When was blindness discovered?

Blindness, as a condition, has been recognized since ancient times, with references in various historical texts and medical writings. However, the understanding of blindness as a medical condition evolved significantly over the centuries, particularly during the Renaissance when advancements in anatomy and medicine began to clarify its causes. The concept of blindness itself has existed as long as humans have been able to perceive and discuss vision, making it difficult to pinpoint an exact moment of "discovery."