| 摘要 |
<p>PURPOSE:To obtain a material favorable from the standpoint of a cure effect and a degree of fatigue by a method wherein a tint (color and reflectance) on at least the surface of an optical material to be opposed to eyes is specified when the size and arrangement of pores is constant. CONSTITUTION:In the title optical material made of a synthetic resin sheet of a polyvinyl chloride or other vinyl resin, one through hole or transparent part 2 is shaped into a circle of 0.7 - 2.0mm diameter or a polygon inscribed or circumscribed on said circle ; the plurality of through holes or transparent parts 2 are arranged so as to form a triangle or square with an edge having a length l of 3.0 - 5.0mm ; and the other part is an opaque part 3. On at least a part containing the through holes or transparent parts 2 on the surface of the optical material to be opposed to eyes, a tint is specified using a Munsell color system so as to be in the range of a 8 or less lightness and a 10 or less purity regarding a hue in the range of a hue circle 5BG - 5PB (on the side including B), or in the range of a 6 or less lightness and a 9 or less purity regarding a hue in the range of a hue circle 5R - 5G (excepting the aforesaid range 5BG - 5PB).</p> |
