1. World report on vision. https://www.who.int/publications/i/item/9789241516570; 2019.
2. Current status on the development and treatment of myopia;Cooper;Optometry,2012
3. A variational-difference numerical method for designing progressive-addition lenses;Jiang;Comput Aided Des,2014
4. Research of simulation method for evaluating freeform progressive addition lenses;Huazhong;Opt Tech,2017
5. Freeform surface lens design based on numerical solutions of differential equations;Fachao;Opt Tech,2013