Has mixed dry eye disease been documented in dogs?

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Study for the ACVIM Small Animal Internal Medicine Exam to enhance your veterinary knowledge. Prepare with flashcards and multiple-choice questions, featuring hints and explanations. Ensure success in your exam journey!

Multiple Choice

Has mixed dry eye disease been documented in dogs?

Explanation:
The concept here is that dry eye in dogs can involve more than one part of the tear film at the same time. The tear film has three components—aqueous, mucin, and lipid—and diseases can affect several of these layers together. In dogs, there are published observations of cases where both aqueous tear production is decreased (KCS) and mucin or lipid layer function is impaired, leading to a mixed tear-film dysfunction rather than a single isolated defect. This combination has been described in the veterinary literature, so mixed dry eye disease has indeed been documented in dogs.

The concept here is that dry eye in dogs can involve more than one part of the tear film at the same time. The tear film has three components—aqueous, mucin, and lipid—and diseases can affect several of these layers together. In dogs, there are published observations of cases where both aqueous tear production is decreased (KCS) and mucin or lipid layer function is impaired, leading to a mixed tear-film dysfunction rather than a single isolated defect. This combination has been described in the veterinary literature, so mixed dry eye disease has indeed been documented in dogs.

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