5 Key Takeaways

• 1

  Successful first fits in orthokeratology depend on understanding technology and metrics, not luck.

• 2

  Corneas with an eccentricity value of 0.50 or higher may achieve greater refractive changes with ortho-k lenses.

• 3

  Visual iris diameter is crucial for determining the sagittal depth of ortho-k lenses, affecting centration.

• 4

  Corneal elevation differences greater than 25 µm may necessitate toric peripheral curves for optimal fitting.

• 5

  Clinicians should utilize topographer data and consult with design experts to enhance first-fit success rates.