From Dr. Mercola:
Nearsightedness, or myopia, is a condition of the eyes making it difficult to see distant objects. With myopia you are able to see objects up close easier, such as books and your cell phone. The distance at which the objects begin to become blurry can change over time.
The number of people suffering from nearsightedness has grown significantly in the past years. In the early 1970s, the number of people affected was approximately 25 percent of those living in the U.S. In just 30 short years, that percentage jumped to 42 percent.1
Now, a meta-analysis of 145 studies involving over 2 million participants predicts that nearly half of the world will be wearing glasses by the year 2050.2 The purpose of the study was to evaluate the increasing prevalence of myopia and high myopia throughout the world.
Researchers concluded that almost 1 billion people will suffer from ocular complications or vision loss from high myopia.
Nearly 10 percent of people or 938 million people will suffer from high myopia, where their nearsighted condition puts them at greater risk for glaucoma, retinal detachment, cataracts and macular degeneration.3
How Your Eye Functions
What you see is not interpreted in your eyes but rather in your brain. Light passes through the front of your eye (cornea) and the lens, and these structures help focus the light on the retina at the back of your eye.
The cells in the retina then convert the light to electrochemical impulses making their way over the optic nerve and into your brain. The front of your eye acts like a camera lens, letting more light in at night and less during the day. This is why your pupils are larger at night, to let in more light and allow you to see.4
Glasses are used to change the focus of light on your retina and improve your vision. However, while the intention is good, the ultimate results may not be as good.
During the day, your vision fluctuates. Glasses are not able to accommodate these natural changes in your vision, and therefore the static focus of the lens in your glasses can negatively affect the way your eye functions.
Imagine your glasses are like an ankle brace. In the short term, an ankle brace can help your body to heal from a sprained ankle, offering stability and protection to the joint.
However, worn over a long period of time, the muscles in the ankle become weak from disuse and you are more prone to another ankle sprain.
In the short term, glasses will help you to see more clearly. However, over a long period of time, your eye muscle strength may change, making your unaided vision worse.
Increasing Problems With Vision Possibly Triggered by a Variety of Factors
Your vision is not affected by just one factor in your environment. This video explains some of those factors. For many years, the science community laid the blame for nearsightedness