Diseases and injuries of the eye : with their medical and surgical treatment / by George Lawson.

  • Lawson, George, 1831-1903.
Date:
1903
Catalogue details

Licence: Public Domain Mark

Credit: Diseases and injuries of the eye : with their medical and surgical treatment / by George Lawson. Source: Wellcome Collection.

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    CONTENTS. CHAPTER I. ELEMENTARY OPTICS. PAGE Light paths—General laws of refraction and lenses—Lenses—General laws governing all lenses—Biconvex lenses and their images—Biconcave lenses and their images— Cylindrical lenses—General laws of reflection and mirrors—Plane mirrors and their images—Spherical mirrors—Images formed by concave mirrors—Images formed by convex mirrors ...... i — io CHAPTER IL GENERAL PRINCIPLES OF OCULAR REFRACTION. Static refraction—Dynamic refraction—Emmetropia—Ametropia—Hypermetropia— Myopia—The retinal image—Projection of the retinal image—Size of the retinal image—The visual angle—Fixation—Angle gamma and angle alpha—Accommo¬ dation—Helmholtz’s theory of accommodation—Tscherning’s theory of accommo¬ dation— Proof of the increased convexity of the lens in the pupillary area during accommodation—Measurement of accommodation—Punctum remotum — Punctum proximum^Relationship between accommodation and convergence — Metrical or dioptrical system of numbering lenses . ..... n—21 CHAPTER III. THE METHODICAL EXAMINATION OF THE EYE. I. External examination—Eyelids—Size of the globe—Proptosis or exophthalmos— Tension—Conjunctiva—The cornea—The iris — The pupils — The sclerotic— Motility—Vision and malingering—Diplopia—Polyopia—II. Subjective exami¬ nation—Test types—Snellen’s types—III. Oblique or focal illumination— IV. The ophthalmoscope—-Couper’s—Morton’s—Special advantages of indirect examination — Special advantages afforded by direct examination—How to use the ophthalmoscope—Preliminaries to examination—Indirect method—Direct method —Estimation of the refraction—Measurement of elevations and depressions— Examination of the refracting media—The normal fundus—Optic disc—Physio¬ logical cup—Macula lutea—Tesselated fundus—V. The field of vision—Peri¬ meter—Fixation point—Field of binocular vision—Scotomata—Peripheral con¬ tractions—Field of central fixation—VI. Colour vision—Physiological defects— Pathological defects ...... 22—50