Observations on the nature and theory of vision : with an inquiry into the cause of the single appearance of objects seen by both eyes / by John Crisp, F.R.S.
- Crisp, John
- Date:
- MDCCXCVI [1796]
Licence: Public Domain Mark
Credit: Observations on the nature and theory of vision : with an inquiry into the cause of the single appearance of objects seen by both eyes / by John Crisp, F.R.S. Source: Wellcome Collection.
Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.
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![[76 ] now ftated, the queftion itfelf vanilKcs; for it implies what is not a fad:, namely, that the external objedls are feen, and not the images ; but the truth is, that the images; are not inverted, for the objecSs we fee are ered;, and thefe, i* has been fliewn, are the images. There is a folution of the above quef- tion by Dr. Reid, on which I fliall make a few remarks, becaufe the author draws from it a conclufion which I conceive to be altogether inconfiflent with the nature of vi- lion; which is this: '* that if the projections ** on the retina had been the reverfe of what 1* they now are, the mind would have feen ** all objects in an inverted pofition. This author has laid it down as a law of nature in vifion, that we fee objedls in the direc- tion of a line paffing from, the pidure on the retina through the centre of the eye ; and by this law of nature he folves the queftion; fince the lines thus paffing from the](https://iiif.wellcomecollection.org/image/b21175408_0098.jp2/full/800%2C/0/default.jpg)
