Observations and cases relating to the operation for artificial pupil; in a letter from Mr. Maunoir of Geneva, to Professor Scarpa of Pavia, with the professor's answer / communicated by Dr. Marcet.

  • Marcet, Alexander, 1770-1822.
Date:
[1816]
Catalogue details

Licence: Public Domain Mark

Credit: Observations and cases relating to the operation for artificial pupil; in a letter from Mr. Maunoir of Geneva, to Professor Scarpa of Pavia, with the professor's answer / communicated by Dr. Marcet. 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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    ( 124 ) of the eyes, than if the optic axes met there, as in naked vifion ; and if myopic, with a iefs. It is alfo worthy of remark, that this advantage does not ultimately tend to increafe the evil, which firft gives occafion for fpeaacles. On the contrary, if what every writer upon vifion afferts be true, that we are apt to become fhort or long- iighted, according as we are much accuf- tomed to view near or diflant objeds, it rnufl ferve to diminifh that evil. In fupport of this opinion, I ihall mention a fad:, with which I have been made acquainted by Mr. George Adams,* of this place, who is not only well fkilled in the theory of vifion, but, from his fituation, as an artift, has better opportunities, than moft perfons, of learning luch matters. The faft is this, that he does not know a fhort-fighted perfon, who has had occafion to increafe '' the depth of his glalTcs^ if he began to ufe them in the form of fpedlacles ; whereas he can recoiled: feveral inftances, where thofe have been obliged to change their concave * Mathematical Inftrument Maker to the King.