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What to do when a patient doesn't respond to atropine

Posted on September 7th 2020 by Connie Gan

In this article:

What do you do when your patient doesn't respond to your low-dose atropine treatment? Do you increase the concentration? Change strategy?

Low-concentration atropine of at least 0.025% has been shown in current studies to be effective in controlling myopia progression in children. However, TN is left stumped a 11-year-old child who has not been responding to atropine 0.025%, showing very fast progression in under a year, and shared the case with the Myopia Profile community.

TN Hi Team, Wanting to pick the brain fund here. I've got an 11 y.o boy progressing myopia. 2018 - 2019 progressed from -2.25 to -3.50 SEq (cyl of 1.0D). Placed on 0.025% low dose atropine notce, once at night in each eye. 2020 review, (6/12), patient returns late for follow up. RE -6.75 Seq, LE -5.75Seq. Patient appears to be still progressing, if anything more so, parents report reduced screen time and good visual hygiene. I'm looking at referring for ophthalmology care but would like to know what else I could do? Thanks guys!TN … patient has been compliant with drops, they were only on single vision so I could discuss further options…

Does everybody respond to low-dose atropine?

KG …Some kids just don’t respond to atropine. I don’t have the % in my head from the studies on that…PC “Up to 12% of children may exhibit a poor response (i.e., progress >1.0 D over 1 year) even on high-dose atropine. A poorer response was associated with younger children, a higher degree of myopia at baseline and myopic parents.” - Updates on Myopia, 2020

Low-dose atropine is useful for slowing myopia progression and axial elongation. Unfortunately, not all children will respond well. The ATOM2 study showed that around 18% of participants responded poorly to 0.01%, 0.1% and 0.5% atropine, regardless of concentration, by showing more than 1D of progression over two years.1  In the concentration used here, 0.025%, the LAMP study found 13% progressed by more than 1D in a year - by comparison, it was 15%, 28% and 37% in the 0.05%, 0.01% and control groups respectively.

Which children are likely to be poor responders? Loh et al showed that a small group of children with fast myopia progression while having atropine treatment. This group of children tend to be younger, are highly myopic and have two myopic parents.You can read more about the frequency and factors involved in Non-responders to Myopia Control Treatments in this blog.

Is ophthalmologist referral required?

JWW Please help me understand why this patient would be referred to ophthalmology. Optometrists have a much better understanding of myopia control/binocular vision and can certainly monitor for pathology. If you feel the need to refer, why not another optometrist? Some myopia may not be controlled. This patient may have progressed more without treatment. Consider the suggestions above, but don’t automatically punt to ophthalmology. Don’t ever refer unless the patient can get BETTER care by someone else.PC Agree, I was thinking the same. What can an ophthalmologist do or prescribe for myopia management for this child that we can't? None. If anything the options they offer are less than what are available to us - they don't fit orthoK or MF SCLs. An ophthalmologist will likely simply increase the atropine dosage to 0.05% or 0.1%, or more. What if this child is a non-responder to atropine? A higher dose might not help, and valuable time is then wasted. I suggest an optometrist equipped with a topographer and biometer is a better place to start than referring to ophthalmology.KG I agree as well … Your point about referral to another optometrist is very important, especially in countries where optometry has a wide scope of practice and can prescribe atropine like Aus, NZ and US. Outside of these countries, and even if all suggestions I’d made are considered, working with ophthalmology to rule out any pathology could be a prudent choice - even as a single referral. I completely agree that optometry is the front line of myopia management.

Some of the commenters questioned the necessity of an ophthalmology referral as there is no abnormal pathology suspected. Optometrists as primary eye care practitioners are also well-positioned in terms of time and access to optical interventions to administer myopia control.

Therefore, it is worthwhile to considering referring to other optometrists who have the capacity to provide the services to control myopia progression if you are unable to do so.

