūrya dhārya candreṇa pūrayet| Dhārayec-ca prayatnene recayet kramatas-tathā || Netra-kumbha iti khyātaḥ kramato vyutkramād-api ||191||

Akashic Revelation

One should inhae once through Sūrya-nāḍi, hold the breath and again inhale through candra nadi and then after holding the breath exhale in the same order. This is known as Netra Kumbhaka. This is done also in the reverse order