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Related Experiment Videos

The term magnification.

George C Woo1, Andrew Mah-Leung

  • 1Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

Clinical & Experimental Optometry
|October 9, 2002
PubMed
Summary
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This paper clarifies magnification principles in low vision, defining terms like relative size, distance, and angular magnification. It explains apparent magnification, common formulas, and iso-accommodative magnification for better optical system understanding.

Area of Science:

  • Ophthalmology
  • Optics
  • Low Vision Rehabilitation

Background:

  • Magnification terminology in low vision literature is often inconsistent.
  • Understanding basic magnification principles is crucial for effective low vision device selection.

Purpose of the Study:

  • To clarify fundamental magnification principles used in low vision.
  • To define and differentiate various magnification terms and concepts.

Main Methods:

  • Review and clarification of established magnification principles.
  • Description of commonly used magnification terms and formulas.
  • Introduction to equivalent viewing power (EVP) and equivalent viewing distance (EVD).

Main Results:

Related Experiment Videos

  • Distinction between relative size, relative distance, and angular magnification.
  • Explanation of apparent magnification, M=F/4, M=F/2.5, and iso-accommodative magnification.
  • EVP and EVD are presented as alternative metrics for optical system resolution.

    • Conclusions:

    • A clear understanding of magnification types enhances low vision aid selection.
    • EVP and EVD offer an intrinsic measure of an optical system's performance.
    • Standardized terminology is essential for effective communication in low vision research and practice.