5. Human eyes have fastest lens known to mankind.
They are way faster than any known camera lens. While camera lenses take a few seconds to focus on objects at different distances, human eyes can adjust focus almost instantly without any noticeable lag.
6. Human eyes blink 17 times every minute on an average. This sums up to 14,280 blinks each day and 5.2 million blinks every year.
7.The human eye works just like a camera. In the same way that a camera lens focuses light onto a photosensitive surface, your eyes focus light onto the retina.
8.Eyes first evolved around 500 million years ago. Scientists estimate that eye first evolved 500 million years ago, originally in a very simple form that could probably only distinguish light from dark.