Why You Shouldn’t Look at a Solar Eclipse

Looking directly at the sun during a solar eclipse can injure your eyes because the retina can be damaged by intense visible and ultraviolet light, even when the sun appears partially covered. The eye focuses sunlight onto the retina, and even a thin crescent of the eclipsed sun can deliver enough energy to cause solar retinopathy, a condition that may create lasting blind spots or distorted vision. Unlike the abrupt pain that signals a burn, retinal damage from solar viewing is painless and often noticed only afterward. This explains why expert guidance stresses using only properly tested solar filters, such as ISO 12312-2 eclipse glasses or handheld solar viewers, and avoiding unfiltered optical devices.