A spectacle lens design for myopia control and its optical performance analysis

The prevalence of myopia has increased worldwide. One of the effective ways to control myopia progression is specially designed spectacles. However, the optical performance of the eye wearing such spectacle lenses were rarely reported. This study presents a spectacle lens design for myopia control along with optical performance analysis. The spectacle lens has an optical zone of 9 mm in diameter, surrounded by lenslets located in a circular zone from radial distance of 4.5 mm to 17 mm. The lenslets are arranged in the form of a Fibonacci spiral. The optical structure of the spectacle lens was built in the design software Zemax. The peripheral refraction (M, J(0), J(45)) of the eye wearing designed spectacle lens was calculated and compared with results from the eye wearing spectacle lens with lenslets arranged in the same way as the two commercially available spectacle lenses. Additionally, the MTF (Modulation Transfer Function) of the eye with rotation was calculated as well. The results show that the myopic defocus within the +/- 40 degrees field of view as well as MTF during eye rotation are higher than these of the other two types of lenslet arrangements, demonstrating that the new spectacle lens may control myopia progression more effectively and provides a better visual quality when the line of sight deviates from the center of the lens.