Trans-limbal fitting for higher prescriptions
Larger lenses for more correction and steadier centring.
Higher prescriptions ask more of the lens
Part 05 · 01- 01
More correction, more reshaping
Higher myopia needs a deeper tear reservoir and a more demanding lens design.
- 02
Small lenses can ride off-centre
On a higher correction, a standard-diameter lens is more likely to decentre.
- 03
Off-centre treatment costs quality
Decentring causes glare, halos and uneven vision, especially at night.
What trans-limbal fitting changes
Part 05 · 02A larger lens
The lens extends past the limbus, where the clear cornea meets the white of the eye.
Landing beyond the cornea
Resting partly on the tissue past the limbus spreads the load and keeps the lens centred.
A steadier treatment zone
Better centring gives a more even corrected area.
Designed from your map
Diameter and landing are set from corneal and limbal topography, not guesswork.
Who it may suit
Part 05 · 03Higher myopia
When the target correction is beyond what standard designs centre well.
Previous decentred results
If an earlier ortho-K lens rode off-centre.
Astigmatism to the limbus
When corneal toricity extends to the edge of the cornea.
There are limits. For some very high prescriptions, daytime specialty lenses may be the better choice. We’ll tell you honestly.
In summary
Part 05- 01Higher prescriptions need more reshaping and better centring.
- 02Trans-limbal lenses are larger and land beyond the cornea.
- 03The aim is a steady, centred treatment zone and clearer vision.
Book an ortho-K assessment.
We map your cornea first, then design the lens around it.
General information only, not personal advice. Suitability for ortho-K is decided after a full eye examination and corneal mapping.