Wednesday, May 15th - ORTHOTOOL™ Workshop

From Complexity to Simplicity

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

(2-Hours of Continuing Education)

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

4:00 PM - 6:00 PM Orthokeratology for Myopia Control - Understanding the True Optics Biomechanical Properties: A Practitioners Clinical View This course will look at understanding the true corneal profile for the proper fit of reverse geometry lenses as well as the forces acting on the cornea and the lens.

6:00 PM - 8:00 PM Workshop Continued


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