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Monthly Newsletter
July 2024
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SPOTLIGHT ON EDUCATION: GP Spherical and Toric Lens Design, Fitting, and Problem-Solving

Presented by Dr. Ed Bennett in July 2024

This webinar presentation emphasized the basics as it pertains to GP lens materials, and spherical and toric corneal GP lens designs, fitting, evaluation, and problem-solving. This included the following:

GP lens materials, coatings, and material selection

Optimizing GP initial comfort

12 important spherical lens design factors and how to determine them in empirically fitting a specified patient:

  • Overall/Optical Zone Diameter
  • Base Curve Radius
  • Fluorescein Pattern Evaluation
  • Base Curve/Cornea Relationship with diameter change
  • Peripheral Curve Design
  • Center Thickness
  • Edge Design
  • Lenticular Design
  • Make Lens Design Changes Significant
  • Lens Movement
  • Lens Power
  • Lens Storage/Disinfection

Problem-Solving

  • Inferior Decentration
  • Corneal Desiccation
  • Poor Surface Wettability

GPs and High Astigmatism

  • Why to Use a Bitoric (versus back toric) Lens Design
  • Spherical Power Effect Versus Cylinder Power Effect Bitoric Designs
  • Empirical Fitting of Bitoric Lenses
    • Mandell-Moore Guide
    • GPLI Toric and Spherical Lens Calculator
    • Newman Contact Lens Guide
  • Diagnostic Fitting
  • Other Lens Design Considerations

Toric and Spherical Lens Resources

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