All curious readers of this article and fans of Zebriana™ who don’t even have science background have a right to know that how does a human eye function. We don’t believe in the use of technical jargon that is not so easy to understand and will try to use minimal scientific words.
A very simple explanation:-
When someone says that he saw a cat in the kitchen, it is actually the light (sunlight or artificial light) that falls on the cat and reflects into his eyes. That light passes through his natural eye lens and reaches the back portion of the eyes. From that back portion, the same image is transferred to Mr. Brain through millions of micro nerves. Finally, Mr. Brain uses its high-level intelligence and decodes the information provided by the micro nerves that it is a cat. This is how one sees and understands the objects around him/ her. Now you must have also understood that why can’t you see the objects at night in the absence of light. Read the points below if you are even more curious to know how exactly this all works.
Now that you know the basics so let’s take a step forward and understand how this all actually happens and various subparts of the human eye that play a crucial role in this phenomenon.
The technical aim of eye functioning
You would say that of course, the aim of the eye is to see clearly. True but technically the aim of the whole procedure is to focus the light rays on the correct point inside the eyes called Retina. If the light does not fall on that point, you experience problems like blurred vision etc.
It all starts from the cornea
This is the outermost thin layer of the eye. This non-colored layer not only protects the eyes against dust and other foreign particles but is also greatly responsible to focus the light on the right point inside the eye. People who experience astigmatism usually have issues with the shape of their cornea. It also blocks some amount of UV light.
Pupil – the black dot in the center of the eye
Pupil is a small hole in the center of the eye that contracts and retracts depending on the amount of light in the surrounding. It decides how much light should enter into the eyes for better vision. Pupil does this all with the help of its partner called “Iris”.
Iris – the partner of the pupil
This is a colored membrane just behind the Cornea and around the pupil. It helps together the pupil to contract and retract to regulate the amount of light that gets into the eyes. It opens up pupil when the light in the surrounding is less and shrinks when the light is high. The function of iris is not voluntary and is auto-controlled by the brain only. The color of iris decides the color of your eyes.
Lens – not created by any human
If you already wear corrective eyeglasses then you must have noticed that ophthalmologist recommends thinner from the middle for distant vision and for near vision thicker lenses are prescribed.
Did you know that God has placed natural lenses that becomes thin when you look at a distant object and thicker for near vision. No lens type in the entire ophthalmic industry has such smart natural technology. The main function of natural lens is to focus the light on the retina.
Retina – The receptor of light
Retina works as a captain to all subparts of your eyes. Like we discussed above that the technical aim of eye functionality is to focus the right amount of light on the retina. After the light reaches the retina, it is converted into electrical signals and those electrical signals are instantly transmitted to the brain through the optic nerve to understand what exactly is there in front of eyes. As per a recent study researchers have concluded that blue light that is emitted from screens reaches the back of eyes i.e Retina.