Lentes bifocales: qué son y quién las inventó

#iguru_soc_icon_wrap_68451ccf9c25c a{ background: transparent; }#iguru_soc_icon_wrap_68451ccf9c25c a:hover{ background: transparent; border-color: #2c8fa0; }#iguru_soc_icon_wrap_68451ccf9c25c a{ color: #2c8fa0; }#iguru_soc_icon_wrap_68451ccf9c25c a:hover{ color: #ffffff; }.iguru_module_social #soc_icon_68451ccf9c2881{ color: #ffffff; }.iguru_module_social #soc_icon_68451ccf9c2881:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_68451ccf9c2881{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2881:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2972{ color: #ffffff; }.iguru_module_social #soc_icon_68451ccf9c2972:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_68451ccf9c2972{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2972:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2a13{ color: #ffffff; }.iguru_module_social #soc_icon_68451ccf9c2a13:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_68451ccf9c2a13{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2a13:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2a84{ color: #ffffff; }.iguru_module_social #soc_icon_68451ccf9c2a84:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_68451ccf9c2a84{ background: rgba(44,143,160,0.01); }.iguru_module_social #soc_icon_68451ccf9c2a84:hover{ background: rgba(255,255,255,0.01); }.iguru_module_social #soc_icon_68451ccf9c2ae5{ color: #ffffff; }.iguru_module_social #soc_icon_68451ccf9c2ae5:hover{ color: #2c8fa0; }.iguru_module_social #soc_icon_68451ccf9c2ae5{ background: rgba(44,143,160,0.01); }.iguru_module_social #soc_icon_68451ccf9c2ae5:hover{ background: rgba(255,255,255,0.01); }