Interesting facts about the Human Body

Interesting facts about the eyes

1. Any damage to the eye such as a corneal scratch will be repaired in less than 48 hours. This is because the eyes are very capable of healing at great speed.

2. My baby will not stop crying!

Well that's kind of not true; babies under the age of 4-13 weeks old are not actually capable of producing any tears, but unfortunately they are still very capable of producing a crying sound.

3. Eyes have specialised cells for interpreting specific colour distinction. There are two types' rod cells which are design to interpret black and white, and cone cells which are designed to distinguish other colours. Cone cells are mostly used in bright areas such as daytime or brightened rooms. However, cone cells are not so handy in darkened area by which we heavily rely upon our rod cells to help us see in the dark. So, for this reason your vision at night is only able to pick up black and white colours because your cone cells are not active.

4. The eye is thought to have evolved over 550 million years ago from a s ingle cell organism presented as photoreceptors, proteins that sense slight changes in light. It is from this design that the eye evolved to become more complex as multicellular species began to appear. However, some scientist theories that even photoreceptors evolved from an even simplistic design.

5. The eye is the only organism that does not grow from birth to adult hood. When you are born the eye is fully grown, it is the rest of the facial features that grow around the eye revealing more of the white matter.

6. They are certain types of protection from facial components surrounding the eye. Firstly, don't wear your eyebrows too sparingly, as the eyebrows are there to prevent mostly sweat from dripping into the eye. Secondly, the infamous eye lashes are mostly designed to prevent the eyes from being contaminated from dirt and dust, even though eyelashes themselves tend to invade the eye. Thirdly, the eye also has a third back up; these are known as lysosomes and other immune cells to eliminate any foreign bodies that do land on the surface of the eye.

7. As we know the brain is by far the most complex organ of the human anatomy but what is the second. Yes, you guessed it the eye!

The eye has evolved to be so complex, at times that many scientists like Charles Darwin

found it very hard to believe that the complex structure of the eye managed to evolve naturally.

8. If it wasn't for the Vestibulo-ocular reflex created by an inbuilt muscle, everything we see would be blurred. This little trick comes into play from when you sit d own watching television moving your head very slightly without knowing, or more importantly when you are walking and even running. The muscles are able to adjust the contraction focusing the light on the retina at all times to suit the activity, producing that clear vision.

9. Tears are formed from the lacrimal glands found in the upper eyelids; they constantly secrete a watery bases substance that keeps the eyes moist and clean. The watery substance will then move to the lower corners of the eye near the nose into a sac called the lacrimal sac. From here the watery substances will move into the nasolacrimal duct where it will drain into the nose to become reabsorbed. Knowing this does also explain why your nose becomes very watery when you are crying or facing the wind during bad weather.

10. Currently, an eye transplant will only consist of the donor of the cornea. Scientists have not yet been able to fully transplant the whole eye. This is due to various complications some being that the complexity of the brain and optic nerve, and secondly most importantly the optic nerve is too sensitive.