Dyna Intra-limbal

From - £65.70

The DIL has been specifically designed for Pellucid Marginal Degeneration, Globus Keratoconus, Post Penetrating Keratoplasty, Tilted Grafts and other conditions not served well by traditional speciality cone designs.


When to use

  • For patients with irregular corneas, where traditional cone designs have been unsuccessful or are not an option



Materials:Optimum Extra / Boston XO
Base curve5.90 to 9.40mm
Average thickness0.18mm on all powers
Diameter10.80 to 12.00mm
BVP-25.00 to + 25.00D

Fitting Guide

Aim and ideal fit
  • The principles used in fitting all corneal conditions are the same. The fluorescein fit, however, will appear different depending on the condition
The ideal fit will have
  • A fluorescein pattern as close to alignment as possible
  • A light feather touch at the apex of the steepened area
  • 0.5 to 1mm of movement
Trial lens selection

Manual keratometer fitting:

  • The first trial lens has a base curve closest to 0.2mm flatter than the median K reading

Topography Fitting:

  • Start with a trial lens that is close to the measurement at the temporal 4-5mm position 

 Diameter selection:

  • The standard DIL diameter is 11.2mm. The overall diameter needs to be at least 0.2mm smaller than the cornea

Edge Profile:

  • The desired edge lift will show 0.2mm of clearance. The DIL system starts with a standard edge lift. Flatter or steeper edge lifts are available in a step system
  • Ensure that you have a good central fit first and then consider the edge fit
  • If edge clearance is too low then order a lens with a step 2 flat edge profile
  • If edge clearance is too high then order a lens with a step 2 steep edge profile
  • Increase or decrease the number of steps in 2 step increments as needed to achieve the desired 0.2mm of edge clearance. Use the intermediate step increments for fine tuning if needed