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An optical device with variable astigmatic power.

J P Foley1, C Campbell

  • 1Humphrey Systems, Dublin, California, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 25, 1999
PubMed
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A novel variable power cross-cylinder lens set uses identical elements, unlike the Stokes set. This design allows for adjustable spherical bias or offset, offering greater flexibility in optical applications.

Area of Science:

  • Optical engineering
  • Ophthalmic optics

Background:

  • Traditional Stokes variable power cross-cylinder lens sets utilize paired, opposing cylindrical lenses.
  • Existing lens sets have limitations in flexibility and adaptability for specific optical adjustments.

Purpose of the Study:

  • To introduce a new variable power cross-cylinder lens set with enhanced design flexibility.
  • To demonstrate the capability of the new lens set to achieve effects similar to Stokes sets or introduce spherical bias.

Main Methods:

  • Description of a novel variable power cross-cylinder lens set employing identical lens elements.
  • Analysis of the lens set's optical function using three-dimensional refractive space principles.
  • Design considerations for sphero-cylindrical elements to achieve desired optical outcomes.

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Main Results:

  • The new lens set comprises identical sphero-cylindrical elements, offering versatility.
  • The design enables the creation of a desired spherical bias or offset.
  • The system can replicate the functionality of a Stokes lens set when required.

Conclusions:

  • The developed variable power cross-cylinder lens set provides a flexible alternative to existing designs.
  • Its unique configuration with identical elements allows for precise control over spherical bias.
  • This innovation has potential applications in various optical and ophthalmic fields.