What Causes Myopia? A Quick Guide to Understanding Nearsightedness
myopia causes, what causes myopia, myopia in children, eye health tips, prevent myopia
What leads to myopia, also known as nearsightedness? Today, let’s explore some essential knowledge about its causes.
What Causes Myopia? A Quick Guide to Understanding Nearsightedness
What leads to myopia, also known as nearsightedness? Today, let’s explore some essential knowledge about its causes.
Internal Factors Behind Myopia
There are two primary internal causes of myopia: genetics and eye development.
1. Genetics
About 40% of myopia cases are linked to heredity—particularly high myopia (greater than -6.00 diopters). High myopia can be either physiological or pathological. If a parent has pathological high myopia, their child is more likely to develop it as well:
· If one parent has high myopia and the other has normal vision, the child has a 10%–15% chance of developing myopia.
· If one parent has high myopia and the other carries the myopia gene (with normal vision), the risk rises to 50%.
· If both parents carry the gene but have normal vision, the child has a 25% chance of developing high myopia.
However, it’s important to note that not all cases of myopia are inherited.
2. Eye Development
Babies are typically farsighted at birth due to their small eyeballs. As the child grows, the eyeball lengthens, and by around age 6, the eyes typically reach normal development. If the eye grows too long during this phase, it results in myopia. This natural development is largely uncontrollable.
External (Lifestyle) Factors
More common and modifiable than internal causes are external or environmental factors, including:
1. Short Working Distance
Many young people today read or use screens at very close distances—sometimes less than 10 cm. While young eyes can still focus clearly at this distance, prolonged close-up work can lead to eye strain and eventually myopia.
2. Prolonged Eye Usage
Whether it's due to homework, screen time, or work demands, both youth and adults are spending excessive time focusing on near tasks. Without sufficient breaks, the eyes don’t get the rest and relaxation they need, increasing the risk of vision problems.
3. Poor Visual Environment
Watching screens in moving vehicles, on the street, or under poor lighting puts additional stress on the eyes. Constant movement and unstable lighting conditions make it difficult for the eyes to focus properly, accelerating the onset of myopia.
How to Prevent Myopia
To protect your eyesight—especially for children and teenagers—prevention is key. Here are some simple steps:
· Correct poor visual habits, such as reading too closely or using screens in dark environments.
· Create a healthy eye environment with stable lighting and reduced screen time.
· Increase outdoor activities, which help relax the eyes and reduce the risk of developing myopia.
· Schedule regular eye exams to monitor changes in vision and take early action when needed.
By understanding both the internal and external causes of myopia, we can take better steps to protect our eyes and those of our children.
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This article was written by the buyglasses.com team. Buy glasses at factory prices on buyglasses.com.