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What is Multispectral Refraction Topography (MRT)​? 

--- A New Technology for Measuring Peripheral Refraction

Why is it essential to assess peripheral refraction? 
Orthokeratology has gained popularity, alongside defocus contact and spectacle lenses. Recent research has renewed interest in these options for correcting peripheral hyperopic defocus and reducing signals that lead to eye elongation.

* Liang J, Pu Y, Chen J, et al. Global prevalence, trend and projection of myopia in children and adolescents from 1990 to 2050: a comprehensive systematic review and meta-analysis. British Journal of Ophthalmology 2025;109:362-371.
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Peripheral defocus is one of the important factors contributing to myopia

The global population's myopia problem is becoming increasingly severe

The World Vision Report released by the World Health Organization (WHO) in 2019 revealed that 2.6 billion people worldwide are affected by myopia, including 312 million adolescents under the age of 19. By 2030, the global number of individuals with myopia is expected to rise to 3.4 billion.

The latest research indicates that myopia affects nearly one-third of children and adolescents globally. It is projected that by 2050, over 740 million children and adolescents worldwide will be affected by myopia*.

Multispectral Refraction Topography (MRT) enables the simultaneous measurement of refraction at millions of points within seconds.

How can MRT effectively identify peripheral defocus?
Peripheral Refraction Profile

* Hoogerheide J, Rempt F, Hoogenboom WP. Acquired myopia in young pilots. Ophthalmologica. 1971;163(4):209-215. doi:10.1159/000306646

II. Guidelines for Fitting Contact Lenses and Ortho-K Lenses

What critical clinical challenges can MRT resolve?

I. Assessment and Management of Myopia Progression

Research by Hoogerheide indicates that individuals with type I, III, and IV refractive patterns (myopic types) have a significantly higher likelihood of developing myopia compared to those with other refractive topographies*.
Each eye’s peripheral defocus is unique, various risks require tailored myopia control strategies and personalized products.​
Step 2: Machining technology for freeform surfaces to correct individual peripheral refraction;  
Peripheral Refraction Profile

  • Observe changes in peripheral defocus morphology before and after wearing the lens.
  • Compare the differences in peripheral defocusing morphology across various shaping strategies.

  • Evaluate the effects of wearing the lens in specific conditions on peripheral defocusing morphology.


Paper:

1. Mandantuoya, Ao M, Zhang Y. The relationship between relative peripheral refraction and axial length elongation in myopic children wearing orthokeratology lenses using a novel wide-angle multispectral refraction topographer. Cont Lens Anterior Eye.

2. Wen K, Wu Y, Yang B, Liu L. Novel quantitative analysis of relative peripheral refraction changes in orthokeratology and their relationship with one-year axial elongation. Photodiagnosis Photodyn Ther. 2025;55:104739. 

3.Li T, Chen Z, She M, Zhou X. Relative peripheral refraction in myopic children wearing orthokeratology lenses using a novel multispectral refraction topographer. Clin Exp Optom. 2023;106(7):746-751. 
4.Xu, M., Yang, Y., Zhang, F. et al. Correlation Between Relative Peripheral Refraction and Efficacy of Myopia Control After Wearing Multifocal Soft Contact Lenses in Children. Ophthalmol Ther 14, 755–771 (2025).

Step 1: Utilize MRT to assess the individual peripheral refraction profile；  

Correction of Peripheral Refraction

Paper:

1. Lei S, Wu Y, Kou J, Chen Q, Liu L. The effect of individualized ocular refraction customized spectacle lenses on myopia control in schoolchildren: A 1-year randomised clinical trial. Ophthalmic Physiol Opt. 2024;44(6):1279-1289. 

2. Kou J, Wu Y, Lei S, Xiong L, Chen X, Liu L. Myopia control efficacy of individualised ocular refraction customisation spectacle lenses: A 2-year follow-up study. Ophthalmic Physiol Opt. Published online August 11, 2025. 


Correction of Peripheral Refraction

Step 3: Using multiple lenslets offers reliable guidance for managing myopic defocus;
Peripheral Refraction Profile

III. ​Customizing Myopia Lenses-Individualized Ocular Refraction Customization (I.O.R.C.) Spectacle

Thondar Solution: Making Customized Myopia Management Lenses is the future​