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The NAP prism.

G Smith1, A W Johnston, J D Maddocks

  • 1Department of Optometry, University of Melbourne, Parkville, Victoria, Australia.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 1, 1990
PubMed
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The NAP prism deflects light by 90 degrees, maintaining an erect image. Zero color fringing is possible but limits the field of view, while tolerating some fringing allows a wider view.

Area of Science:

  • Optics
  • Optical Engineering

Background:

  • The NAP prism, commercially available in "NAP glasses," is designed for image erection and beam deflection.
  • It functions through a combination of reflection and refraction, which can introduce chromatic aberration (color fringing).

Purpose of the Study:

  • To analyze the optical properties of the NAP prism.
  • To determine the conditions for achieving zero color fringing and its impact on the angle of deviation.
  • To investigate the relationship between prism apex angles, beam deviation, and field of view.

Main Methods:

  • Theoretical analysis of light ray paths through the prism.
  • Calculation of the angle of deviation under specific conditions.
  • Investigation of the effects of varying prism apex angles.

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Main Results:

  • The NAP prism deflects a beam by approximately 90 degrees while preserving image orientation.
  • Zero color fringing necessitates a specific prism configuration, resulting in a limited field of view.
  • Allowing for some color fringing significantly expands the achievable field of view.

Conclusions:

  • The design of the NAP prism involves a trade-off between chromatic aberration and field of view.
  • Optimizing the prism apex angle is crucial for balancing optical performance characteristics.
  • The study provides insights into the optical behavior of commercial prisms for specific imaging applications.