Quest for Vision





 - Products for Veterinary Vision

To better serve our Canadian customers, EYETECH Optics Ltd. and Keragenix Inc. have formed a joint venture to offer Veterinary Ophthalmic Products directly in Canada.


THE CUTTING EDGE Div. is one of the very few, possibly, the only source of therapeutic soft contact lenses expressly designed and manufactured for dogs, cats, horses and exotic species.

Polymers range from 55% water to 73% hydrophilic. The 55% lenses, like human contact lenses, are ideal for delivering topical medication to the eye. Human contacts are typically 55%, less expensive polymers for refractive applications but not optimum to treat corneal lesions or uveal maladies. The 73% hydrophilics, however, are preferred for problems like corneal ulcers.

Canine Soft Contact Bandage Lenses

CANISTM---55% Hydrophilic
Stronger polymer for short duration treatment
Diameter 14mm 14.5mm 15mm 16mm
Base Curve 8.3mm (steep) 8.6mm 8.9mm 9.3mm (flat)
Breed Example Boston Terrier Chihuahua Cocker Spaniel Doberman
Box of 4

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Feline Soft Contact Bandage Lenses

FELIXTM---73% Hydrophilic
Feathered edge to resist "windshield wiper effect"
  Felix I Felix II Felix III Felix IV
Diameter 16mm 17mm 18mm 19mm
Base Curve 9.3mm 9.8mm 10.2mm 12mm
Box of 4

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Equine Soft Contact Bandage Lenses

EQUUSTM---74% Hydrophilic
Finest European polymer
Diameter 30mm 34mm 38mm Custom
Base Curve 16mm 18mm 19mm
Clear per pair

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Eq. HydroBluesTM
Cosmetic Dk. Brown

How do hydrophilic Contact Bandages work?

Each soft bandage lens is packaged in isotonic sodium chloride in crimp sealed, glass vials.They are autoclaved (steam sterilized) at 250F+ degrees for 20 minutes --enough for even a stubborn sporulating organism.

At time of use, the lens is removed and may be placed in the topical medication of choice allowing it to "sponge up" to the lens' point of hydrophilicity. In other words, a 55% can retain only 55% of the desired medication. A 73% water content allow somewhat extended treatment.

Soft, bandage contacts deliver in quasi-time release fashion --- much like placing a small sponge onto the eye.

Alternately, drops may be applied directly to the in situ placed lens.

Fitting? The best method, of course, is to measure the corneal curvature (keratometry) as well as the distance from "white to white" in millimeters. However, any measurement of corneal curvature is rare and fairly impractical in private practice. Plastic and cardboard measuring devices are mostly "illusions of accuracy". Practice and experience are the most effective metrology tools.

Rule of Thumb: The smaller the lens diameter, the steeper the curvature. For example, a 14mm diameter lens suitable for a Boston Terrier has a steep curve of 8.3mm; a 38mm diameter for a big Arabian horse has a flat curvature of 19mm. The tables above make this easier to see.

How long will they stay on? :
Fair question. Difficult answer.
The influencing factors are temperature, humidity, winds, activity of the animal and lysozyme actions on the patient's eye. Lenses with higher hydrophilicity tend to remain on the eye for longer periods.

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