Masunaga Optical Mfg Co., Ltd is the oldest eyeglass maker in Japan and located in Fukui City, Fukui Prefecture, one of the three biggest eyeglass frame producing districts in the world.
Masunaga Eyeglass was designed by Kazuo Kawasaki who was born and raised locally. The eyewear was awarded Silmo d’Or at the Silmo Eyeglass trade show held at Paris in 2000.
Without using screws and by applying lightweight and flexible beta titanium in its frame, Masunaga eyeglass has achieved a high level of comfort for the wearer. By attaching the lenses to the frames at only one point, it is designed so that the vision is not distorted when the arms are flexed at the temple points. The lenses and the pupils are always equidistant.
Masunaga eyeglass, born from a concept of “smart and high technology”, achieved functionality and nobleness realized by the combination of  the Kazuo Kawasaki’s industrial design and Matsunaga’s superb techniques.

Edo Bekko is a tortoiseshell handicraft made in Tokyo, applied to eyeglass frames, gold-lacquered objects and carvings.
   Bekko has a long history: a biwa (Japanese lute) preserved in the Shoso-in imperial treasure house (dating to the C8th AD) features the shell of a hawksbill turtle. In the Edo period, more sophisticated gluing techniques led to more complicated effects using bekko.
   Hawksbill turtle shell is the main material for Edo bekko, and is used to make a variety of stationery items and accessories.
   Hawksbill turtles live in the vicinity of the equator and can measure up to 180 cm in length and 200 kg in weight after 50 or 60 years. The number of shells is always 13; the transparent part, which comprises only 10% of the shell, is treasured, the other parts, which are black, are called 'fu'.
   Edo Bekko is a very valuable and graceful craft.