Custody of the eyes would mean not becoming part of the gappers blocks to oggle the wreck on the highway for the pleasure it provides as an entertainment paid for by another's tragedy. The evening news "if it bleeds it leads".  Sufferings that don't touch the heart but simply glaze over the eyes until the soul is numb. Custody of the eyes is what keeps the heart from turning the world into 'life tv' that we surf through constantly changing the channel looking for? what? Custody of eyes is how I find the planks in my own eye so I can maybe one day share that wisdom with someone suffering their speck.  Custody of the eyes awakens the heart and the mind, and raise to new importance the recognition of the face of Christ in the mystery of the present moment. 
"You will touch with the hand of faith, the finger of desire, the embrace of devotion; you will touch with the eye of the mind"    Bernard of Clairvaux
 "a heightened sensitivity to sensory experience as a means of communion... "