Acta Optica Sinica, Volume. 40, Issue 4, 0422001(2020)
Contact Lens for Controlling Myopia Progression and Correcting Myopia and Astigmatism
A multizone aspheric contact lens was designed to control myopia progression as well as correct myopia and astigmatism. An eye model of -3 D (Dioptre) myopia combined with -1.5 D astigmatism was constructed in Zemax software, based on which the anterior surface parameters of the contact lens were optimized. A multizone contact lens with a diameter of 14.4 mm and a central thickness of 0.06678 mm was obtained. The imaging performance and the relative peripheral myopic shift of the eye model with the designed contact lens were analyzed. The modulation transfer function (MTF) values at 50 cycle/mm are higher than 0.7 under 3 mm (in diameter) pupil for 0°--7° field of view (FOV) for distance vision, indicating that both myopia and astigmatism are corrected. Moreover, the MTFs remain relatively stable when the contact lens rotates within 30° or decentres within 0.7 mm. In addition, the myopic defocus of the model eye with the designed contact lens is up to -9.5 D at 25° FOV under 3 mm pupil, and around -6 D under 6 mm pupil for 0°-30° FOV. The results have indicated that the designed contact lens can provide greater peripheral myopic defocus, exhibiting highly potential to control the myopia progression.
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Yayan Bian, Yongji Liu, Baokai Liu, Jianda Gu. Contact Lens for Controlling Myopia Progression and Correcting Myopia and Astigmatism[J]. Acta Optica Sinica, 2020, 40(4): 0422001
Category: Optical Design and Fabrication
Received: Jun. 13, 2019
Accepted: Oct. 21, 2019
Published Online: Feb. 11, 2020
The Author Email: Liu Yongji (yjliu@nankai.edu.cn)