Author: Dr Val Phua
Estimated reading time: 9–10 minutes
Glasses Can Now Do More Than Correct Vision
Traditionally, spectacles simply corrected blurred vision caused by myopia (short-sightedness). As a child’s prescription increased, stronger lenses were prescribed—but the glasses themselves did not slow the progression of myopia.
Today, specialised myopia control spectacle lenses, also known as defocus spectacle lenses, have changed the way childhood myopia is managed.
These innovative lenses not only provide clear vision but also help slow the progression of myopia by reducing the stimulus for excessive eye growth.
What Are Defocus Spectacle Lenses?
Defocus spectacle lenses are specially designed glasses that correct your child’s vision while simultaneously altering the way light focuses on the peripheral retina.
Unlike conventional single-vision spectacles, these lenses provide:
- Clear central vision for everyday activities.
- Peripheral optical defocus designed to reduce excessive eye growth.
The aim is to slow the progression of myopia while allowing children to continue wearing spectacles as normal.
How Do They Work?
Researchers believe that the peripheral retina plays an important role in regulating eye growth.
With conventional spectacles, central vision is corrected but the peripheral retina may still receive signals that encourage the eye to continue elongating.
Defocus spectacle lenses create a pattern of peripheral myopic defocus, which helps reduce these growth signals.
By slowing eye elongation, these lenses can reduce the rate at which myopia progresses.
Different Types of Defocus Lens Technology
Several optical designs have been developed, including:
- DIMS (Defocus Incorporated Multiple Segments) technology
- Highly Aspherical Lenslet (HAL) technology
- Other peripheral defocus designs
Although the optical designs differ, they all share the same objective—slowing childhood myopia progression while maintaining clear vision.
Who Is Suitable?
Defocus spectacle lenses may be recommended for children who:
- Have progressing myopia
- Prefer wearing glasses rather than contact lenses
- Are not suitable for Orthokeratology
- Are too young for contact lenses
- Require a simple, non-invasive treatment option
A comprehensive eye examination is required before treatment.
How Effective Are They?
Clinical studies have shown that modern myopia control spectacle lenses can significantly reduce the progression of myopia and slow axial eye growth in many children.
As with all myopia treatments, the degree of benefit varies between individuals.
The objective is to slow progression, not eliminate it entirely.
Advantages
Defocus spectacle lenses offer several benefits:
- Non-invasive
- Comfortable to wear
- Easy for younger children
- No contact lens handling
- No daily eye drops
- Suitable for full-time wear
- Supported by growing scientific evidence
For many families, they provide an excellent first-line treatment option.
Possible Limitations
These lenses are not suitable for every child.
Considerations include:
- Higher cost than standard spectacles
- Need to wear them consistently
- Myopia may still progress, although usually more slowly
- Regular follow-up remains important
Children generally adapt quickly to the lenses.
Can They Be Combined with Other Treatments?
Yes.
Some children with rapidly progressing myopia may benefit from combination therapy, such as:
- Defocus spectacle lenses plus low-dose atropine
- Increased outdoor time
- Healthy visual habits
- Reduced prolonged near work
Treatment should always be individualised.
Looking After the Glasses
Children should be encouraged to:
- Wear the glasses consistently during waking hours.
- Clean the lenses regularly.
- Store them safely when not in use.
- Attend regular eye examinations to monitor progression.
Replacing scratched or damaged lenses helps maintain the intended optical performance.
Frequently Asked Questions
Are these better than normal glasses?
For children with progressing myopia, yes. Unlike conventional spectacles, defocus spectacle lenses are designed to both correct vision and help slow myopia progression.
Will my child still need stronger glasses?
Possibly.
The lenses slow progression but do not stop myopia completely.
Are they suitable for younger children?
Yes.
Many younger children adapt very well, making them an excellent option for families who prefer not to use contact lenses or eye drops.
Can these lenses cure myopia?
No.
They slow the progression of myopia but do not reverse existing short-sightedness.
The Bottom Line
Defocus spectacle lenses represent one of the most important advances in childhood myopia management. By combining clear vision with evidence-based myopia control, they offer a safe, non-invasive treatment option for many children.
When combined with increased outdoor time, healthy visual habits and regular eye examinations, these lenses can help reduce the progression of myopia and lower the long-term risk of vision-threatening eye disease.
References
- International Myopia Institute. IMI Clinical Management Guidelines.
- World Society of Paediatric Ophthalmology and Strabismus. Consensus Statement on Myopia Management.
- American Academy of Ophthalmology. Childhood Myopia Management.
- Lam CSY, et al. Defocus Incorporated Multiple Segments (DIMS) Spectacle Lenses and Myopia Progression.
- Bao J, et al. Highly Aspherical Lenslet (HAL) Spectacle Lenses for Myopia Control.
