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Related Experiment Videos

Determining exact prismatic deviations in spectacle corrections.

A Remole1

  • 1School of Optometry, University of Waterloo, Ontario, Canada. aremole@sciborg.uwaterloo.ca

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 24, 1999
PubMed
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Prentice's rule is inaccurate for modern spectacles, especially with thick lenses or complex corrections. New methods accurately calculate prismatic effects using spectacle images and ocular rotation centers.

Area of Science:

  • Optometry
  • Ophthalmic Optics
  • Visual Optics

Background:

  • Prentice's rule has been a long-standing method for calculating prismatic effects in spectacle lenses.
  • Its validity is limited to thin lens approximations and single lenses.
  • Current applications do not account for lens thickness or base curves, leading to inaccuracies.

Purpose of the Study:

  • To evaluate the limitations of Prentice's rule in modern ophthalmic optics.
  • To demonstrate the inaccuracies arising from its application to thick lenses and binocular vision.
  • To present a novel method for precise prismatic effect determination.

Main Methods:

  • Analysis of Prentice's rule under conditions considering lens center thickness and base curves.
  • Evaluation of assumptions regarding eye position relative to optical centers in binocular vision.

Related Experiment Videos

  • Development and application of a method using spectacle-generated images and ocular rotation centers.

    • Main Results:

    • Prentice's rule is shown to be invalid when lens center thickness and base curves are considered.
    • The assumption of identical viewing distances from optical centers for both eyes leads to compounded errors.
    • The rule is unsuitable for calculating differential prismatic effects in iseikonic corrections.
    • A new method provides exact prismatic effect determination.

    Conclusions:

    • Prentice's rule is an oversimplified approximation for contemporary spectacle lenses.
    • Accurate prismatic effect calculation requires considering lens geometry and binocular viewing conditions.
    • The proposed method offers a more precise approach for ophthalmic lens analysis.