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A Twitter user posted an image of the ambiguous cylinder Illusion, pictured above, and people are confused.

An optical illusion that seems to be both a circle and a square is baffling the internet — here’s how it works

"How can it be square AND circular?" Asked one confused viewer. This optical illusion has actually baffled the internet before.
He now regrets ever wearing contacts.

A man went blind after contracting a parasite from showering with his contacts in

Nick Humphreys, a 29-year-old man from the UK, contracted Acanthamoeba keratitis, which is an infection caused by an amoeba found in water.
If your eyes have been bugging you a bit, you could need glasses.

8 signs you could need glasses, even if you don’t think you do

From having watery eyes to experiencing frequent headaches, here are some common signs you could need glasses.
A man's eyes were seriously damaged by a large dose of a popular erectile dysfunction drug.

A man who overdosed on erectile dysfunction medicine now has red-tinted vision — and doctors say it’s ‘irreversible’

A 31-year-old man now sees everything with a red tint after a high dose of erectile dysfunction medication damaged his color vision, according to a case study published in the journal Retinal Cases & Brief Reports. Despite various treatments, it hasn't improved a year after his diagnosis.

How cats see the world compared to humans

Artist Nickolay Lamm consulted hypothosizes how cats view the world compared to humans. They can see better in the dark but are nearsighted.

These graphs show how much Americans were freaking out about vision loss after the eclipse

According to Google Trends, search terms related to vision problems spiked in popularity Monday.

If your eyes hurt after watching the solar eclipse, here’s what you need to know

People usually notice symptoms of solar retinopathy — including blurry vision, discolored spots in vision, pain, or a loss of central vision — by the next day.

You can safely take a picture of the solar eclipse with your iPhone — but don’t use the camera to watch it

Your phone screen can reflect ultraviolet light back into your eye, potentially causing solar retinopathy — just as if you were looking directly at the sun.

What looking at the solar eclipse without glasses could do to your eyes

Eye damage from the eclipse primarily affects central vision. In some cases, damage goes away. In others, it's permanent. Here's how it works.

A new report says 39 million contact lens wearers are at risk for severe eye damage — but it’s largely preventable

6 out of 7 contact lens wearers engage in at least one habit that puts them at risk for serious eye infection, according to a new CDC report.