Bandage contact lens retention in dogs—A pilot study

Abstract

Objective To assess and compare retention, application characteristics, and patient tolerance of nine bandage contact lens types from four manufacturers. Animals studied Six research Beagles were used in this pilot study. Procedure Five bandage contact lens types from two veterinary brands and four bandage contact lens types from two human brands were evaluated in six research Beagles. Placement ease, the dogs’ contact lens tolerance, and contact lens retention time for up to 14 days were recorded. Statistical analysis with a linear mixed model was performed. Results Veterinary contact lenses had an average retention time of 0.4 days (range 0‐7 days, with an average of 10% and 3% retained ≥1 and ≥7 days, respectively), while human contact lenses had a significantly (P < 0.0001) longer average retention time of 5.2 days (range 0‐14 days, with an average of 83% and 37.5% retained ≥1 and ≥7 days, respectively). Specifically, Johnson and Johnson Vision Care Acuvue® Oasys™ with Hydraclear™ Plus lenses were retained significantly longer than all veterinary lenses, and Bausch and Lomb PureVision® 2 lenses were retained significantly longer than Keragenix HydroBlues™ 18 and AnimaLens™ HRT 78 18 mm lenses. Conclusion Although all bandage contact lenses were easy to use and well tolerated by the dogs, the human lenses were retained significantly better and longer than the veterinary lenses. Additionally, human lenses were retained significantly better and longer than veterinary lenses of similar measurements. This suggests factors other than measurement and associated fit may determine contact lens retention time.

Medical anti‐glaucoma therapy: Beyond the drop

“…However, anatomical and physiological variations between humans and dogs are likely to influence the ultimate applicability of this device in veterinary ophthalmology. For example, the intercanthal distance is not a measurement with published reference values in the dog, the range of normal canine skull conformation is large, and movements of the third eyelid may reduce retention rates compared with humans as it does with soft contact lenses 65 …”

“…Ocular Therapeutix (Bedford, MA, USA) has taken an alternative approach to sustained ocular drug delivery, developing a device placed into the inferior nasolacrimal canaliculus that releases drug to the ocular surface via the inferior punctum 65 . The preservative‐free bioerodible implant is rod‐shaped comprising drug‐carrying poly(lactic acid) microparticles in a polyethylene glycol hydrogel.…”

Magnesium Hydroxide Nanoparticles Improve the Ocular Hypotensive Effect of Twice Daily Topical Timolol Maleate in Healthy Dogs

“…Hydrogels prolong the drug contact time to the ocular surface, but their high viscosity may lead to ocular discomfort or irritation [ 26 , 27 ]. Drug-absorbed contact lenses must be retained on the corneal surface, but the shorter retention time is a major concern [ 28 ]. On the other hand, a fixed combination with a nanocarrier is a simplistic method of improving its ocular bioavailability and can be used in the same way as commercial eyedrops.…”

Retention, Bacterial Adhesion, and Biofilm Formation between Anionic and Zwitterionic Bandage Contact Lenses in Healthy Dogs: A Pilot Study

“…In the field of human ophthalmology, anterior corneal curvature is routinely measured using a keratometer while fitting BCLs [ 5 , 6 , 7 ]. However, in veterinary ophthalmology, keratometry is not commonly used in selecting BCL sizes [ 1 , 2 , 3 , 4 , 8 , 9 ]. In addition, there are considerable variations in corneal curvature among canine breeds and weights.…”

“…In addition, there are considerable variations in corneal curvature among canine breeds and weights. Most veterinary ophthalmologists are likely to stock no more than a few BCLs of different types and sizes [ 9 , 10 ]. Thus, BCLs having an appropriate base curve (BC) for the canine corneal curvature may not always be applied.…”