DIMS (MiYOSMART) vs HAL (Stellest)
Understanding DIMS and HAL Technology
DIMS stands for Defocus Incorporated Multiple Segments. The lens features a central clear zone that corrects your child's nearsightedness, surrounded by hundreds of tiny honeycomb-shaped segments. These small segments create myopic defocus in front of the retina, a signal that may slow axial elongation of the eye.
Because the eye grows longer as myopia worsens, the goal is to reduce that growth rate. The honeycomb pattern is distributed across much of the lens outside the central clear zone, providing myopia control effect during typical daily wear.
HAL stands for Highly Aspherical Lenslets. Stellest lenses use a similar principle but with a different design. The center of the lens corrects distance vision, while approximately 1,000 tiny lenslets arranged in rings around that center create areas of myopic defocus in front of the retina.
This defocus is thought to signal the eye to slow down its elongation. The lenslet pattern covers a large portion of the lens and is designed to deliver myopia control signals during everyday activities when worn consistently.
Standard single-vision glasses only correct your child's blurry distance vision. They do not reliably slow myopia progression, so your child may need stronger and stronger prescriptions as the years go by. DIMS and HAL lenses, by contrast, offer dual function.
- They provide clear central vision for schoolwork, screens, and distance viewing
- They incorporate special zones that are designed to provide optical signals that may slow axial growth
- They fit into regular frames, making them easy to wear all day
- They require no surgery, drops, or overnight lens wear
We may recommend myopia control lenses when your child shows certain patterns. Rapidly increasing prescriptions, especially at a young age, suggest the eyes are lengthening quickly. Family history also plays a role, since children with myopic parents often experience faster progression.
Other possible signs of vision problems include squinting to see the board at school, sitting very close to screens, frequent headaches after reading, and difficulty seeing street signs or sports scoreboards. If any of these sound familiar, scheduling an assessment can help you understand whether DIMS or HAL technology is worth exploring.
Who Is a Candidate for DIMS or HAL Lenses
Most children who benefit from these lenses are in the school-age years when myopia tends to progress most rapidly. While there is no strict age cutoff, starting earlier in childhood often leads to better long-term outcomes. Lens availability depends on your child's prescription including the amount of astigmatism, and our eye doctor evaluates each case individually. Suitability also depends on binocular vision status, accommodative function, and your child's ability to wear glasses full time throughout the day.
Very young children who cannot reliably wear glasses all day may not be ideal candidates yet. Teenagers whose myopia has already stabilized may see limited added benefit. We assess both the current prescription and the rate of recent changes to guide our recommendation.
Certain children face higher risk for fast myopia progression. Those with two myopic parents are more likely to develop higher levels of nearsightedness. Children who spend many hours on close-up tasks, such as reading or digital device use, also tend to progress more quickly.
- Family history of moderate to high myopia
- Limited time spent outdoors each day
- Early onset of myopia, especially before age eight
- Rapid prescription changes within a single year
Some eye health issues can influence whether DIMS or HAL lenses are appropriate, or whether we may need to modify our approach. Children with significant astigmatism can still wear these lenses, but we may need to combine the myopia control design with astigmatism correction. Those with eye muscle imbalances or binocular vision problems may benefit from additional evaluation, and treatment priorities are individualized when amblyopia or strabismus management is also needed.
Certain retinal conditions or corneal irregularities might make other myopia control options, such as orthokeratology or atropine drops, more suitable. We perform a complete eye health exam before finalizing any myopia management plan.
Not every child needs specialized myopia control lenses. If your child's prescription is very mild and has stayed stable for two or more years, the investment in DIMS or HAL technology may not be necessary. Similarly, older teenagers whose eyes have stopped growing may see little advantage over regular single-vision lenses.
Some families prefer to start with lifestyle changes, such as increased outdoor time and reduced screen hours, before adding lens-based interventions. We respect each family's timeline and help you weigh the benefits against the costs and commitment involved.
Clinical Evidence and Effectiveness
Clinical trials on MiYOSMART lenses have followed children for multiple years, measuring both myopia progression and eye length changes. On average, children wearing DIMS lenses experienced about 50 to 60 percent slower progression compared to those in standard single-vision glasses, though the exact percentage varies depending on whether refractive change or axial length is measured and the duration of follow-up. Some children showed even greater slowing, while a smaller group saw minimal difference. These outcomes depend on consistent daily wear.
Research published in peer-reviewed journals supports the safety of the lenses, with no significant increase in side effects. Because these studies are still relatively recent, long-term data beyond a few years is still being collected. We rely on the best available evidence as of 2025 when discussing expected outcomes.
Stellest lenses using HAL technology have also undergone clinical testing, with results showing similar or slightly better myopia control in some trials. Published studies report up to about 60 to 67 percent reduction in progression in some studies at some timepoints, with variation depending on the specific endpoint measured. Again, individual responses vary, and not all children benefit equally. These results are from comparison with single-vision control groups and require consistent lens wear.
