Which of the following is NOT listed as a potential cause of secondary lens luxation?

• A. Diabetic retinopathy
• B. Chronic uveitis causing dissolution of zonular fibers
• C. Glaucoma
• D. Trauma

Answer: (A)

Secondary lens luxation happens when the zonular fibers that hold the lens in place become damaged or weakened. Chronic uveitis can cause enzymatic breakdown of these zonules, so the lens loses its support and can subluxate or luxate. Trauma directly fractures or tears the zonular attachments, producing the same outcome. Glaucoma can contribute to lens instability through long-standing changes in the anterior segment that affect support structures, so it can be a listed cause in some contexts. Diabetic retinopathy, however, mainly affects the retina’s vasculature and does not directly damage the zonular apparatus. It targets the posterior segment rather than lens-support structures, so it is not typically considered a cause of secondary lens luxation.