Wednesday, May 15th - ORTHOTOOL™ WORKSHOP

From Complexity to Simplicity

Wednesday, May 15th 4:00 pm - 8:00 pm

Sharing over 35 years of research and practical experience, this workshop will feature all the basic and advanced principles in design formats for effective orthokeratology in myopia management (US patent).

*This workshop is designed for beginners & advanced fitters.
You must be registered for Wednesday to attend this workshop.

Presenter: Eddie Chow, OD, FIAOMC


Topographer data analysis to optimize OrthoTool ™ lens designs

  • What can be done with CUSTOM design using your topographer

  • How to input data from your topographer into OrthoTool™ for lens design

  • Analyzing data for optimal results

Corneal biomechanics as applied to orthokeratology

  • Hysteresis: viscosity & damping

  • Elasticity

  • Resistance factor: central corneal thickness

  • Biomechanics as related to age and ethnicity

  • Design format with the implication of corneal biomechanics

Effective modern orthokeratology for successful ortho-k & myopia control

  • Understanding the peripheral defocus theory

  • The optics of ortho-k

  • Corneal tissue movement/migration in ortho-k

  • Munnerlyn Formula: related to tissue migration/movement and treatment zone to benefit treatment

  • Jessen Factor: how much to target?

  • The difference between proprietary & custom design for effective results

Understanding the forces applied in ortho-k & guided principles for lens design (tear film diagrams to illustrate the force concept)

  • Compression force

  • Squeeze film & tension forces

  • Surface tension, small capillary forces

  • Aspheric back optical zone to generate extra forces & control of sagittal height of fit

  • General theories for successful results: understanding the basic concepts & the functions of different curves & why CUSTOM design allows for better myopia control

  • Learning to identify the fluorescein patterns for effective results

Introduction of OrthoTool ™ (new upgrades with 10 curves)

  • Why the new software is superior for lens design & myopia control

  • The difference between proprietary & CUSTOM lens designs

  • Pushing the limits of conventional lens design

  • Learn how to design regular & multifocal SOFT & GP lenses (for myopia control)

  • Learn how to design reverse geometry lens for myopia, hyperopia, presbyopia & post surgical corneas

  • Guided principles for lens design

Trouble Shooting

Case presentation