What turns leaves into green blobs, is longer than it is round and is shared by nearly half the people you know? The answer is closer than you might think.
Myopia, commonly known as nearsightedness, is the most common cause of impaired vision in people younger than 40 — and its presence is growing rapidly. Over 40% of the U.S. population is nearsighted today.1
By 2050, it’s predicted nearly half of the global population will be myopic.1,2 But why? Let’s look into some of the easy-to-read signs and possible cause of this condition.
Understanding myopia: The long game
Nearsightedness occurs when your eyes cannot clearly see objects at a distance, such as road signs or performers on a stage. If the leaves on the trees look more like steamed spinach than crisp greens, you probably have at least a slight case of myopia.
Yet there’s a lot about myopia that many people, even those who have it, don’t know. For example, are you aware that myopia is often caused when the eyeball grows too long, front to-back?
When this happens, the image ends up focusing in front of the retina (the layer of light-sensitive tissue in the back of the eyes) rather than on the retina.2 The result is that distant objects become unfocused.
Another common cause of myopia is a cornea that is too curved for the length of the eyeball. In some cases, a person may have eyeballs that are both long and curvy.2
Looking closely on childhood
Scientists aren’t sure why the eye grows too long, though it could be hereditary. As for the sharp rise in the presence of nearsightedness, several studies indicate that greater amounts of time spent reading, writing and working on computers, and spending less time outdoors, may contribute.2
If you see your kids holding a book too close or sitting very near the TV, suggest they move away or take a break.2 This may also be a good time to schedule an eye exam, to play it safe. Childhood nearsightedness often stabilizes by early adulthood, but in some cases, the condition progresses with age.2
Myopia: So far, so good
For folks who have standard myopia, the prognosis is good. It usually can be easily corrected with eyeglasses, contact lenses or refractive surgery (LASIK or laser surgery).3
That being said, because it can progress, myopia should not be ignored. If you have trouble seeing things far away, find yourself (or your kids) squinting at the distance, or if you experience eye strain and/or headaches, schedule a comprehensive eye exam.
- “Is nearsightedness more common?”, All About Vision, March 2022, https://www.allaboutvision.com/conditions/myopia-faq/is-nearsightedness-common.htm
- “Myopia”, All About Vision, March 2022, https://www.allaboutvision.com/conditions/myopia.htm.
- “Nearsightedness”, Mayo Clinic, April 2, 2020, https://www.mayoclinic.org/diseases-conditions/nearsightedness/diagnosis-treatment/drc-20375561.