Is looking directly at the sun harmful to your eyes?

The "solar retinitis" in which the sun has been burned by its ultraviolet rays and infrared rays for a long time is almost incurable. Macula is the most sensitive part of retina, which makes light converge and makes the image clear. Once burned, the macula can never be recovered.

Extended data:

The human eye has a crystal structure, which has the same focusing and magnifying effects as a magnifying glass. Light passes through the eyes, and the heat energy of the sun is focused on the retina of the fundus through the lens. If the heat energy is too large, the eyes will feel dazzling.

The sunlight is very strong, and the lens and vitreous of the eyeball are equivalent to a condenser (convex lens). When the eyes look directly at the sun, the sunlight will converge into a small light spot with strong light energy through the lens and vitreous body, and it will fall on the retina behind the eyeball, which will easily burn the retina and cause serious damage to the eyes, so the eyes cannot look directly at the sun.