{"cm":[],"snellen":[],"diopter":{"normalized":[],"differential":[{"left_sph":"3.25","left_cyl":"-1.25","left_axis":"63","right_sph":"3.5","right_cyl":"-2","right_axis":"108","date":"2015-08-25"},{"left_sph":"2.25","left_cyl":"-1.25","left_axis":"51","right_sph":"2.25","right_cyl":"-2","right_axis":"125","date":"2018-05-08"},{"left_sph":"2","left_cyl":"-1","left_axis":"60","right_sph":"2","right_cyl":"-1.75","right_axis":"125","date":"2018-09-20"}]}}