וְעֵינֵ֥י לֵאָ֖ה רַכּ֑וֹת וְרָחֵל֙ הָֽיְתָ֔ה יְפַת־תֹּ֖אַר וִיפַ֥ת מַרְאֶֽה׃
And Leah’s eyes were weak; but Rachel was of beautiful form and fair to look upon.
Read kabbalistic (mystical) interpretation of Genesis 29:17: and classical mystical sources.