The Principles and Practice of Ophthalmic Surgery, Comprising the Anatomy, Physiology and Pathology of the Eye, by B. Travers and J.H. Green, Ed. [Really Compiled from Various Sources] by A.C. Lee
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Home > Art, Film & Photography > The Principles and Practice of Ophthalmic Surgery, Comprising the Anatomy, Physiology and Pathology of the Eye, by B. Travers and J.H. Green, Ed. [Really Compiled from Various Sources] by A.C. Lee
The Principles and Practice of Ophthalmic Surgery, Comprising the Anatomy, Physiology and Pathology of the Eye, by B. Travers and J.H. Green, Ed. [Really Compiled from Various Sources] by A.C. Lee

The Principles and Practice of Ophthalmic Surgery, Comprising the Anatomy, Physiology and Pathology of the Eye, by B. Travers and J.H. Green, Ed. [Really Compiled from Various Sources] by A.C. Lee


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1839. Excerpt: ... wards. Through this law of visual direction, the inverted image on the retina is seen in the opposite or correct position. Now the retina is to be used in giving us notions of the visual directions of objects, which are to correspond exactly with the notions that we derive from the sense of touch. Accordingly, we find placed before the retina a series of media, the effect of which is to produce true vision by means of the law of visual direction above mentioned: these are the refracting media, which have been already mentioned. ABERRATION OF LIGHT FROM UNEQUAL REFRACTION. In speaking of the refraction of rays at the surfaces of spheres and lenses, we have supposed that all the rays meet exactly in the focus. This, however, is not strictly the case; for if rays, falling on the surface of a sphere at a particular point, are collected to a focal point beyond this lens, other rays falling on the surface of the lens nearer to the axis, will have their focus at a point farther from the sphere than the former. This is easily proved by actually projecting the refracted rays, and if it is done for those rays farthest from the axis, and for those nearest to the axis, the difference between the foci of these rays is called the spherical aberration, or the aberration or straying of the rays from the focus, caused by the spherical figure of the lens. This aberration arises from the curvature of the lens being equally spherical, for if the surface of the lens was more convex towards the axis, the focal distance of rays falling on that part would be diminished, and consequently would be less. Hence, in order to refract rays at different distances from the axis to the same point, the surfaces of the lens must have different degrees of curvature at different distances fro...


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Product Details
  • ISBN-13: 9781150938740
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1150938749
  • Publisher Date: 05 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr


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The Principles and Practice of Ophthalmic Surgery, Comprising the Anatomy, Physiology and Pathology of the Eye, by B. Travers and J.H. Green, Ed. [Really Compiled from Various Sources] by A.C. Lee
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