Quest for Vision
THE CUTTING EDGE CANADA
- 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.
SOFT, CONTACT BANDAGE LENSES
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
Feline Soft Contact Bandage Lenses
Equine Soft Contact Bandage Lenses
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? :
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