In some countries whereby optometrists are unable to prescribe atropine, then referral to ophthalmology may be necessary if this is to be considered as part of the treatment plan. Even if atropine wasn't to be considered, ophthalmology involvement is important in cases of high childhood myopia - in a study of 112 children under age 10 with myopia of more than 6D, only 8% had 'simple high myopia' with no other associated ocular or systemic associations. 54% had an underlying systemic condition (eg. developmental delays, Marfan, Stickler, Downs syndrome) and the remaining 38% had further ocular problems associated with high myopia such as lens subluxation, coloboma, retinal dystrophy).4  

This case doesn't quite fit the criteria as the child is 11, but this child is young with high myopia - hence it wouldn't be inappropriate for a careful practitioner to consider even a single referral to rule out pathology. However there may be more to determine in this case first, from the optical side of things.

What else can we do?

Evaluate cycloplegic refraction and binocular vision

KG …but say for example his accom lag has increased a lot on 0.025%, that’s driven an eso.... well research indicates eso myopes progress faster in SVD. Understanding his BV is also important as I’ve had kids with reduced VA and big refraction jumps where we’ve got the ophthals’ opinion to rule anything else out, but once I was quite sure that I was primarily dealing with a big BV issue. (Eg. Accom spasm)…PC get him back for cyclo to exclude any accommodative spasm, better still have his axial length measured which will give you more info going forward…BS Is this patient a big exophore? If so then his visual system is behaving like an exotrope and he accommodates to maintain fusion, that's why his myopia isn't stabilizing even with the atropine. High exo patients don't respond well to plus.

This patient appears to have exhibited a -3.25D jump in the right eye and a -2.25D jump in the left eye in less than a year. This is enormous progression, outside the expected of around -0.50D per year for his age (in a single vision correction)so it's crucial to evaluate the true progression - a cycloplegic refraction will help with this, especially where axial length measurements aren't available.

The binocular vision (BV) status of the patient could also play a role in driving myopia progression. An example, as KG suggested, is that the atropine might affect his accommodation which could then induce esophoria, leading to hastened myopia progression. Therefore, BV issues that are worthwhile investigating are:

  • Accommodative lag and phorias– high lag of accommodation with combination of esophoria at near is associated increased rates of myopia progression.6
  • AC/A ratio – high AC/A ratio was associated with myopia progression.7
  • Presence of accommodative spasm – cycloplegic refraction will avoid a subjective refraction result influenced by possible spasm.

A thorough assessment of a child’s BV status will allow us to identify and manage potential BV issues that may hasten myopia progression. This can also allow us to decide on the best form of optical intervention.

Prescribe an effective optical intervention

KG … What optical correction was he wearing? Anything other than SVD could do a better job, in potential combo with atropine.SB He must have had a huge growth spurt as well, but not too old to try maybe ortho k perhaps even though he is quite myopic. If contacts don’t suit then you would maybe have to try a multifocal spectacle or Dims when available. You tried myopia control medically and did your best, if they don’t return for follow up it’s hard to know.PC …Fit him with MFSCL or DIMS glasses. OrthoK maybe depending on your experience and his corneal shape. I’ve seen many cases where the child has not responded to atropine, so it’s time to try an effective optical intervention.DB Once pathology is ruled out, why not try NaturalVue multifocal? Power range to-12.25 in 0.25 steps. Most practitioners report good control…KG yes, I think that’s a key point in this case - no myopia controlling optical intervention has been prescribed yet for this child, only SVD.

Spectacle lens options

Instead of single vision lenses which do not contribute to slowing progression - as this child has been wearing - it is best to prescribe some form of optical treatment which corrects as well as controls his myopia. When it comes to spectacles, the options are as follows.

  • Progressive addition lenses (PALs): These work well with children who have high accommodative lag and esophoria.6
  • Bifocal spectacle lenses: These appear to work better than PALs, on average8
  • Defocus Incorporated Multi-Segment (DIMS) lenses: These appear to slow myopia progression and axial elongation much more effectively than PALs and slightly more effectively than bifocals. It's important to note, though, that DIMS lenses will likely not influence any binocular vision disorder - they don't provide an orthoptic 'add' as PALs or bifocals do.9 If binocular vision is normal and DIMS lenses are available, these are the clear spectacle lens of choice.

