An impartial inquiry into the seat of the immediate organ of sight. Viz. whether the retina or choroïdes. Being the subject of a lecture, in a course lately given on the nature and cure of the diseases of the eye ... / [John Taylor].

  • Taylor, John, 1703-1772
Date:
1743
Catalogue details

Licence: Public Domain Mark

Credit: An impartial inquiry into the seat of the immediate organ of sight. Viz. whether the retina or choroïdes. Being the subject of a lecture, in a course lately given on the nature and cure of the diseases of the eye ... / [John Taylor]. Source: Wellcome Collection.

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    ’ ( IS ) Degree of Light greater than the ordinary Degree j together with that painful Senfa- tion which attends any Degree of Light fal¬ ling fuddenly upon the Eye, greater than the ordinary Degree 5 and that painful Senfa- tion (which is much the fame) which affeds the Eye going out of an obfcure Place fuddenly into great Light, may be ealily accounted for, by con'fidering that tho’ we do allow the Retina to be fo fuffi- ciently opaque, as to make that Refiftance to every Point of the Objed: which is necef- fary to receive its Impreffions; yet not fo as to hinder the Light from affedting the Cho- '■o'ides, and thus the Nerves of the Choroides night be fo affedted with the Aflion of ^ight, as to communicate its Effeds to the ixtremities of the fame Nerves in the Iris. fhus when the Light does fall in a greater J)egree than in the ordinary Degree, as there alls a greater Quantity on the Retina, fo here falls a greater C^antity on the Cko~ o'ides, and according to its entring more or :fs fuddenly, the Senlation muft be propor- lonable,^ and thus the Extremities of thofe ^erves in the Iris mull fuffer with thofe arts of the Choroides from whence they are pntinued ; and in like Manner when it en- !rs in a lelTer Quantity, there mufl be a roportionable Lois of that Senlation which ley received in the ordinary Degree of 'ght j and thus thele Extremities of the Iris