नभःस्पृशं दीप्तमनेकवर्णं व्यात्ताननं दीप्तविशालनेत्रम्। दृष्ट्वा हि त्वां प्रव्यथितान्तरात्मा धृतिं न विन्दामि शमं च विष्णो ॥

nabhaḥ-spṛiśhaṁ dīptam aneka-varṇaṁ vyāttānanaṁ dīpta-viśhāla-netram dṛiṣhṭvā hi tvāṁ pravyathitāntar-ātmā dhṛitiṁ na vindāmi śhamaṁ cha viṣhṇo

Radiant, Thou touchest heaven, rainbow-hued, With opened mouths and shining vast-orbed eyes. My inmost self is quaking, having seen, My strength is withered, Vishnu, and my peace.

In plain words: Arjuna says Krishna's form reaches the sky, glowing with many colors, with open mouths and huge shining eyes. Seeing this, Arjuna's heart is shaking, and he has lost his strength and his peace of mind. He calls Krishna Vishnu here.