Word: visualizations
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...merely the movement of the matador's cape. Dog lovers will continue to protest the thought that their pets live in a colorless grey world.* But Biologist Walls outlines a hypothesis of color vision new to the layman. The ability to see colors Dr. Walls links directly to visual acuity-the ability to see well. He points out that the vertebrates with the greatest color vision (bony fishes, reptiles and birds, monkeys, apes and man) are those with the greatest visual acuity-and those most active in the daytime. "It is no accident," says he, that diurnality...
Cones & Rods. The retina (the screen upon which the lens of the eye casts the image) has two kinds of visual cells: cones, each with its direct line to the brain; rods connected in multiple to the optic nerve fibers. The cones give sharp, color vision, work in bright light only. The rods "gang up" faint and dim impressions in weak light, catch no color. Some animals have cones but apparently no color vision; no known color-seeing animals have rod cells alone...
Sharp vision and color vision have two other common denominators. One is a highly sensitive dimplelike spot on the retina (the fovea centralis-literally, "central pit"), which acts as a magnifying device to spread the image over a greater number of visual cells. In this dimple, common to the vertebrates with the highest acuity (some birds have two in each eye), there are no rod cells. The cones are slim and tight-packed. The other common denominator is the mechanism for accommodation-ability to focus the eye, maintain a sharp image of a moving object...
...movies are innocently the most revolutionary instrument that has come from America since the Declaration of Independence. . . . The United States is now associated all over Europe (and above all in Britain) with a series of visual images that the European peoples find attractive. America is a background to the movies...
...civilians who wish to enter the V-12 program, but are not enlisted in V-1, V-5 or V-7, the qualifications are as follows; male citizen of the United States, morally, and physically fit, with minimum visual acuity of 18/20 unmarried and agree to remain so until commissioned, and evidence potential officer qualifications, including appearance and scholarship records...