The sense of Sight is generally conceded to be the highest and most complex of all the senses of Man. It deals with a far larger number of objects–at longer distances–and gives a far greater variety of reports to the mind than any of its associate senses. It is the sense of Touch magnified many times.
As Wilson says of it, “Our sight may be considered as a more delicate and diffusive kind of touch that spreads itself over an infinite number of bodies; comprehends the largest figures, and brings into our reach some of the most remote parts of the universe.”
The sense of Sight receives its impressions from the outside world by means of waves that travel from body to body–from sun to earth, and from lamp to eye. These waves of light arise from vibrations in substance, of an almost incredible degree of rapidity. The lowest light vibration is about 450,000,000,000,000 per second, while the highest is about 750,000,000,000,000 per second.
These figures deal only with the vibrations recognizable by the eye as light. Above and below these figures of the scale are countless other degrees invisible to the eye, although some of them may be recorded by instruments. The different sensations of color, depend upon the rate of the vibrations, red being the limit of the lowest, and violet the limit of the highest visible vibrations–orange, yellow, green, blue, and indigo being the intermediate rates or colors.
The cultivation of the sense of Sight, under the aid of Attention is most important to ail persons. By being able to clearly see and distinguish the parts of an object, a degree of knowledge regarding it is obtained that one may not acquire without the said exercise of the faculty. We have spoken of this under the subject of Attention, in a previous lesson, to which lesson we again refer the student. The fixing of the eye upon an object has the power of concentrating the thoughts and preventing them from wandering. The eye has other properties and qualities that will be dwelt upon in future lessons. It has other uses than seeing. The influence of the eye is a marvelous thing, and may be cultivated and developed.