Childhood myopia: why might the prescription increase?

08 October 2026

Myopia is one of the most common vision problems during childhood and adolescence. In many children, the prescription may increase over the years, making it necessary to change their glasses periodically.

What is myopia?

Myopia occurs when the eye has a shape or length that causes light to focus in front of the retina instead of directly on it. As a result, nearby objects may appear clear, while distant objects appear blurry.

During childhood, the eyes are still growing. In some children, the eye may become longer than expected, causing myopia to increase.

Why can the prescription increase?

Myopia progression can be related to different factors:

• Genetics: children with myopic parents are more likely to develop myopia.
• Age of onset: when myopia develops at an early age, there is a greater possibility that it will progress during childhood and adolescence.
• Near-work activities: spending many hours reading, studying, or using electronic devices may be associated with greater myopia progression, especially when combined with limited time outdoors.
• Limited time outdoors: spending more time participating in outdoor activities has been associated with a lower risk of developing myopia.

What can parents do?

Although not all cases can be prevented, certain habits can support good eye health:

• Encourage outdoor time every day.
• Avoid prolonged periods of near work without taking breaks.
• Maintain an appropriate distance when reading or using devices.
• Use good lighting while studying.
• Schedule regular eye examinations.

Additionally, if a child already has myopia, it is important to monitor their prescription regularly to determine whether it is progressing.

An increasing prescription deserves follow-up

When a child needs a stronger prescription, it does not simply mean that they “need new glasses.” It may be a sign that their myopia is progressing.

That is why regular ophthalmological follow-up is essential, especially when myopia develops at an early age or increases rapidly.

If your child squints to see things in the distance, sits too close to books or devices, has difficulty seeing the board, or frequently experiences headaches, an eye examination is recommended.

Detecting and managing myopia early can help protect children’s vision throughout their growing years.