Vision and the human eye are some of the most amazing designs in all of creation!
- The adult human eye is just slightly smaller than a ping-pong ball.
- Human eyes start to develop 2 weeks after conception
- After the brain, the eye is the most complex organ of the body.
- The number one cause of blindness in the U.S. is diabetes.
- The cornea is the only living tissue in the human body that doesn’t contain blood vessels. The eye is an open window!
- The average lifespan of an eyelash is 5 months.
- To see, more than 2 million parts of the eye have to work together!
- Each human eye does have a blind spot where the optic nerve leaves the eye. By design, those blind spots don’t match up between the two eyes so we don’t ever have a blind spot in our binocular vision.
- The eyeball weighs approximately 1 ounce.
- The most active muscles in the body are our eye muscles.
- Under perfect conditions, the human eye can discern the light of a candle at a distance of 14 miles.
- In the next 20 years, twice as many people will be blind as there are today.
- Rods and cones of the retina change chemically based upon the light that hits them. Based on that change, a nerve impulse is sent to the brain. The brain then composes the impulses into light, shadow, form, and color to create an amazing 3-D image!
- We can detect hypertension, high cholesterol, and diabetes by studying the blood vessels in the back of the eye.
- 20/20 vision means the eye sees normally at 20 feet; 20/15 is better…the eye can see at 20 feet what another eye sees at 15 feet.
- Eye color is determined by the amount of melanin in the outermost part of the iris; blue collagen is underneath. A higher concentration of melanin will give one brown eyes; a lower amount will give one green or even blue eyes.



