Post surgery

hydrmed-logo hydrmedP-logo

The backsurface of the HydroCone can be fully customized to get a perfect fit after a Post Lasik, Post Graft or any other corneal and scleral irregularities. Due its patented design, the oxygen supply and comfort is the same as with standard contact lenses.

Geometry

  • Spherical back optic zone with customisable spherical flattening (inverted or not)
  • Front toric optic zone
  • Dynamic stabilisation with bumps nasal and temporal
  • Available with optimized center thickness

Variantions

hydromed-1 logo 1 customisable peripheral zone

hydromed-2 logo 2 customisable peripheral zones

hydromed s1shydromeds2s

HydroMed P

Multifocal-torical front optic zone in Bifocal (Bf) /  Simple progressive (Sp) /  Multi progressive (Mp)

Technical data

  • Total diameter: 12.00 -> 17.00 mm
  • Base curve: 7.00 -> 12.00 mm
  • Sphere: -40.00 -> + 40.00 dpt
  • Cylinder: -0.25 -> -8.00 dpt
  • Axe: 0° -> 180°
  • Addition: +0.50 -> +4.00 dpt
  • Central optical zone Zoc: 1.00 -> 4.50 mm
  • Flattening: 1 or 2 customisable peripheral zones

steps 0.01 mm / 0.01 dpt / 1°

First fitting

We suggest working with trial lenses with cyl −0.01 dpt.

Geometry choice

  • Post Lasik: 2 curves (S1S), 1 inverted flattening
  • Post keratoplasty: 3 curves (S2S), 2 customisable flattening (inverted or not)

Diameter and base curve: 1st trial lens

  • ØT: corneal diameter + 2.5 mm
  • ØO: central operated optic diameter measured by topography. Otherwise default value
  • rO: rcfl + 0.30 mm
  • Ø1 (S2S):external diameter of the operated zone
  • r1 (S1S) and r2 (S2S): standard base curve of a soft contact lens (~8.70 mm)
  • r1 (S2S): overlapping zone (Zr), if rO < r2: r1 = r2 + ~0.30 mm / if rO > r2: r1 = r2 − ~0.30 mm

Advice

  • The first trial lens helps to validate base curves and diameters. Dynamic stabilisation marks are needed to measure the stabilisation axis.
  • F’v for the trial lens order: spectacle sphere (adjust BVD = 0) with −0.01 dpt × 180° cylinder.
  • For changes and control over several months always use the initial (genesis) lens for over refraction.
  • It’s possible to use virtual fitting assistant to determine the different zones.
  • We recommend using Fluorescein with large molecules to detect and identify problems resulting from the fit.
  • Measure the residual astigmatism by autorefactometer plus subjective refractometry.
  • Due to inverted flattening, a weak mobility of the contact lens is normal.
  • It’s possible to modify centre thickness to adjust cornea irregularities (see HydroCone).
  • HydroMed P fitting: initially fit with HydroMed (single vision toric lens) then add progression in a second step

Materials

Read more