A physiological approach based on the author's recent work is described using a thermo-dynamic and ultra-microscopic comparison at the posterior-endocular level. Results of preliminary research into the spectral composition of illumination applied to miniaturised objects requiring excessive visual strain are also discussed. The paper examines the reversible choreo-retinal-vitreous positional structural modifications in terms of spectral luminances, demonstrating that the mechanism operates as a high pressure generator directed by the level of illumination, causing a potential modification of the pigmentary epithelium. Detailed explanations are given, with diagrams, of the vaso-motor action which causes the setting up of pressure gradients. An explanation of nocturnal myopia is that receptor areas can be modified positionally under the influence of light by the reflection towards the rear of the area where photocopic reception occurs during nocturnal vision or feeble illumination. The paper was originally published in French in the Proceedings of the First International Congress on Vision and Road Safety, Paris, 1975-02. (TRRL)

  • Corporate Authors:

    Transport and Road Research Laboratory (TRRL)

    Wokingham, Berkshire  United Kingdom 
  • Authors:
    • Calvet, H
  • Publication Date: 1979

Media Info

  • Features: Figures; References;
  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00322064
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: TRRL 2806 Monograph
  • Files: ITRD, TRIS
  • Created Date: Jan 19 1981 12:00AM