With summer approaching, we can look forward to warmer weather and more time outside in the sun. That means it’s time to take the sunglasses out — and it’s not just people who love them.

Sunglasses are by far not the worst things people make their pets wear. They’re not dangerous, they don’t hinder movement and they might actually protect their eyes. According to the American Optometric Association, exposure to the sun’s UV radiation can cause photokeratitis — a “sunburn of the eye” that results in temporary red eyes and sensitivity to light. Over time, too much exposure can lead to increased chances of cataracts and retina damage.

To protect your eyes, use glasses with gray lenses that block out 99 to 100 percent of both UV-A and UV-B radiation. Or, just stay inside and enjoy these pictures of animals with their favorite sun specs.