Brown Eyes: What Melanin in the Iris Does and Doesn't Say Brown is the most common eye color in the world by a wide margin. It is so ordinary that most people with brown eyes have never given the color a second thought, beyond noticing that theirs look almos... Eye Anatomy Eye Color Pupil and Iris Jun 27, 2026
Why Blue Eyes Look Blue When There Is No Blue Pigment If you have blue eyes, someone has probably told you they came from one particular parent, or that they run in the family. The real story is stranger than that, and it starts with a fact most people f... Eye Anatomy Eye Color Pupil and Iris Jun 11, 2026
Amber Eyes: What Makes Them Gold, and How Rare They Are Some eyes look lit from the inside. In certain light they read as gold, copper, or warm honey, with no green flecks and none of the shifting patchwork you see in hazel. People often call them amber. A... Eye Anatomy Eye Color Pupil and Iris Jun 9, 2026
Aqueous Humor: The Fluid Behind Your Eye Pressure If someone has told you your eye pressure is a little high, or that you need to be watched for glaucoma, there is one fluid at the center of that conversation. It is called aqueous humor. It is not te... Cornea Eye Anatomy Optic Nerve Jun 8, 2026
The Blind Spot in Every Eye, and the One to Worry About Right now, in the middle of everything you can see, each of your eyes has a hole in its vision. It sits off to the side of where you are looking, it is bigger than most people expect, and you have alm... Eye Anatomy Optic Nerve Retina May 3, 2026
The Cavernous Sinus: A Crowded Space Behind Your Eye Tucked just behind and slightly below each eye is a space most people never hear about until something goes wrong in it. It is called the cavernous sinus, and there are two of them, one on each side o... Eye Anatomy Eyelids Pupil and Iris May 2, 2026
Inside the Eye: The Three Chambers and What They Do An eye is often described as a camera, which makes it sound solid and mechanical. It is closer to a soft, fluid-filled ball that holds its shape because of what is inside it rather than because of any... Eye Anatomy Pupil and Iris Retina Apr 24, 2026
The Choroid: The Blood Supply Behind Your Retina Most people learn a few parts of the eye and stop there. The cornea in front, the lens behind it, the retina lining the back. The choroid rarely makes that list, even though the retina could not do it... Eye Anatomy Optic Nerve Retina Apr 23, 2026
The Conjunctiva: The Clear Layer Behind a Red Eye If you have ever stared at a red eye in the mirror and wondered what, exactly, turned red, the answer is a tissue most people have never heard of. It is called the conjunctiva. It is clear, thin and s... Eye Anatomy Eyelids Tear Film Apr 8, 2026
The Ciliary Body: Focus, Fluid and Eye Pressure Most parts of the eye you can name are ones you can see. The ciliary body is not one of them. It sits just out of view behind the colored ring of your iris, and you will never spot it in a mirror. It ... Eye Anatomy Optic Nerve Pupil and Iris Mar 23, 2026
The Cornea: The Clear Front Surface of Your Eye Put a finger lightly on your closed eyelid and press for a second. The firm dome you feel underneath, right over the colored part of your eye, is the cornea. It is about the size of a dime and thinner... Cornea Eye Anatomy Tear Film Mar 15, 2026
Depth Perception: How Your Eyes Judge Distance Depth perception is the part of vision you never think about until it slips. Pouring coffee, reaching for a door handle, judging whether a gap in traffic is big enough, catching keys tossed across the... Eye Anatomy Optic Nerve Retina Mar 8, 2026