Rashi on Deuteronomy 28:32/רש"י על דברים כ״ח:ל״ב

1וכלות אליהם [AND THINE EYES SHALL SEE] AND LONG FOR THEM — i.e. they will look expectantly for them (the children) that they should return home, but they will not return. — Any desire that does not come to fulfillment is termed a “failing of the eyes” (cf. Deuteronomy 28:65).