Will a lower glasses prescription slow down the progression of myopia?

You may have heard this before: don’t get the full prescription for glasses—go a little lower, so your eyes won’t get as tired, and it might even slow down the progression of myopia.

Many parents even ask for a slightly lower prescription when taking their children for glasses, thinking it will protect their eyes.

But the truth is just the opposite. A lower prescription doesn’t protect a child’s eyes—it may actually speed up the progression of myopia.

Is a lower prescription really a good idea?

Myopia happens because the eye’s axial length increases—the distance from the front to the back of the eye gets longer, causing light to focus in front of the retina. The role of glasses is to “push” the focus back onto the retina. The more accurate the prescription, the more precisely the light lands.

If you intentionally give a child a lower prescription, light still focuses in front of the retina, and the image remains blurry. To try to see clearly, the ciliary muscles in the eye contract continuously and over-accommodate, leading to ciliary muscle spasm over time. This causes eye strain, soreness, and fatigue—and eye strain is a key factor that accelerates myopia progression.

Even more critically, long-term blurred imaging sends the wrong signal to the growing eye, encouraging it to “keep growing,” stimulating further axial elongation and causing myopia to worsen faster.

Multiple clinical studies have confirmed that under-correction of myopia accelerates the progression of nearsightedness in children and adolescents【1】.

Is getting the full prescription enough?

So if you give a child the full prescription, will myopia stop progressing? Unfortunately, no.

Regular glasses do help children see clearly at a distance, but they do very little to slow the progression of myopia. That’s because the retina has not only a central area but also a large peripheral region. With standard lenses, central light lands exactly on the retina, but peripheral light ends up behind the retina.

This “peripheral hyperopic defocus” signal can still encourage the eye to continue elongating.

So is there a type of lens that not only helps children see clearly but also actively “holds back” the eye’s growth and controls its rate of progression? Yes—it’s called a defocus-incorporated multiple segment (DIMS) lens. The clever design of these lenses includes two zones:

• Central zone: Corrects myopia normally, ensuring clear vision.

• Peripheral zone: Uses micro-lenses or special curvature to focus peripheral light in front of the retina, creating “peripheral myopic defocus”—sending the eye a signal that says “no need to grow further.” This inhibits excessive axial elongation and slows myopia progression.

It’s important to note that although DIMS spectacles are not classified as medical devices, their fitting and prescription require professional expertise. Improper fitting can reduce the myopia control effect or even worsen binocular vision dysfunction. Always have a comprehensive eye exam and fitting done by a professional at a specialized eye care institution.

Three key principles for scientific lens prescription

Whether you choose standard or DIMS lenses, these three principles apply:

1. Full correction: Get a cycloplegic refraction (dilated eye exam) at a professional eye care institution, and prescribe the full measured prescription. Don’t deliberately lower it.

2. Consistent wear: Children and adolescents with myopia should wear their glasses all day. With DIMS lenses, sufficient daily wearing time is essential for effectiveness.

3. Regular follow-ups: For children and teens, the eyes are still developing and myopia can progress quickly. Schedule checkups every 3–6 months to monitor vision and axial length, and adjust the myopia management plan as needed.

In closing

There are no shortcuts to controlling myopia. “Lowering the prescription” is a trap for the eyes. Under-correction only makes the axial length grow faster, speeding up myopia progression. Don’t let these misconceptions harm your child’s vision. Choose the right lenses and wear them scientifically—that’s how you can slow down your child’s myopia progression, step by step