World Glaucoma Day is observed annually on March 12th to raise awareness of glaucoma, a group of eye diseases that can cause vision loss and blindness. The 2023 theme is "The world is bright, save your sight". Glaucoma occurs when fluid buildup in the eye increases pressure and damages the optic nerve, and it has no symptoms initially. Regular eye exams are important for detection. Risk factors include age over 40, family history, and certain medical conditions. Treatment options aim to lower pressure and prevent further vision loss.