Hybrid contact lens

HydroFlex hybrid contact lens are next generation hybrid contact lenses that consist of :

  • a central zone made of a high Dk RGP material, for excellent vision
  • a soft peripheral skirt made of a Silicone Hydrogel material, for easy fitting and comfort

EyeBrid_Silicone_scheme

The hybrid contact lens HydroFlex is available in different geometries:

HydroFlex

  • spherical back surface with aspherical flattening
  • Uni- or multifocal with spherical optical zone on the front surface

HydroFlex-Bi

  • toric back surface with aspherical flattening
  • Uni or multifocal with torical optical zone on the front surface
  • Ballast stabilisation

HydroFlex-ext

  • spherical back surface with aspherical flattening
  • Uni- or multifocal with toric optical zone on the front surface
  • Multi-dynamic stabilisation

HydroFlex-int

  • toric back surface with aspherical flattening
  • Uni- or multifocal with spherical optical zone on the front surface
  • Ballast stabilisation

The skirt and center are modifiable. It is important to note that the fitting of the skirt is totally independent of the central zone and does not have any influence on the vision.

The skirt should be perfectly aligned with the conjunctiva.

Flattening of the soft skirt

The soft peripheral skirt can be adjusted to improve the fitting concerning centration and mobility. 4 different skirt are available.

skirt

Multifocal design:

Simple Progressive (Sp): concentric spheric/aspheric central zone. With distance (CD) or with near in center (CN).

Technical data

  • Total diameter: 14.90 mm and 15.50
  • Base curve: 5.50 to 10.00 mm
  • Sphere: -40.00 to + 40.00 dpt
  • Cylinder: -0.50 to -6.00 dpt
  • Axis: 0° to 180°
  • Addition: +0.75 to +3.00 dpt

Indications of hybrid contact lenses are:

  • Wearers of RGP lenses having problems relating to comfort, centration or stability
  • Keratoconus and other corneal irregularities, including highly complex irregular corneas
  • All astigmatisms that can potentially be fitted with RGPs
  • All high ametropias
  • Wearers of Piggyback lenses
  • Unilateral or occasional wear

First fitting

  • Total diameter: = 14.90 mm
  • Basiskurve = flattest K reading or base curve of “RGP-trial lens” (recommended)
  • Power: eyeglasses sphere (Vertex power = 0)
  • Addition: Addition of glasses
  • Zoc, position: dominant eye CD, non-dominant eye CN
  • Flattening: first try with J = 0,0

Assess the fit

Control visual acuity:

If visual acuity is insufficient, perform a spherical over-refraction and compensate for Vertex distance to determine final lens power.

Evaluate the fit during a slit lamp exam:

As in soft contact lens fitting, the evaluation is based on

  1. Centration
  2. Mobility
  3. Fluorescein at lens removal

Verify the alignment of the lens using large molecule fluorescein. Never use fluorescein for RGP lenses as this may damage the hybrid lenses.

Optimal_BC

Example of a good fit: Centration is good if the lens covers the entire corneal surface, Mobility is good if the lens moves easily about 0,25 mm with each blink

Too_steep_fit

too steep fit: Increase BC by 0,10 mm and Add + 0,50 dpt to lens power

Too_flat_fit

too flat fit: Decrease BC by 0,10 mm and Add -0,50 dpt to lens power

Lens care

Material

soft skirt:

ESiH Filcon V3 (clear)

Water Content:  Silikon Hydrogel 50%

Dk: 50 x 10-11 (ISO FATT)

RGP:

Optimum Extra Roflufocon D (blue + UV filter)

Dk: 100 x 10-11 (ISO FATT)

Read more

Videos:

use your VR Glasses or Cardboard to see a good fitting in 3D

How to put the contact lens in the eye

How to remove the contact lens

How to put the contact lens in the eye for fitters

How to put the fluorescein in the eye, for fitters, made by Paunevision