What are potential causes of primary lens luxation?

• A. Bilateral disease
• B. Hereditary and breed-related
• C. Primarily terrier breeds
• D. Genetic test available

Answer: (B)

Primary lens luxation arises from inherited weakness of the zonular fibers that suspend the lens. This condition shows a hereditary pattern and breed predisposition, so certain breeds are overrepresented among affected dogs. That combination—hereditary origin with breed-related risk—is the best explanation for the potential causes of primary lens luxation. While many cases can involve both eyes and terrier-type breeds are commonly reported, these points describe how the disease tends to appear rather than what causes it. There isn’t a widely used clinical genetic test to confirm the cause, so pointing to a test availability isn’t an accurate explanation of the cause.