13. Babies can see clearly for about 15 inches.
That distance happens to be just about the right distance to see their mom’s face while breastfeeding.
14. Your tears have different compositions which change based on if something is irritating your eye, or you’re crying, or yawning.
The human eye really is an amazing piece of natural machinery.
15. Your eye makes constant jerking movements called “microsaccades” which stop objects from fading from your vision.
A process called Troxler’s phenomenon causes static objects in your gaze to disappear if you stare at them for too long (see image below). Microsaccades stop this from happening.
16. The human eye can tell the difference between 50,000 shades of grey.
That’s a lot of grey.
