What are uniqueness of human eye? Let's read this article carefully.
1. Everyone Needs Glasses At Old Age
If you are reading this article and are under 40 with perfect visibility, I can say with absolute certainty that you will need reading glasses in these times. certain future. About 99% of the world's population, the age you will first start needing reading glasses is between 43 and 50 years.
This is because the lenses of your eyes gradually lose their ability to focus as you age. In order to focus on near objects your eye lens has changed from a flat shape to a more round shape so it will lose the ability to do this as you get older.
2. The Eye Lens Moves Faster Than Any Camera Lens
Behind the pupil of the eye there is a natural lens that functions to focus your gaze on the object you are looking at. Take a minute to look around the room and think about how many different distances you are focusing on.
Every time you do this, the lens in your eye immediately changes focus without you even noticing! Compare that to a camera lens that takes a few seconds for different distances and focus between each other.
3. Eyes Will Be Completely Developed At the Age of 7 Years
At the age of 7 years our eyes have fully developed and are physiologically similar to adult eyes. This can be used as an important reason to cure "lazy eye" (= is a condition where visual acuity cannot be optimal without organic disorders) before we reach this age.
The earlier "lazy eye" is diagnosed, the greater the chance of a cure, because the eye is still developing and can change in vision. After the age of 7 years there is no treatment that can change eye vision.
4. Eyes Blink About 15,000 Times Every Day
Blinking is a semi-intentional function of the eye, this means that blinking is not only done automatically, but people can also be forced to blink when needed. The eye blinks approximately 15,000 times per day.
Blinking is a very important function of your eye as it helps remove dirt on the surface of your eye, by spreading fresh tears over it. These tears help to nourish your eyes with oxygen and also have antibacterial properties. You can assume the blinking function is similar to the wiper function on your car, cleaning and wiping everything to let you see clearly.
5. Everyone Will Get Cataracts When They Get Old
People do not realize that cataracts are a normal consequence of reaching old age and everyone will experience it at some point in their old age. You can think of cataracts as the same as hair turning white with age which is a natural change with age.
The average age when people first get cataracts is around 70 and 80, you are guaranteed to have cataracts! This is the same as you cannot find an 80 year old person without white hair, nor will you find an 80 year old person without cataracts.
6. Diabetes Is Often Detected For The First Time With An Eye Test
People who have type 2 diabetes (the type that will develop later in life) are often symptom-free, which means they often don't know they have diabetes. This type of diabetes can usually be detected with an eye test, as it can be seen as small bleeding from leaking blood vessels behind your eye. This is certainly a good reason to have regular eye tests.
7. People See Using the Brain, Not the Eyes
The function of your eyes is to gather all the necessary information about the object you want to see. This information will then be passed from your eyes to the brain via the optic nerve. It is the brain (visual cortex) where all this information is analyzed to allow you to 'see' things in their finished form. This is not to say that your eyes don't play an important role because of course they do.
8. Your Eyes Can Adapt To Your Blind Spots
Certain eye conditions, such as glaucoma and certain health conditions, such as having a stroke, can develop blind spots in your vision. This could be very debilitating if it weren't for your brain and ability to adapt to make this blindspot disappear. This is done by pressing the blind spot in the affected eye and allowing the other healthy eye to "fill in the blank" created by the affected eye.
9. 20:20 Vision Is Not The Best Vision You Can Have
When people hear the phrase 20:20 vision* they assume that it is the best measure of vision. However it is not true that 20:20 vision refers to what the average adult can see.
If you imagine a typical eye test chart, 20:20 vision is probably just the second line from the bottom. This bottom line is even lower than 20:20 vision and this means you may have 20:16 vision. So don't be too impressed when someone tells you they have 20:20 vision!
* What is meant by 20:20 vision is: the number 20 in front shows your distance from the object you are looking at, which is 20 feet or 6 meters. While the number 20 behind states that the object can still be seen clearly by normal vision from a distance of 20 meters. And this 20:20 vision is considered the best measure of sight. But the reality is different.
10. Eyes Will Water When They're Dry
It may sound crazy, but this is one of the strangest facts about your eyes. Your tears are made up of 3 different components namely water, mucus and fat. If these three components are not exactly in the right amount, then your eyes can become dry. Your brain responds to the dryness by producing extra water.