Contributions to the comparative anatomy of the mammalian eye : chiefly based on ophthalmic examination / by George Lindsay Johnson.

  • Johnson, G. Lindsay (George Lindsay), 1853-1943.
Date:
[1900]
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Credit: Contributions to the comparative anatomy of the mammalian eye : chiefly based on ophthalmic examination / by George Lindsay Johnson. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    PHILOSOPHICAL TRANSACTIONS. I. Contributions to the Comparative Anatomy of the Mammalian Eye, chiefly based on Ophthalmoscopic Examination. By George Lindsay Johnson, M.I)., F.R.C.S. Communicated by H. Gadow, F.R.S. Received May 2 —Bead May 17, 1900. (Plates 1-30.) Contents. Fage Summary .... 1 Introduction 7 Part I. Special descriptive part, recording observations as to the appearance of the Fundus oeuli by means of the ophthalmoscope in 182 species of Mammals examined. These fall under 103 genera and 47 families, comprising nine out of the eleven natural orders, the Cetacea and Sirenia being omitted. Observations as to the refraction of these animals, the divergence of their optic axes, peculiarities of their irides, pupils, and other features are likewise described 9 PART II. Divided into eleven chapters, viz. :— Chap. I.—The Colour of the Fundus oculi and the Tapetum lucidum 36 „ II.—Vascularisation of the Retina 42 ,, III.—Reversions of Type and Vestigial Relics 49 ,, IV.—Shape and Colour of the Optic Disc 57 V.—Shape of the Pupil 58 ,, VI.—-Divergence of the Optic Axes 60 „ VII.—Refraction 61 „ VIII.—Binocular Vision 62 ,, IX.—Physiological Considerations 65 ,, X.—Influence of Domestication 66 „ XI.—The Ophthalmoscopic Appearance of the Fundus oculi as bearing on Classification . 67 Summary of Conclusions. The colour of the Fundus oculi in animals devoid of a tapetum is mainly determined by reflection from the choroidal pigment. In animals possessing a Tapetum cellulosum (Carnivores), the colour of the fundus is mainly determined by the colour of the retinal pigment. In animals which have a Tapetum librosum (Ungulates), the colour VOL. CXCIV.—B 194. B 20.7.1901.