Hydrocyl 38 – Cantor Barnard

Hydrocyl 38 by Cantor Barnard is a custom-made medical soft Toric contact lens manufactured according to the prescription and measurements of each eye. It is designed to correct Astigmatism, with simultaneous correction of Myopia or Hyperopia when required.

The lens uses:

Dynamic Stabilisation using Differential Thinning

to help maintain lens orientation and the corrective axis during blinking and eye movement.

It also features:

Back Surface Toric

for improved stability, together with a:

Prism-Free Ultra-Thin Optic Zone

Delivery Time

The lenses are supplied within a maximum period of:

30 to 60 days

from the date the order is confirmed.

Lens Design

Hydrocyl features a thin tapered edge profile and controlled interaction with the lower eyelid to help maintain lens orientation.

The lenses are manufactured using:

Computer-Controlled Lathes

to support high precision and reproducibility of customized prescriptions.

Lens Material

The Hydrocyl 38 version is made from:

Contaflex 38 – Polymacon / Filcon 1

Water content:

38%

Oxygen permeability:

Dk ≈ 8

This is a conventional Hydrogel material suitable for manufacturing custom soft lenses using:

Lathe-Cut Technology

Official Lens Specifications

Important Note About Base Curve and Diameter

The ranges:

Base Curve: 6.60–10.40 mm

and:

Diameter: 11.00–20.00 mm

represent the published general range for the Hydrocyl family.

Cantor Barnard notes that some Base Curve and Diameter combinations may be restricted depending on the selected lens material.

Contaflex 38 Material

Current published technical data from Contamac for the 38% material includes:

These properties relate to the raw Contaflex 38 material and are not necessarily fixed final specifications for every manufactured Hydrocyl lens.

Final characteristics such as:

• Lens thickness
• Oxygen transmissibility
• Dk/t

may vary depending on prescription and final lens design.

Dk Note

The Cantor Barnard booklet describes the material as:

Contaflex 38% water content – Filcon 1 (8)

Oxygen permeability:

Dk 8

Hydrocyl Toric Design

The official design includes:

• Dynamic Stabilisation using Differential Thinning
• Back Surface Toric
• Spherical Blended Front Surface with Dynamic Stabilisation
• Prism-Free Ultra-Thin Optic Zone
• Inferior Lid Interaction
• Thin Tapered Uniform Edge Profile
• Lathe-Cut Manufacturing

Toric Orientation Marks

Current Cantor Barnard guidance states that the Toric orientation marks are located in the lower section of the lens:

15° apart

The:

Central line should be at 6 o’clock

when assessing lens orientation on the eye.

This information is primarily intended for the fitting professional and does not need to be presented as a customer-selectable option.

Key Features

• Medical soft Toric contact lens
• Single Vision
• Astigmatism correction
• Myopia with Astigmatism correction
• Hyperopia with Astigmatism correction
• Cylinder up to -6.00D
• Full Axis range from 1° to 180°
• Sphere up to ±30.00D within the published range
• Dynamic Stabilisation
• Back Surface Toric
• Prism-Free Ultra-Thin Optic Zone
• Thin tapered edge
• Wide range of fitting parameters
• 38% water Hydrogel material
• Individually custom-made for each eye
• Lathe-Cut manufacturing
• Daily Wear
• Manufactured in the United Kingdom

Suitable Applications

Hydrocyl 38 may be suitable, following professional assessment, for:

• Astigmatism
• Myopia with Astigmatism
• Hyperopia with Astigmatism
• Astigmatic prescriptions unavailable in standard stock lenses
• Cases requiring a customized Base Curve
• Cases requiring a customized Diameter
• Higher spherical or cylindrical powers within manufacturing capabilities

Is It Multifocal?

No.

Hydrocyl 38 is:

Single Vision Toric

and is not:

Multifocal

Cantor Barnard provides separate designs for Presbyopia and Multifocal correction, such as the:

PV Series

Colors and Tints

Hydrocyl may support:

• Visibility Tints
• Pastel Tints in selected materials
• Reactive Dye Tints in certain materials
• Opaque Tints in 67% material only

Therefore, Hydrocyl 38 should not be described as Opaque.

