Name: HydroCone - best comfort with keratoconus contact lenses
SKU: HydroCone
Availability: InStock

Description

Geometry

Spherical back optic zone with strong aspheric flattening
Front toric optic zone
Dynamic stabilisation with bumps nasal and temporal (Ext Dyn)
Optimised centre thickness
Marking at 0° and 180°

Variations

HydroCone 12: keratoconus of degrees 1 to 2

HydroCone 34: keratoconus of degrees 3 to 4

HydroCone P:Multifocal-variants of HydroCone 12 and 34 with front optic zone in Bifocal (Bf) / Simple progressive (Sp) / Multi progressive (Mp)

Image Credit Andy Dätwyler, Pfarrer Contactlens, Bern - Switzerland

Materials

High DK Materials: Igel 77, Definitive 74, Unisil 62

Technical Data

Parameter	from	to	steps
Total diameter	12.00 mm	15.00 mm	0.01 mm
Base curve	7.00 mm	12.00 mm	0.01 mm
Sphere	-40.00 dpt	+40.00 dpt	0.01 dpt
Cylinder	-0.25 dpt	-8.00 dpt	0.01 dpt
Axe	0°	180°	1°
Addition	+0.50 dpt	+4.00 dpt	0.01 dpt
Central optical zone Zoc	1.00 mm	5.50 mm	0.01 mm
Flattening	(+) K12	(++) K34

Additional information

Application	Distance vision, Presbyopia
Indication	Keratoconus
Correction type	Myopia, Hyperopia, Astigmatism
Lens Type	Soft
Designed by	SwissLens

Fitting advices for ToriFlex

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

Keratoconus classification

First apply the topographic indications or the following rules:

Vcc > 0.6 and/or keratometry > 6.80 mm: grade 1 or 2 (HydroCone K12)
Vcc < 0.6 and/or keratometry < 6.80 mm: grade 3 or 4 (HydroCone K34)

Diameter and base curve: 1st trial lens

HydroCone K12: BC = 8.00 / ØT = 14.00 mm
HydroCone K34: BC = 7.80 / ØT = 13.70 mm

Advice

The first trial lens helps to validate BC / ØT.
Dynamic stabilisation marks are needed to measure the stabilisation axis
The power (F’v) is spherical because part of the correction is made by the tear film and can’t be anticipated. The final cylinder corresponds to the residual astigmatism.
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.
Use upper and lower eyelids to remove the contact lens.
By halo, increase optic zone diameter
Measurement of the residual astigmatism with autorefractometer plus subjective refractometry.
Due to geometry, the contact lens can slip a little bit to the bottom.
Increasing centre thickness can improve the visual acuity.
HydroCone P fitting: initially fit with HydroCone (single vision toric lens) then add progression in a second step BC

First contact lens choice

Progression system and central optic zone (Zoc)

Reading zone choice

Centre near vision in most cases
Peripheral near vision if distance vision is poor, high myopia or decentrated pupil.

Procedure

Determine dominant eye
Find maximum convex (+) correction for distance vision
Find the best acuity in distance vision to optimise Zoc diameter choice
Determine the patients needs for: distance / intermediate / near Multifocal design choice

Multifocal design choice

Requirements	Bifocal Bf	Simple progressive Sp	Multi progressive Mp
Hyperopia			√
Myopia Addition < 1.75 dpt	√
Myopia: Addition ≥ 1.75 dpt		√
Priority in distance vision	√	√
Priority in near vision	√		√
Priority in intermediate vision (computer)			√
Use in low light in distance vision		√
Use in low light in near vision			√
Good contrast	√		√
Low Helos		√
Anisometropia > 2.00 dpt	√	√
Amblyopia	√	( √ )
Modified monovision care	( √ )	√

Central optic zone, position and diameter:

recommendations for the 1st choice: standard pupil (3.50–4.00 mm) with normal lighting

	Bifocal Bf	Bifocal Bf	Simple progressive Sp	Simple progressive Sp	Multi progressive Mp
Position	Centre near (CN)	Centre Distance (CD)	Centre near (CN)	Centre Distance (CD)	Centre near (CN)
Dominant eye	2.25	3.75	2.50	4.00	1.50
Non-dominant eye	2.75	3.25	3.00	3.50	1.75
Undefined	2.50	3.50	2.75	3.75	1.50

For non standard pupil size or for distance/near preference, fit the Zoc in steps of 0.25 mm

Publication on HydroCone

Clinical Performance of Toris K Contact Lens in Patients with Moderate to Advanced Keratoconus: A Real Life Retrospective Analysis

HydroCone lens visual performance and impact on quality of life in irregular corneas; Dilay Ozek, Contact lens and antorior eye Feb 2016

Silicone hydrogel keratoconus lens fitting in corneal ectatic diseases, Canan Asli Utine, MD

Soft contact lens (HydroCone/Toris K) fitting in patients with keratoconus. Dr. Yavuz, Istambul

HydroCone/Toris K Soft Lenses for Keratoconus. Dr. Günes

HydroCone/TorisK Dr. Koray, Dr. Nisa

Success of HydroCone (TORIS-K) soft contact lens

HydroCone