Spiritually, many people go blind after seeing the worst sight of their lives. For example, if a husband sees his wife committing adultery, he will naturally hate her. If the husband gives in to this hatred, anger, and bitterness instead of turning to the Lord and receiving the miracle of forgiving his wife, the husband will begin to lose his spiritual sight. He will be blinded by the darkness (1 Jn 2:11).
We all have seen things that almost make us not want to see again. When we are in danger of becoming spiritually blinded by sin and the god of the present age (2 Cor 4:4), we must fix our eyes on Jesus, the Beginning and the End of our faith (Heb 12:2, our transl). Jesus alone is the "Sight for sore eyes" Who heals us. Jesus alone wipes away every tear from our eyes (Rv 7:17). Jesus alone makes the blind see.
If you have seen such sin and injustice that it seems too painful to see again, "see Jesus crowned with glory and honor because He suffered death" (Heb 2:9). "See, He comes amid the clouds! Every eye shall see Him, even of those who pierced Him" (Rv 1:7). See Jesus!