How do you know you’re seeing what you think you’re seeing? How do eyes work?
Take a break from whatever you were doing (you’re procrastinating, aren’t you?) and take a look around you. What do you see? What do you think you see with? What’s the process behind it? We’re here to answer that question and then some.
Usually, the entire premise that we use our eyes and eyes alone to see is wrong. Your eyes aren’t the ones doing all that seeing business – it’s mostly your brain. Whenever you’re looking at something, it’s your brain that’s recognizing those objects after receiving feedback from your eyes.
Think about the eyes as a medium. They’re the Mars Rover in this equation, and the brain is NASA HQ. We need our eyes to perceive our surroundings and collect information that is then processed in the brain.
Let’s start with the simple part of the process. Understanding sight (and the other senses, for that matter) comes down to knowing the anatomy of the organ that does most of the busy work. In this case, the eye.
The Anatomy of the Eye Explained
The eyeball itself is a sphere measuring about 24 mm in diameter. The eye is suspended in the bony socket by a series of muscle which
The layers of the eye
Cut down to its basics, the eye is made out of three layers, namely tunica
The optical components of the eye
With that said and done, it’s time to move on to the optical components of the eye. They admit, bend, and focus light onto the cells of the retina to form an image. They are the following:
- Cornea. The major refractive element of the eye.
- The aqueous humor (scroll above)
- The lens. Its elastic structure makes focusing on near objects possible.
- Vitreous body. It secretes a fluid that protects the eye from motion-related damages.
The Mechanism of Sight
Now that we’re done with the structural part of the eye, it’s time to explain the process behind
The images we see are actually mere reflections of the objects that we look at. Light enters the eye via the cornea, which acts as a sort of makeshift window at the front of the eye. Due to the fact that the eye is curved, the light is bent, resulting in an
How Does Color Vision Work?
Surprisingly, the eye is capable of detecting only three different wavelengths of light, which correspond with three colors – red, blue and green. It’s the millions of combinations between these three colors that create the different shades that we take for granted.
Each of our eyes
Myths About Eyesight
Here’s the thing: nobody is exempt from taking facts for granted without researching them properly as long as they sound cool or unique. However, that doesn’t make them less… well, untrue. Similar to psychology, bodybuilding, and health, there are many myths that have become so ingrained in the public consciousness that most people take them for granted. Here’s a rundown of the most common myths about eyesight:
1. Reading in dim light doesn’t damage your sight, but it will cause fatigue. So your mom nagging you about reading under the blanket after bedtime was probably due to you
3. Despite what your mom says, sitting too close to the TV will not hurt your eyes – but it does cause eye strain and headaches. Same goes for computers, as using one can cause eye fatigue, but not astigmatism, farsightedness or nearsightedness.
4. Contrary to popular belief, eye exercises won’t prevent or fix vision problems. Eyesight issues are caused by other factors such as the shape of the eyeball and the health of the tissue.
5. Poor eyesight and vision loss is not genetic. While genetics play a small role, there’s no guarantee that you won’t get glaucoma or cataracts thanks to your family medical history.
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