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A computer-interfaced vertometer system for contact lenses

M Collins1, A Goode, B Davis

  • 1Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia. m.collins@qut.edu.au

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|January 1, 1997
PubMed
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A new computer-based vertometer accurately measures back vertex power (BVP) variations in multifocal contact lenses. This system enhances resolution and precision for both rigid and soft lens types.

Area of Science:

  • Ophthalmic optics
  • Contact lens technology

Background:

  • Conventional vertometers struggle with accurate back vertex power (BVP) measurement for contact lenses with variable optic zones.
  • Previous methods for multifocal lens BVP measurement used standard vertometers with the Scheiner principle.

Purpose of the Study:

  • To develop a computer-based vertometer system for precise BVP profiling of contact lenses.
  • To overcome limitations of conventional vertometers in measuring complex lens designs.

Main Methods:

  • Developed a computer-based vertometer system utilizing the Scheiner principle.
  • Integrated a computer interface for rapid data acquisition.
  • Employed software-based ray tracing to determine in-air dioptric power across the optic zone.

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Main Results:

  • Successfully generated BVP profiles for soft and rigid contact lenses.
  • Included spherical and aspheric surface lens results.
  • Demonstrated the system's capability to measure power variations across the optic zone.

Conclusions:

  • The developed system significantly improves measurement resolution compared to standard vertometers.
  • The system exhibits acceptable precision and accuracy for most contact lens measurement applications.
  • Offers a more advanced tool for analyzing multifocal and complex contact lens designs.