Cantor Barnard limits the Opaque option to the 67% material.

If the product is listed simply as:

Hydrocyl Toric 38%

without a specified tint, it is better to represent it as:

Clear or with a light Handling Tint

rather than as a brown cosmetic lens.

Fitting Procedure

The official Hydro & Zero 6 Ranges fitting guide includes Hydrocyl.

Before fitting, it recommends:

• Full Refraction
• Eye Examination
• Keratometry
• HVID measurement
• Diameter selection
• Base Curve selection
• BVD adjustment of spectacle power when required
• Laboratory consultation when assistance is required for Toric conversion or unusual parameters

Diameter Selection

As an initial starting point, Cantor Barnard recommends:

Diameter = HVID + 2.00 to 3.00 mm

The final diameter is then adjusted according to:

• Coverage
• Movement
• Centration
• Push-Up Test

Initial Base Curve Selection

The company fitting guide provides the following starting-point table:

The values represent how much flatter the initial Base Curve may be selected relative to the:

Flattest K

as a starting point only.

They are not a final prescription.

Settling Time

After lens insertion:

Allow approximately 30 minutes

before the final fitting assessment.

Then evaluate:

• Comfort
• Centration
• Coverage
• Edge behavior
• Movement with Blink
• Push-Up Test
• Toric Orientation
• Over-Refraction

Good Fit

A good fit is characterized by:

• Good comfort
• Good centration
• Full limbal coverage
• Appropriate edge relationship
• Suitable movement with blinking
• Easy movement during the Push-Up Test
• Good return to the central position

Steep Fit

A steep fit may show:

• Good initial comfort
• Relatively good centration
• Very little or no movement
• Difficulty with the Push-Up Test
• Slow return to the central position
• Conjunctival indentation
• Blanching

Flat Fit

A flat fit may show:

• Poor comfort
• Poor centration
• Inadequate limbal coverage
• Edge stand-off
• Fluting
• Excessive movement
• An excessively easy Push-Up Test with poor return to the center

Replacement Schedule

Replacement: Up to 12 months maximum

or according to the assessment and recommendation of the eye care professional.

Lens Care Instructions

Cantor Barnard recommends the following for reusable contact lenses:

• Wash, rinse, and dry hands thoroughly before handling the lens
• Clean the lens after removal by rubbing it with the appropriate contact lens solution
• Rinse using the recommended solution
• Store in fresh disinfecting solution
• Do not reuse old solution
• Do not top up old solution with fresh solution
• Do not use tap water
• Do not use saliva
• Clean the lens case according to professional instructions without tap water
• Replace the lens case at least once per month
• Do not use a damaged lens
• Do not share lenses
• Do not swim while wearing the lenses
• Do not shower while wearing the lenses
• Do not use a hot tub while wearing the lenses
• Do not sleep in the lenses unless specifically permitted by the eye care professional

When Should Lens Wear Be Stopped?

Remove the lens and seek professional assessment if you experience:

• Eye pain
• Redness
• Swelling
• Blurred vision
• Unusual discomfort
• A white or yellow spot on the cornea

Cantor Barnard warns that inappropriate lens use or care may be associated with complications such as:

• Microbial Keratitis
• Acanthamoeba Keratitis
• Corneal Ulcer
• Corneal Abrasion

Parameters Required When Ordering

Important Warnings

Hydrocyl 38 is a custom medical Toric contact lens manufactured according to the prescription and measurements of each eye. Sphere, Cylinder, Axis, Base Curve, and Diameter must be determined by an eye care professional.

Available Base Curve and Diameter combinations may vary depending on the selected material and manufacturing capabilities.

The lens is intended for:

Daily Wear

and the appropriate wearing and replacement schedule should be determined individually by the eye care professional.