This blog post by CRB Tech Reviews discuss about some funny eye facts for kids. Know how eyes evolved millions of years ago, helping animals to sense light and have a greater awareness of their surroundings.
Though we can function without sight, we rely heavily on vision to live our everyday lives. Here we enlist some interesting facts about the human eye and how they differ from that of other animals.
Eyes detect light and help us to see.
The information received by eyes, is sent to the brain along the optic nerve. This information is then processed there and helps us see as the object appears.
About 95% of animals have eyes. Some are very simple, just see light and dark conditions while others are more complex, allowing the recognition of shapes, colour and depth.
Like humans, some animals have eyes placed close together that helps improved depth perception, others have eyes spread further apart to allow for a greater field of view and a prior warning against potential predators.
The light sensitive tissue lining the inner surface of your eye is known as the retina, acting in a similar way to film in a traditional camera.
Cone cells in the retina detect colour whereas rod cells detect low light contrasts.
The part of the eye that helps us focus on different things in known as the lens, it changes shapes so we can focus on objects at various distances.
The cornea is the transparent covering of the iris and pupil; and along with the lens it refracts light such that it gets projected onto the retina.
The central opening of your eye is known as the pupil, it changes size based on the amount of light.
The colour area around the pupil is called the iris, it controls the size of the pupil and can have colour brown, blue, green or other colours and shades and vary person to person.
Scientists believe that animal eyes evolved about 500 million years ago, which began in simple form but with a distinct advantage. This advantage led to eyes evolving quickly amongst animals as those without the ability to see struggled to survive against those that could.
Throughout the animal kingdom there are many different types of eyes, for instance the human eye is very different to the compound eye of a fly which is better at detecting fast movements.
Human eyes have a small blind spot where the optic nerve passes through the retina.
Glasses and contact lenses are worn to correct common eye sight conditions like short and long sightedness.
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