10. Everyone needs reading glasses as they get older
This is assuming that you already have perfect distance vision. If you are currently reading this article and are under 40 years of age with perfect distance vision, I can say with absolute certainty that you will need reading glasses at some point in the future. For about 99% of the population the age that you will first start needing reading glasses is between 43 and 50 years old. This is because the lens in your eye slowly loses its focusing ability with age. In order to focus things near to you, your lens has to change from a flat to a more spherical shape and it loses the ability to do this as you get older. As you get to around 45 years old you will start to hold things further away from you to keep them focus.
9. The lens in your eye is quicker than any camera lens
Just behind the pupil sits the eyes natural lens, whose function is to focus on the object you are looking at. Just take a minute to glance around the room and think about how many different distances you are focusing at. Every time you do this, the lens in your eye is instantly changing focus without you even being aware of it! Compare that with a camera lens which takes a few seconds to focus between one distance and another. Just be thankful that the lens in your eye is as quick as it is, otherwise things would be continually going in and out of focus.
8. Your eyes are fully developed by the age of 7 years old
By the age of 7 years old our eyes are fully developed and are physiologically the same as adult's eyes. It is for this reason that it is vitally important to pick up a lazy eye before we reach this age. The earlier a lazy eye is diagnosed, the greater the chance it will respond to treatment, as the eyes are still developing and capable of an improvement in vision. Beyond 7 years old no amount of treatment will result in any improvement in vision.
7. You blink approximately 15,000 times each day
Blinking is a semi- involuntary function meaning we do it automatically, but can also choose to blink if we so require. Blinking is an extremely important function of your eyes as it helps remove any debris on the surface of your eye, by spreading fresh tears over them. These tears help to nourish your eyes with oxygen and also have important anti bacterial properties. You can think of the function of blinking as being similar to the action of the windscreen wipers on your car, cleaning and removing everything to keep you seeing clearly.
6. Everyone gets cataracts as they get older
5. Diabetes is often first detected during an eye test
4. You see with your brain and not your eyes
3. Your eyes can adapt to blind spots in your vision
2. 20:20 vision is not the best vision you can have
1. Your eyes water when they are dry
I know this might sound crazy but this is one of strange facts about your eyes. Your tears are made up of 3 different components and they are water, mucus and fat. If these 3 components are not in exactly the right quantities, your eyes can become dry as a consequence. Your brain responds to this dryness by producing extra water and hence your eyes water.