Pentax Corporation

Pentax Sales Co., Ltd.

Yuko Senda

Yasuyuki Tejima

A progressive power lens includes a convex front surface and a concave back surface which is also a progressive power surface. A pattern including distance and near reference area marks is printed on the concave back surface. The near reference area mark includes a closed curve and a scale arranged outside the closed curve. The closed curve is designed so as to enclose near reference areas of a plurality of progressive power lenses each having different dioptric power. The scale is designed so as to indicate the amount of inset of the progressive power lens.

Growing community of inventors

Tochigi-ken, Japan

Yuko Senda