The lenslet design has been tested for visual comfort and clarity, with most participants reporting good adaptation. As with DIMS, longer-term studies beyond two to three years are ongoing, so we present this as a valuable tool with promising but still-evolving evidence.
Head-to-head studies directly comparing DIMS and HAL lenses in the same population are limited as of 2025. Based on separate trials, both technologies appear to offer roughly comparable myopia slowing, often in the range of 50 to 65 percent. Small differences in study design, participant age, and baseline myopia make it difficult to declare one consistently superior.
- Both lens types use multiple segments or lenslets to create simultaneous myopic defocus that may slow eye growth
- Average reduction rates overlap significantly in published data
- Individual child factors may matter more than the specific brand
- Our eye doctor considers your child's prescription, age, and lifestyle when choosing
Most published trials track children for two to three years, which is enough to demonstrate short-term slowing but not lifelong outcomes. We do not yet know whether the benefit persists into adulthood or if there is any rebound effect once children stop wearing the lenses. Larger, longer studies will continue to refine our understanding.
Another limitation is that no myopia control method works for every child. Some will still progress despite consistent lens wear, though usually at a slower rate than they would have otherwise. We set realistic expectations and monitor progress closely to adjust the plan as needed.
Daily Use and Practical Considerations
From a normal viewing distance, both DIMS and HAL lenses look similar to standard eyeglasses. The tiny honeycomb segments or lenslets are visible only upon very close inspection, appearing as subtle patterns embedded in the lens. Your child will not look different to classmates, and the frames are chosen just like any other pair of glasses.
In certain lighting, such as direct sunlight or bright indoor lights, someone looking very closely might notice a faint halo or grid pattern on the lens surface. This does not interfere with social interactions or self-confidence for the vast majority of children.
Most children adapt to the unique optical design within a few days. The central zone provides clear vision, so reading and distance tasks feel natural right away. The peripheral defocus zones can cause slight blur or halos around bright lights at first, but the brain typically adjusts quickly.
- Start by wearing the glasses full-time during waking hours
- Expect minor visual oddities such as slight rainbows in the first week
- Encourage your child to wear them consistently so the eyes adapt faster
- Contact our office if discomfort or blur persists beyond two weeks
Because the lens surfaces have embedded patterns, smudges and fingerprints can be more noticeable than on regular glasses. We recommend cleaning the lenses daily with a microfiber cloth and lens spray designed for eyeglasses. Avoid using paper towels, clothing, or harsh chemicals, as these can scratch the special coatings.
Encourage your child to handle glasses by the frames, not the lenses, and to store them in a protective case when not in use. Regular cleaning helps maintain clear vision and comfortable full-time wear.
To achieve the myopia slowing effect seen in clinical trials, children should wear their DIMS or HAL lenses at least ten to twelve hours each day, every day. Consistent all-day wear provides continuous defocus signals to the retina, maximizing the chance of slowing eye growth.
Skipping days or wearing the lenses only part-time may reduce effectiveness. We understand that busy schedules, sports, and social events can sometimes interfere, but aim for full-time use whenever your child is awake and active. Establishing this routine early helps make it second nature.
Both DIMS and HAL lenses can be worn during most sports and outdoor activities. However, for any sport with ball impact or contact risk, we recommend proper sports goggles with polycarbonate lenses rather than regular spectacle frames, which can break and cause eye or facial injury. A strap alone does not provide eye protection. Pairing myopia control lenses with appropriate protective eyewear, or exploring other options like orthokeratology for high-risk activities, should be discussed with our eye doctor based on your child's specific sport and risk profile.
Swimming requires removing the glasses, so your child will be without myopia control during pool or beach activities. Because outdoor time itself may help slow myopia, we encourage active play even when the glasses are off, as long as safety is maintained.
Getting Fitted and Monitored
Your first visit includes a comprehensive eye exam to measure your child's current prescription, eye health, and rate of myopia progression. We review your family history, lifestyle habits, and how quickly past prescriptions have changed. This helps us determine whether myopia control lenses are appropriate and which technology might be the better fit.
We also discuss your goals and concerns, answer questions about costs and commitment, and explain what to expect in terms of results. If your child is a candidate, we move forward with detailed measurements for the lenses.
Accurate measurements are essential for both DIMS and HAL lenses to work properly. We measure the distance between your child's pupils, the position of the eyes relative to the frames, and the shape of the face to ensure the lenses align correctly. Small errors in these measurements can reduce the effectiveness of the peripheral defocus zones.
- Pupil distance must be precise for the central clear zone
- Frame size and shape influence how well the lenslets align
- We help your child choose frames they will enjoy wearing every day
- Comfort and fit are just as important as style
Both technologies offer strong evidence for myopia control, so the choice often comes down to availability, cost, and personal preference. We explain the subtle differences in design and share what the research shows for children with similar prescriptions and ages. Some practices may have more experience fitting one brand over the other, which can also guide the decision.
