Valmiki Ramayana Ayodhya Kanda Sarga 46 Shloka 6
Original Shlokaपितरं चानुशोचामि मातरं च यशस्विनीम्। अपि वान्धौ भवेतां तु रुदन्तौ तावभीक्ष्णशः।।2.46.6।।
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पितरं च also father, यशस्विनीम् illustrious, मातरं च also mother, अनुशोचामि I am distressed, तौ both of them, अभीक्ष्णशः repeatedly, रुदन्तौ while weeping, अन्धौ blind, अपि वा भवेताम् will they become.
What distresses me is the thought that both father and illustrious mother may become blind by repeated weeping (over us).