Without protective gear, looking directly at an eclipse can cause serious damage or scarring to the eyes. “Solar retinopathy is a photochemical injury to your retina,” Dr. Nicole Bajic, a surgical ophthalmologist at the Cleveland Clinic, previously told TIME via email.

There are two types of eclipses—solar eclipses and lunar eclipses. A lunar eclipse occurs when the Earth comes in between the Sun and the Moon. On the other hand, a solar eclips