If your child has tried one type and experienced discomfort or difficulty adjusting, switching to the other may be an option. We tailor our recommendation to your child's unique visual needs and your family's priorities.
We typically schedule follow-up visits every six months to measure any changes in prescription and, when available, eye length. These regular checks help us confirm that the lenses are slowing progression as expected and also include assessment of visual function, binocular vision, accommodative function, fit, and compliance. If your child's myopia is still advancing rapidly despite good compliance, we may discuss adding other treatments such as low-dose atropine drops.
Annual visits may be sufficient for children whose myopia is well-controlled. We adjust the schedule based on how your child responds and any new symptoms that arise.
Most children tolerate DIMS and HAL lenses without problems, but certain symptoms warrant a prompt call to our office. Persistent headaches, eye pain, sudden blur that does not improve, or trouble adjusting after two weeks may indicate a fitting issue or an unrelated eye condition. Any of the following signs should prompt contact with our office.
- Severe or worsening headaches during lens wear
- Sudden vision changes or loss of vision
- New flashes of light, floaters, or a shadow or curtain across your child's vision
- Eye injury or impact followed by pain or reduced vision
- New double vision or sudden eye turn
- Eye redness, pain, or sensitivity to light
- Difficulty seeing clearly through the central zone after the adaptation period
- Damaged or scratched lenses that interfere with vision
Understanding the Investment
Myopia control lenses generally cost more than standard single-vision glasses because of the advanced technology and specialized manufacturing. Depending on your location and the optical provider, DIMS or HAL lenses may range from several hundred to over a thousand dollars per pair, including frames and coatings. Prices vary, so we encourage you to ask for a detailed estimate during your visit.
This cost is often in addition to the comprehensive eye exam and fitting fees. Some practices bundle services into a package, while others bill separately for each component.
Many vision insurance plans cover standard glasses but do not fully cover myopia control lenses, treating them as an elective upgrade. Some plans may reimburse a portion of the lens cost, or apply the usual eyewear benefit and leave you responsible for the difference. Medical insurance occasionally covers myopia control when it is deemed medically necessary, though this varies widely by carrier.
We recommend contacting your insurance company before ordering lenses to understand your out-of-pocket costs. Our office can provide documentation and codes to support any claims you submit.
As your child's eyes grow and the prescription changes, the lenses will need to be updated, typically every one to two years. Even with myopia control, some progression is common, and wearing an outdated prescription can reduce the effectiveness of the treatment and cause eye strain. Each replacement involves new lenses and possibly new frames if your child has outgrown the old pair.
Budgeting for periodic replacements is an important part of committing to myopia control. The good news is that slowing progression may reduce how often updates are needed compared to a child in standard glasses.
While the upfront expense of DIMS or HAL lenses may feel significant, many families find value in potentially reducing their child's final level of myopia. High myopia in adulthood is associated with increased risk of serious eye conditions such as retinal detachment, glaucoma, and myopic macular degeneration. Slowing progression now may lower those risks and reduce dependence on very strong glasses or contacts later.
We help you balance the financial commitment against the potential long-term benefits for your child's vision and eye health. There is no one-size-fits-all answer, and we support whatever decision best fits your family's situation.
Frequently Asked Questions
Switching between DIMS and HAL lenses is possible if the first choice does not work well for your child. Some children may experience more visual disturbances with one design, and trying the other can resolve those issues. We will reassess measurements and fit to ensure the new lenses perform optimally.
Inconsistent wear reduces the myopia control effect because the defocus signals are not present during the hours the glasses are off. If your child frequently forgets or refuses to wear the lenses, we may see little to no slowing of progression. Building a strong daily routine and addressing any comfort issues early can improve compliance and outcomes.
DIMS and HAL lenses do not cure or reverse existing myopia. They are designed to slow the rate at which nearsightedness worsens, meaning your child may still need glasses or contacts, but potentially with a milder prescription than they would have developed without treatment. The goal is harm reduction, not elimination of myopia.
Combining DIMS or HAL lenses with low-dose atropine eye drops may offer additional slowing in some children, especially those with aggressive myopia progression. Research on combination therapy is still emerging as of 2025, but early findings are promising. We can discuss whether this approach makes sense for your child based on their individual response and risk profile.
Both DIMS and HAL lenses are suitable for active children when fitted into durable, well-fitting frames. The choice between the two is less about activity level and more about optical design preferences and how well each lens performs during the initial adaptation period. We may recommend impact-resistant materials and secure frame styles regardless of which technology you choose.
Getting Help for DIMS (MiYOSMART) vs HAL (Stellest)
If you are considering myopia control lenses for your child, our eye doctor can perform a thorough evaluation and guide you through the options. We will assess whether DIMS or HAL technology is appropriate, explain the expected benefits and costs, and create a personalized plan to protect your child's vision for the future. Results vary by child, these lenses do not cure myopia, and success requires regular exams and monitoring.