Contact lens options

If parent and child are willing, contact lenses options for myopia control appear to work more effectively than PAL and bifocal spectacles, and similarly to DIMS spectacle lenses. These also have the advantage of near-worldwide availability for at least one of the following options, all of which have been specifically investigated for their myopia control efficacy.

  • Orthokeratology (OK): In this particular case, if the cycloplegic refraction gives the same result, the degree of refractive error is close to the upper limit of typical OK correction ability. Depending on the patient’s corneal curvature and the practitioner's experience, OK at this degree of myopia may or may not be feasible. OK slows progression by around half on average.10
  • MiSight contact lenses: These daily disposable contact lenses show similar efficacy to OK for myopia control,11 however if the right eye refraction is confirmed at -6.75 spherical equivalent, the patient will be just outside the availability range of up to -6.00D.
  • NaturalVue contact lenses: These daily disposable lenses are available up to -12.00D. There is no available data on refractive or axial length efficacy in a randomized controlled study for NaturalVue, but a case series report on pre- and post-fitting showed good results.12
  • Mylo EDOF (extended depth of focus) contact lenses: These custom made monthly lenses show similar efficacy to multifocal (presbyopic) contact lenses13 and are availabe up to -15.00D with a variety of base curves and diameters.
  • Multifocal (presbyopic) soft contact lenses: The CooperVision Biofinity centre distance lens with a +2.50 Add has shown moderate myopia control efficacy,14 similar to Mylo but perhaps not quite as good as MiSight and OK. These lenses, though, have the advantage of being available to a majority of eye care practitioners throughout the world.

How do optical treatments compare with atropine?

As monotherapy, on the basis of the one year LAMP study2 of 0.01%, 0.025% and 0.05% atropine, which are those typically prescribed to balance efficacy and side effects - 0.05% atropine likely works as well as DIMS spectacle lenses, orthokeratology or MiSight contact lenses when each are used individually as a single treatment.

Regarding combination treatments, There are early studies showing a potential synergistic effect of atropine 0.01% and orthokeratology.15 Baseline data has been presented on atropine 0.01% plus multifocal contact lenses (Biofinity centre distance +2.50 Add) indicating good short-term tolerance of combination treatment, with data on efficacy to follow.16

Take home messages:

  1. While low-dose atropine may be a good myopia control treatment option, it may not work effectively in around 15-20% of patients. This appears to be a similar observation across atropine concentration, when considering multiple studies.
  2. Fast shifts in refraction to high childhood myopia (over 5-6D, especially if under 10 years of age) may warrant involvement of ophthalmology, to a level dependent on your scope of practice; but keep in mind that noone is better placed to manage vision and refraction than primary eye care.
  3. This child's enormous apparent myopia progression requires confirmation with a cycloplegic refraction, especially where axial length measurement is not available to confirm the progression. Binocular vision status could also have factored into faster-than-average progression.
  4. Don't forget that optical corrections can work as well as, or even in combination, with atropine.

Read more on the topic of 'when it's not working':


Meet the Authors:

About Connie Gan

Connie is a clinical optometrist from Kedah, Malaysia, who provides comprehensive vision care for children and runs the myopia management service in her clinical practice.

Read Connie's work in many of the case studies published on MyopiaProfile.com. Connie also manages our Myopia Profile and My Kids Vision Instagram and My Kids Vision Facebook platforms.

About Kimberley Ngu

Kimberley is a clinical optometrist from Perth, Australia, with experience in patient education programs, having practiced in both Australia and Singapore.

Read Kimberley's work in many of the case studies published on MyopiaProfile.com. Kimberley also manages our Myopia Profile and My Kids Vision Instagram and My Kids Vision Facebook platforms.


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