Chasidut zu Tehillim 33:18

Delightful Love is sometimes symbolized in the Torah by lovebirds or doves, which delight in each other and stare at one another continuously (see Song of Songs 1:15, “your eyes are doves’ [eyes].”) It is as though the two lovers “cannot take their eyes off of one another,” and gaze at each other with total rapture until their eyes become bloodshot and red. This is also what is meant by the parallel verses (Psalms 25:15), “my eyes are constantly upon G-d,” and (Psalms 33:18), “the eye of G-d is upon those who fear Him.” Our verse, too, referring to “eyes bloodshot from wine,” is speaking of the degree of Delightful Love which results after one has succeeded, through the wine of Torah, in bringing out the Great Love “hidden” within one’s soul. (This is also the level of love meant by the Kabbalistic expression, “to gaze at the glory of the King [G-d].”)