French physicist Augustin Fresnel invented the Fresnel lens for lighthouses. When it"s extraordinary magnifying capability was discovered he became a household name. Exclusively designed by Reno, Fresnel bookmarks are a must have and a great gift for a reader. Available in the shape of a glass magnifying lens, the design is unique and eye catching. Ultra thin and lightweight these little magnifying lenses can be stored anywhere and have a ribbon to indicate their place in your book.