Glasses look directly at the sun is more harmful, it is not recommended that a person’s eyes look directly at the sun, even if the time spent looking at the sun is very short, a few seconds or within a minute may cause damage to the retina. Because the sun’s rays of red, orange, yellow, green, green, blue, purple, from short-wave to long-wave can cause damage to people. Short-wave ultraviolet light, if focused on the human cornea for one minute can cause serious corneal burns, corneal epithelial detachment, resulting in electrophotographic ophthalmia, in addition, long-wave infrared light can pass through the corneal lens directly to the macular region of the retina, infrared light is a hot wavelength, will cause burns in the macular region. The photoreceptor cells will be damaged after the macular area burn, which will leave a black shadow in the eye even after treatment, and it is irreversible.