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This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough...

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Excerpt from The Refractive and Motor Mechanism of the EyeColon - It can be shown with the aid of a prism, which causes a separation of waves according to their period of oscilla tion, that sunlight is composed of a number of waves of varying periodicity and wave-length (the latter being inversely proportional to the former), and that other waves also accompany the various waves of light. Certain waves whose vibratory period is too rapid to af...

Excerpt from The Refractive and Motor Mechanism of the EyeThe mathematical formulae dealing With the theory of refraction have been abridged to the greatest extent compatible With a proper understanding of this funda mental branch of Ophthalmology. The student Who is disinclined to follow the demonstrations may learn only the conclusions reached he may then read the other parts of the book as intelligently as if the demonstrations had been omi...

Excerpt from Handbook of Optics: For Students of OphthalmologyThe question as to the method of transmission of light has been the subject of much controversy. Leaving aside the speculations of the ancients, the two theories are the Corpuscular or Emission The ory and the Wave Theory. The first supposes a luminous body to give off certain particles, which, striking the eye, produce vision. The wave theory supposes that all space is pervaded by ...

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Excerpt from The Refractive and Motor Mechanism of the EyeColon - It can be shown with the aid of a prism, which causes a separation of waves according to their period of oscilla tion, that sunlight is composed of a number of waves of varying periodicity and wave-length (the latter being inversely proportional to the former), and that other waves also accompany the various waves of light. Certain waves whose vibratory period is too rapid to af...

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Excerpt from Handbook of Optics: For Students of Ophthalmology In the following work there is presented so much of the science of optics as pertains directly to ophthalmology. Simplicity has been sought so far as this is not incompatible with thoroughness, for whoever would become versed in ophthalmology as a science must in the beginning make the mental effort necessary to acquire a clear understanding of the refraction of light through a co...

Excerpt from The Refractive and Motor Mechanism of the Eye Vision is the sense which reveals to us the form and color of objects by the action of light on the retina, in other words, vision may be defined as the consciousness which results from the stimulation of the retina by light. The visual apparatus consists of two distinct parts. The first of these is the eye, which is analogous to a photograph camera. The retina, which receives and tr...

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