Human eye — cross-section
How vision works: light enters through the cornea and pupil, the lens focuses it onto the retina, and the optic nerve sends signals to the brain.
A fun, visual guide to eye anatomy, eyelash structure, healthy habits and screen comfort.
Click any term below each diagram to read its function
How vision works: light enters through the cornea and pupil, the lens focuses it onto the retina, and the optic nerve sends signals to the brain.
Why lashes matter: they help catch small particles and trigger blinking. Follicles produce each lash; nearby eyelid oil glands contribute to tear-film stability.
Every 20 minutes, look at something about 20 feet away for 20 seconds.
Try 10 slow, complete blinks when your eyes feel tired or dry.
Keep a consistent sleep routine and aim for enough sleep for your age.
| Food examples | Nutrients | Role in the body |
|---|---|---|
| Carrots, pumpkin and spinach | Beta-carotene / vitamin A | Vitamin A is essential for normal vision. |
| Salmon, sardines and walnuts | Omega-3 fats | Part of a balanced diet; evidence for treating dry eye varies. |
| Eggs, nuts and seeds | Vitamin E, zinc and other nutrients | Support normal cell function and general health. |
| Oranges, berries and peppers | Vitamin C and antioxidants | Help protect cells from oxidative stress. |
| Water and varied meals | Fluids and micronutrients | Support general wellbeing; no food guarantees longer lashes. |
A balanced diet supports normal eye function but does not replace an eye examination or treat an eye condition. Avoid high-dose supplements unless advised by a healthcare professional.
Test what you learned about the 20-20-20 rule, lens, vitamin A, hygiene, and eyelashes.
Choose one answer for each question, then press Check my answers.