The Macula: The Tiny Retinal Patch Behind Sharp Sight Your retina lines the inside of your eye like wallpaper, wrapping around a wide curved surface. Yet almost everything you would call real seeing comes from one small patch near the middle of it. That ... Eye Anatomy Retina Oct 3, 2025
Monolids and Double Eyelids: How the Crease Works Look closely at any group of people and you will see two broad patterns in the upper eyelid. Some lids carry a visible fold, a line that appears above the lash line and deepens when the eye opens. Oth... Eye Anatomy Eyelids Oct 2, 2025
The Most Common Eye Color in the World, and Why Ask a room of people to guess the world's most common eye color and most of them get it right on the first try. Brown wins, and it is not a close contest. What surprises people is how lopsided the spl... Eye Anatomy Eye Color Pupil and Iris Oct 1, 2025
The Optic Chiasm: Where Your Two Eyes Become One View Your left eye and your right eye each send their own signal toward the brain, and those two signals have to be sorted before they can turn into one steady picture. That sorting happens at a small X-sh... Eye Anatomy Optic Nerve Retina Sep 30, 2025
The Optic Nerve and Optic Disc: What Your Doctor Sees When an eye doctor shines a light into your eye and stares for a while, the thing they are studying most closely is the head of your optic nerve. It is the one part of your nervous system that can be ... Eye Anatomy Optic Nerve Retina Sep 29, 2025
The Bones Around Your Eye and How They Can Break Your eye sits in a cone-shaped hollow in the skull, and that hollow is not carved from a single piece of bone. It is assembled from seven separate bones that meet along seams, and they are not all the... Eye Anatomy Optic Nerve Sep 28, 2025
The Facial Nerve, Your Eyelids and Your Tear Supply Closing your eyes is such an ordinary act that it is hard to imagine losing it. Yet lid closure is muscle work, and that muscle takes its orders from one nerve on each side of the face. When that nerv... Eye Anatomy Eyelids Tear Film Sep 19, 2025
The Punctum: The Tiny Opening That Drains Your Tears Stand at a mirror and pull your lower lid down slightly at the inner corner, near your nose. That faint pinprick opening on the lid margin is a punctum, and you have four of them, one on each lid. The... Eye Anatomy Eyelids Tear Film Sep 17, 2025
Inside the Pupil: What Makes It Open and Close The black circle at the center of your eye is not a part. It is a gap. The pupil is simply the opening left in the middle of the iris, and it looks black because almost no light that goes in comes bac... Eye Anatomy Optic Nerve Pupil and Iris Sep 14, 2025
The Retina: How the Back of Your Eye Turns Light Into Sight Your eyes gather light all day, but you do not actually see anything until that light reaches the back wall of the eyeball. The retina is that wall. It is a thin sheet of nerve tissue lining the insid... Eye Anatomy Optic Nerve Retina Sep 13, 2025
Rods and Cones: The Cells That Turn Light Into Sight Everything you have ever seen started as a chemical reaction in a cell smaller than a speck of dust. The retina lining the back of your eye holds roughly 125 million of these light-sensitive cells, an... Eye Anatomy Optic Nerve Retina Sep 12, 2025
The Sclera: What the White of Your Eye Is Made Of The white part of your eye has a name, and it does more work than its plain appearance suggests. The sclera is the tough outer shell of the eyeball, and it wraps around roughly five-sixths of the glob... Cornea Eye Anatomy Optic Nerve Sep 10, 2025