It's helpful to know that only infectious conjunctivitis (meaning pink eye caused by viruses or bacteria) is contagious.

Medically reviewed by Christine L. Larsen, MD Eye crust forms when mucus, oils, and debris accumulate, often during sleep.

However, skimping on sleep can lead to a range of health concerns, including puffy, swollen eyes. If you have ever woken up after a restless night with tired, swollen eyes, you are not alone.

According to the American Academy of Ophthalmology, glaucoma is a group of eye conditions that damage the optic nerve, often ...

Styes can cause crustiness, tearing, swelling, and a small spot ... can be normal (in the case of sleep crust), some eye crust may indicate an infection or eye condition that needs treatment.