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There are many reasons for red, or bloodshot, eyes. From too little sleep to irritation or infection, the underlying causes are many. There are many eye drops on the market that can effectively reduce the discoloration. 

Astigmatism is a refractive error that distorts or blurs vision. It’s very common and is usually caused by an abnormally shaped cornea. The condition is treated in several ways, including eyeglasses, contact lenses, or laser vision correction.

Peripapillary atrophy (PPA) is an eye condition caused when certain tissues around the optic nerve become thinner. It rarely has any symptoms and is usually spotted during a regular eye examination.

Styes are a common eye condition caused by infection. While they can be irritating, they’re not usually serious—although in rare situations they can spread and cause more widespread issues.

Ocular migraines—often called retinal migraines—are a rarer type of migraine that causes visual disturbances in one eye. They are more common in women than men and can cause a variety of symptoms, including a headache.

The most common eye surgery is, without a doubt, the cataract operation. At least 4 million are performed annually in the U.S. alone, and more than 30 million on a global scale.