It's great in relieving visual discomfort and fatigue when working or gaming on computer for a long time

plastic frame without spring hinges

and other outdoor activities

BLOCKING OVER 30% BLUE LIGHT - Blue light blocking technology naturally blocks out the recommended 30% of blue light rays: do not settle

Lens width about 1 7/8 inches (48mm)

Rectangle Blue Light Filter Eyeglasses LX19039-BB40 Color:Blue It's great in relieving visualAcrylic lens, metal frame with spring hinges Block 40% blue light, almost no color distortion Frame width about 5 3 16 inches (132mm) Lens width about 2 1 16 inches (53mm) Lens height about 1 1 2 inches (39mm) Bridge(DBL) about 1 2 inches (13mm) Temple length about 5 5 16 inches (135mm)