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.

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When to use

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

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Parameters

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

 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