Myopia: Mechanisms, Interventional Strategies, and Clinical Evidence

On March 1, 2022, we announced the call for a new feature issue on an active area of basic science explorations and novel clinical interventions designed to reduce the global public health burden of myopia. This feature issue will be published in the fall of this year, and we are excited to bring new discoveries and clinical evidence in this field to publication.

For the first time, we have a U.S. Food and Drug Administration–approved clinical intervention designed to slow the progression of childhood myopia.1 This is an exciting moment in the arc of our history to be able to provide a fundamentally different approach for the treatment of refractive errors. There are numerous active areas of investigation to better understand the mechanisms behind ocular growth and development, and this work is not new. For more than a generation, our two former editors in chief and many others have worked tirelessly to advance the conversation among research agencies, public health organizations, and the National Institutes of Health to pave pathways for funding clinical and laboratory research in this area. That advocacy has resulted in multicenter clinical studies2–7 and observational studies that evaluated demographics and the natural history of refractive error development. More recently, funded work addresses gene and protein expression to understand signals that drive ocular growth.8,9 Although we are making progress, there is much to do.

In some laboratories, research is dedicated to understanding the visual signals that can drive ocular growth and emmetropization. Work by Earl Smith and colleagues has advanced our understanding of how powerful the visual signals can be and provided some insights on the directionality of these driving forces.10 Tom Norton and colleagues have provided insights on the effects of spectral composition and its impact on ocular growth.11 Others have focused on underlying biological mechanisms—the cellular and molecular transduction of visual signals to understand what ultimately drives ocular growth and tissue remodeling.9

While we continue exploring fundamental mechanisms, clinical interventions are under development and in clinical trials to gauge efficacy. These clinical evaluations include contact lenses that modulate retinal defocus, orthokeratology, and more. There are evaluations of novel spectacle lens designs as well. Pharmaceuticals that include atropine, novel small molecules, and biological therapeutics are all strategies under investigation.

Fortunately, the importance of this research area is gaining traction. The World Health Organization has been helpful in brining attention to the magnitude of the problem of refractive error. The epidemic of myopia is not limited to developed countries, and although myopia in Asia is common, the United States has a sizeable problem that is growing as well. Moreover, there is now wider recognition that myopic refractive error is not only a correctable functional impairment but also a risk factor for related causes of uncorrectable vision loss due to glaucoma, retinal detachments, and myopic macular degeneration.12 This broader understanding of the condition and its public health importance should ultimately benefit patients, but there is much to do between where we are now and a new paradigm that can reduce the burden of myopia and the associated visual impairment.

It is an exciting time to see so much attention and energy devoted to the problem of refractive error, and we are excited to bring this feature issue to life with an outstanding international team of guest editors and investigations from leading authors worldwide.

1. Chamberlain P, Peixoto-de-Matos SC, Logan NS, et al. A 3-year Randomized Clinical Trial of MiSight Lenses for Myopia Control. Optom Vis Sci 2019;96:556–67. 2. Walline JJ, Walker MK, Mutti DO, et al. Effect of High Add Power, Medium Add Power, or Single-vision Contact Lenses on Myopia Progression in Children: The BLINK Randomized Clinical Trial. JAMA 2020;324:571–80. 3. Berntsen DA, Mutti DO, Zadnik K. Study of Theories About Myopia Progression (STAMP) Design and Baseline Data. Optom Vis Sci 2010;87:823–32. 4. Bullimore MA, Reuter KS, Jones LA, et al. The Study of Progression of Adult Nearsightedness (SPAN): Design and Baseline Characteristics. Optom Vis Sci 2006;83:594–604. 5. Kleinstein RN, Mutti DO, Sinnott LT, et al. Uncorrected Refractive Error and Distance Visual Acuity in Children Aged 6 to 14 Years. Optom Vis Sci 2021;98:3–12. 6. Kleinstein RN, Jones LA, Hullett S, et al. Refractive Error and Ethnicity in Children. Arch Ophthalmol 2003;121:1141–7. 7. Zadnik K, Jones LA, Irvin BC, et al. Myopia and Ambient Night-time Lighting. CLEERE Study Group. Collaborative Longitudinal Evaluation of Ethnicity and Refractive Error. Nature 2000;404:143–4. 8. Guggenheim JA, Clark R, Cui J, et al. Whole Exome Sequence Analysis in 51 624 Participants Identifies Novel Genes and Variants Associated with Refractive Error and Myopia. Hum Mol Genet 2022;January 12:pre-print before publication:doi 10.1093/hmg/ddac004. 9. Dong S, Tian Q, Zhu T, et al. SLC39A5 Dysfunction Impairs Extracellular Matrix Synthesis in High Myopia Pathogenesis. J Cell Mol Med 2021;25:8432–41. 10. Smith EL 3rd, Hung LF, Huang J. Protective Effects of High Ambient Lighting on the Development of Form-deprivation Myopia in Rhesus Monkeys. Invest Ophthalmol Vis Sci 2012;53:421–8. 11. Gawne TJ, Norton TT. An Opponent Dual-detector Spectral Drive Model of Emmetropization. Vision Res 2020;173:7–20. 12. Bullimore MA, Brennan NA. Myopia Control: Why Each Diopter Matters. Optom Vis Sci 2019;96:463–5.

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