Optician more important and dignified. Far-sighted or aging colonial Americans imported spectacles from Europe. Spectacles were primarily for the affluent and literate colonists, who required a valuable and precious appliance. Benjamin Franklin in the 1780s developed the bifocal. Bifocal lenses advanced little in the first half of the 19th century. The terms bifocal and trifocal were introduced in London by John Isaac Hawkins, whose trifocals were patented in 1827. In 1884 B. M. Hanna was granted patents on two forms of bifocals which become commercially standardized as the "cemented" and "perfection" bifocals. Both had the serious faults of ugly appearance, fragility,
The Sky Over My Spectacles this manga. The Sky Over My Spectacles Holly Ellingwood characterises the manga as being more explicit than previous yaoi manga releases, but feels that there is enough character development to carry the story and render it romantic. Hannah Santiago, writing for the appendix to , felt that the romance was realistically developed and appreciated the equality in their relationship. June Shimonshi, writing for Library Journal describes the manga as "formulaic" and as being solely driven by sex, finding the word balloons and panels difficult to follow. Shimonshi recommends Love Mode and the Finder series for those looking for explicit yaoi