Design: Peripheral defocus lens with single vision distance 10mm diameter central zone and asymmetric shift to an add of 1.9D at 25mm from centre.
The MyoVision Pro spectacle lens employs technology designed jointly by the Vision CRC in Australia and Carl Zeiss Vision. It is described as an "asymmetric design. Its clear central aperture extended approximately 10 mm either side of center along the horizontal meridian and a similar distance inferiorly to provide clear vision for convergence and down-gaze. The design was optimized to achieve reduced astigmatism in the horizontal meridian while attaining a positive additional peripheral power of 1.9 D 25 mm from the axis in that meridian. Being an asymmetric design, different lens blanks for right and left eyes were required."1
Myopia control mechanism
The presumed mechanism adheres to the peripheral defocus theory, whereby the peripheral retina receives myopic defocus as a slow-down or stop signal for eye growth. This has been shown in animal models - Earl Smith III is arguably the world's leading researcher in this area and you can read a summary lecture of his here.
Myopia control efficacy
A single 12-month duration randomized controlled trial in Chinese children aged 6-16 years tested three novel spectacle lens designs compared to a single vision spectacle control. One design showed a 0.29D reduction in refractive progression in children aged 6-12 years with a parental history of myopia. There was no difference in axial length change between the single vision spectacle wearing control group and the test lenses. See the scientific paper summary below.
The ideal childhood myope candidate in age and refraction for the MyoVision Pro spectacle lens is not described by the manufacturers, but the participant characteristics in the clinical trial can be noted.
Peer reviewed science on MyoVision Pro efficacy and safety
Sankaridurg et al 2010. Spectacle Lenses Designed to Reduce Progression of Myopia: 12-Month Results. [link to open access paper] [link to Myopia Profile paper review]
Chinese children (n=210) aged 6-16 years with myopia -0.75 to -3.50D and astigmatism no more than 1.50D were fit with one of three novel design spectacle lenses or a single vision spectacle control. Over 12 months in this randomized controlled trial, children aged 6-12 years with a parental history of myopia showed -0.68D vs -0.97D in one of the test lenses compared to SV respectively. There was no significant effect on axial length myopia progression.
- Sankaridurg P, Donovan L, Varnas S, Ho A, Chen X, Martinez A, Fisher S, Lin Z, Smith EL 3rd, Ge J, Holden B. Spectacle lenses designed to reduce progression of myopia: 12-month results. Optom Vis Sci. 2010 Sep;87(9):631-41. (link)