Human eye anatomy at a glance
The eye focuses light onto the retina, where light-sensitive cells convert it into electrical signals. The optic nerve carries those signals to the brain, which interprets them as the images we see. This interactive 3D model, built from the Human Reference Atlas eye model, lets you rotate, section and isolate the structures involved.
What you can explore
- Cornea
- The transparent dome at the front of the eye protects it and bends incoming light. The cornea provides much of the eye’s focusing power.
- Iris
- The colored ring of muscle adjusts the pupil’s size to regulate how much light enters the eye.
- Pupil
- The pupil is the opening in the center of the iris, not a solid tissue. Its size changes as the iris muscles respond to light.
- Lens
- The transparent lens changes shape to fine-tune focus on the retina. The ciliary muscle helps the lens adjust for near and distant objects.
- Retina
- The retina lines the back of the eye. Its photoreceptors—rods and cones—convert light into signals that travel through retinal nerve cells.
- Optic Nerve
- The optic nerve carries visual signals from the retina to the brain. Where it leaves the eye there are no photoreceptors, creating a natural blind spot.
- Sclera
- The white, fibrous outer coat protects the eye and helps maintain its shape. Eye muscles attach to the sclera to move the eyeball.
- Ciliary Body
- The ciliary body contains the muscle that changes lens shape for focusing and tissue that produces aqueous humor, the fluid in the front of the eye.
- Vitreous Humor
- This transparent gel fills the large space between the lens and retina. It allows light to pass through and helps support the eye’s shape.
Good to know
- Where the optic nerve leaves the retina there are no photoreceptors, which creates a natural blind spot.
- Rods help with vision in dim light, while cones support color vision and fine detail.
- The pupil is an opening rather than a tissue. It looks dark because light that enters the eye is largely absorbed inside.
Sources: National Eye Institute: How the eyes work (opens in a new tab) · 3D model attribution (Human Reference Atlas, CC BY 4.0)
Educational anatomy, not medical advice.
