Up to grade 2 of keratoconus, contact lenses will most likely provide better visual performances than a pair of glasses. Standard or modified lens geometry can be manufactured depending on the patient’s corneal topography. Apical touch and the problems associated with that will be avoided by using the FlexCone lens. The question of whether a well formed contact lens can slow down or even stop the progression of keratoconus is a controversial one even amongst the professional community. The prime objective when fitting the lens is therefore not healing but improving image clarity thus improving overall vision. Once the lens is removed from the eye the vision will return to its original level.
Due to advanced materials and designs today’s contact lenses offer excellent long term performance in terms of corneal oxygen supply. Feelings of dryness have been reduced and toleration of wear have been improved even when tear conditions are less than ideal.
Contact lenses are easy to use and clean and can offer visual stability for many eye conditions (e.g., corneal curvature, keratoconus, after corneal transplant). Longer modality is not a problem provided the simple care regime is adhered to.
It is recommended to replace a “FlexCone” after 12-months of wearing. Very careful handling can mean the wearing time can be extended up to 18 months which will mean a price advantage compared to more frequently replaced lenses
Fitting “FlexCone” is very straightforward and time-efficient.
The use of fitting lenses is generally recommended.
Grades 1 or 2 keratoconus, or a topography > 6.5 mm use “HydroConeK12” as initial fitting lens
Grades 3 or 4 keratoconus and/or a topography < 6.5 mm use the “FlexConeK34” as initial fitting lens
Increase the diameter according to the off-centering of the cone
If the lens is too flat or too steep adjust r0 to compensate
If the “K12” should sit peripherally too steep, then switch to “K34” with constant r0.
If the “K34” should sit peripherally too flat, then switch to “K12” with unaltered r0.
If the back-surface geometry does not show satisfactory fitting behavior, or a special topography is required, the back surface can be individually parameterized with the “Orbiflex SxS”.
Back surface geometry: Central, spherical optical zone,3 peripheral curves, spherical flattening
Front surface: Spherical optic zone, or Bifocal (BF) / simple progressive (SP)
Base curve: 6.00 mm up to 9.00 mm
Diameter: 7.50 mm to 12.00 mm
Sphere: +/-40.00 dpt.
Addition: + 0.50 to + 4.00 dpt.
Back surface flattening: strong at onset keratoconus (K12), very strong in advanced keratoconus (K34)
If the back-surface geometry does not show satisfactory fitting behavior, or a special topography is required, the back surface can be individually parameterized via the “Orbiflex SxS
Standard parameters can be modified after consultation our professional service team.