The sun is basically a single, large, continuous explosion, and people normally avoids looking directly at it. There’s a good reason for that, besides the headaches and temporary vision distortion that visible sunlight produces. Ultraviolet sunlight can cause a number of eye disorders, according to the Cleveland Clinic, including macular degeneration, solar retinitis and corneal dystrophies. Moreover, the effects are cumulative, so looking at the sun twice is twice as bad for your eyes as looking at it once, even if you look on different days.Looking at the sun during an eclipse is more dangerous than looking at full sun. The darkness that accompanies an eclipse can stop the natural reflex to squint and look away , increasing the amount of ultraviolet radiation landing on the eye and making it more likely that you’ll get eye damage. Your eyes can sustain damage even if only a small sliver of the sun is visible. The cornea focuses sunlight on the retina and scorches it, and because the retina has no pain receptors, you don’t know the damage has been done until it’s too late. so that’s why you shouldn’t look at a solar eclipse without your special sunglasses.