SB 11.15.20
caksus tvastari samyojya
tvastaram api caksusi
mam tatra manasa dhyayan
visvam pasyati duratah
Translation:
Merging one’s sight into the sun planet and then the sun planet into one’s eyes, one should meditate on Me as existing within the combination of sun and vision; thus one acquires the power to see any distant thing.