This document discusses several common eye defects and diseases: myopia (nearsightedness), hypermetropia (farsightedness), night blindness caused by vitamin A deficiency, xerophthalmia from prolonged vitamin A deficiency causing blindness, color blindness from defects in cone cells, glaucoma caused by increased pressure inside the eyes damaging the retina, cataracts making the lens opaque, and conjunctivitis which is an infection of the conjunctiva. It also provides tips for keeping eyes healthy such as eating well, quitting smoking, wearing sunglasses, keeping screens at a distance, and visiting an eye doctor.