Your eyes don't see a mirror image of the world. The images projected onto your retinas are upside down and reversed, but your brain processes them to make them appear right-side up and correctly oriented.
When you blink, both of your eyes close simultaneously, thanks to a coordination system in your brain. This prevents you from experiencing a moment of darkness when blinking.
It takes about 20-30 minutes for your eyes to fully adapt to darkness. This adaptation process involves the pupils dilating and the rods in your retina becoming more sensitive to low light conditions.
Tear production not only keeps your eyes moist but also helps regulate their temperature. Tears are evaporated off the surface of the eye, cooling it in the process.
During the REM stage of sleep, your eyes move rapidly. This is when you experience vivid dreams. Interestingly, other muscles in your body are temporarily paralyzed during REM sleep to prevent you from acting out your dreams.
The human brain can process visual information incredibly quickly. It can recognize and interpret an image in as little as 13 milliseconds.
The shape of your eye can change slightly throughout your lifetime. Factors like age, hormonal changes, and disease can alter the curvature of the cornea, affecting your vision.
Women are often better at discriminating between subtle differences in color than men. This is thought to be related to the presence of more cones (color-sensitive cells) in the female retina.
While the human eye can't see infrared light naturally, some animals, such as certain snakes and insects, can detect infrared radiation. Infrared-sensitive cameras can help us visualize this otherwise invisible spectrum.
The retina is the only part of the body where blood vessels can be directly observed without surgery. An eye doctor can use a technique called ophthalmoscopy to view these vessels and assess overall health.