Lentes bifocales: qué son y quién las inventó

#iguru_soc_icon_wrap_699287c836894 a{ background: transparent; }#iguru_soc_icon_wrap_699287c836894 a:hover{ background: transparent; border-color: #2c8fa0; }#iguru_soc_icon_wrap_699287c836894 a{ color: #2c8fa0; }#iguru_soc_icon_wrap_699287c836894 a:hover{ color: #ffffff; }.iguru_module_social #soc_icon_699287c8368c31{ color: #ffffff; }.iguru_module_social #soc_icon_699287c8368c31:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_699287c8368c31{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368c31:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368d52{ color: #ffffff; }.iguru_module_social #soc_icon_699287c8368d52:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_699287c8368d52{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368d52:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368df3{ color: #ffffff; }.iguru_module_social #soc_icon_699287c8368df3:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_699287c8368df3{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368df3:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368e64{ color: #ffffff; }.iguru_module_social #soc_icon_699287c8368e64:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_699287c8368e64{ background: rgba(44,143,160,0.01); }.iguru_module_social #soc_icon_699287c8368e64:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_699287c8368ed5{ color: #ffffff; }.iguru_module_social #soc_icon_699287c8368ed5:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_699287c8368ed5{ background: rgba(44,143,160,0.01); }.iguru_module_social #soc_icon_699287c8368ed5:hover{ background: rgba(255,255,255,0.01); }