On the means employed for correcting the inverted image on the retina of the eye / by Joseph Swan.

  • Joseph Swan
Date:
1865
Catalogue details

Licence: Public Domain Mark

Credit: On the means employed for correcting the inverted image on the retina of the eye / by Joseph Swan. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    an extended investigation of the functions of the nervous system, and more particularly whilst the sensitive division was under consideration. As the existence of any decided crossing in the sensitive centres and nerves is equivocal, it became necessary to determme whether the crossing of the optic nerves is part of a principle relating to sensitive nerves, or whether it is attributable to the accordance and compensation required by changes for carrying out the physical laws of optics. As far as the correction of the inverted image is concerned the inquiry is both curious and interesting, but it becomes of much more general importance by the consideration of the very large proportion of the sensitive centres and nerves thereby left undetermined; for if the optic nerves cross according to physical laws, this occurrence need not be esteemed as part of the necessary economy in relation to the remaining extensive section comprehending the special senses and common sensation. Such a determination would set free all the other sensitive functions, and allow them to be carried out under a law of their own. In the following pages the plan for correcting both the upright and lateral inversion of the image
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