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, J0, J45) 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° 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.
The fast development of IOLs has provided patients with optical performance that more closely resembles that of the healthy human eye, however such optical performance experience is achieved only for on-axis (0 degrees) optical performance, leaving the peripheral vision inferior to the health human eyes.. Recently, studies have demonstrated the importance of peripheral vision to patients' daily life. To solve this problem, an IOL with improved peripheral vision has been proposed. The IOL is designed to optimize peripheral vision in a 40-degree field of view (FOV) under 3 mm pupil diameter, while maintaining on-axis optical performance. The design results shows that the designed IOL provide the same level of central field optical performance compared to healthy human eyes and traditional IOLs as well as the improving peripheral vision. This IOL design may help to reduce the risks related to peripheral vision loss in daily life.
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