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H.A.L.T. technology, a prescription from an optometrist and precise application in children’s everyday lives
A child doesn’t wear a piece of technology: they wear glasses. They wear them whilst looking at the blackboard, reading, playing, running and growing up. That’s why, when it comes to lenses designed to manage myopia progression, the product name is only part of the story.
Essilor Stellest lenses correct existing short-sightedness and are designed to slow its progression during development. They utilise H.A.L.T. technology, an optical design supported by published clinical studies conducted at two and five years. Assessment, diagnosis, prescription, indications and clinical monitoring remain the sole responsibility of the ophthalmologist.
Isolani’s work begins with that prescription: selecting a stable frame, taking measurements whilst the child is in a natural posture, crafting the spectacles with precision, and ensuring they retain their correct alignment over time. It is here that an advanced lens truly becomes part of everyday life.
Inside Stellest: the H.A.L.T. design
H.A.L.T. stands for Highly Aspherical Lenslet Target. The name describes a structure consisting of highly aspheric microlenses arranged around a central zone that provides the prescribed correction. The aim of the design is to combine sharp vision with a myopic defocus range provided by the lens.
The acronym does not mean that the technology can ‘stop’ short-sightedness in every child. The studies measure an average slowdown in progression within the groups observed; individual responses may vary and must be assessed over time by an ophthalmologist.
The process begins with a referral from an ophthalmologist
It is not the brand that determines the process, nor is it the optician’s that makes a clinical decision. It all starts with the prescription and the instructions from the ophthalmologist. Isolani carries out that prescription and oversees the technical aspects of frame fitting, measurements, centring, manufacture, adjustments and aftercare.
We work with leading manufacturers and are able to produce the various technologies listed. Stellest is therefore a significant and well-documented solution, not a one-size-fits-all commercial offering, nor a lens that is automatically suitable for all children.
What do the studies on H.A.L.T. lenses reveal?
The randomised, double-blind trial published in JAMA Ophthalmology The study followed short-sighted children aged between 8 and 13 for two years. Lenses featuring highly aspheric micro-lenses showed, on average, slower progression of myopia and less axial lengthening compared with the monofocal lenses used as a control.
The five-year peer-reviewed follow-up observed that the control effect was maintained in the group followed up over the long term. Here too, the data describe the study population as a whole and do not predict the outcome for any individual child. The paper also discloses its links with Essilor: this is an important point to be aware of and to report transparently, without, however, disregarding the value of the scientific publication.
Consistency of use is key. A lens designed to be worn throughout the day must be worn in accordance with the instructions provided and must remain stable on the eye. Research, prescription and technical fitting are not separate steps: they only work if they are consistently linked.
Scientific insights: a two-year randomised clinical trial e five-year peer-reviewed follow-up. Information on the technology: Essilor Stellest official page.
Technology meets the Isolani method
The optical design of the lens must remain in the intended position in front of the eyes. For this reason, we observe the bridge, temples, tilt, fit and stability of the frame during everyday activities, not just when the child is sitting still in front of a testing instrument.
In theIsolani Experience The prescription, lenses, frames and fitting of the finished pair of glasses all form part of the same process. This is the method we use for all children’s glasses, not just those designed to manage progressive myopia.
Behavioural Alignment: our trump card
The Isolani Behavioural Alignment It takes into account measurements, posture, head tilt, fit and the natural way in which the wearer uses their gaze. This is not a clinical promise: it is the precision of the fitting process that enables us to position the lens design exactly where the glasses will actually be worn.
When it is useful, in the Simulation Room We can also explain and compare the options before the work begins, helping the family to better understand the process.
A frame that stays secure even as your child grows
Children’s frames can become loose, slip or change their fit. After delivery, we check the fit and stability to ensure that the lenses remain in their intended position. This technical service does not replace the eye tests recommended by an optometrist, but complements the work carried out on the glasses.
Find out more about the programme dedicated to children's glasses and our independent guide to Progressive short-sightedness in children.
As we prepare to return, our Back to School 2026: Eyewear, School and Children’s Eyesight It provides practical guidance on fit, digital features, and checks and adjustments for glasses.
Stellest and MiYOSMART: different technologies, the same rigour
H.A.L.T. and D.I.M.S. are two different models, both supported by research programmes. We do not rank brands, nor do we use percentages obtained from different studies to make comparative advertising claims. We implement the solution in line with the brief we have received and apply it with the same technical rigour.
To find out more about the cluster’s other in-depth analysis, you can read MiYOSMART lenses: D.I.M.S. technology and the Isolani method.
Practical experience and professional discussion
Between 2023 and 2025, we organised three events focusing on the progression of myopia and vision at different stages of life, attracting a total of over 300 participants, including ophthalmologists, orthoptists and eye care professionals.
This is how Isolani has been working since 1929: studying the latest technologies, respecting the optometrist’s expertise, and turning every prescription into a pair of glasses that are precise, stable and supported over time.
Read the reports on Focus on Myopia 2023, Focus on Myopia and Presbyopia 2024 e Evolving Vision 2025.
Frequently Asked Questions about Essilor Stellest lenses
Do Stellest lenses treat short-sightedness?
No. They correct existing short-sightedness and are designed to slow its progression during development. The individual’s progress should be monitored over time by an ophthalmologist.
What does H.A.L.T. technology mean?
It stands for ‘Highly Aspherical Lenslet Target’. The design combines the zone with the prescribed correction and a structure of highly aspherical microlenses specifically designed to correct myopic defocus.
Is Stellest suitable for all children?
Not automatically. The lens must be in line with the prescription and the optometrist’s recommendations, as well as with the child’s characteristics and needs.
Do the percentages from the studies apply to every child?
No. They reflect the average results observed in specific groups. Individual responses may vary and are assessed by the ophthalmologist throughout the course of treatment.
Why is it important to wear contact lenses consistently?
Studies suggest that the duration of use is an important part of the process. However, the method and duration must be in line with the guidance received and the child’s needs.
Why are mounting and alignment so crucial?
This is because the optical design must remain stable in front of the eyes. Isolani’s Behavioural Centring takes into account measurements, posture, fit and the actual use of the spectacles.
The information on this page is provided for information purposes only and relates to the optical and commercial sectors. It does not contain any medical, clinical or diagnostic content.