in age-related cataract, the pathogenesis of cataract development is multifactorial and includes the foDrug or chemical toxicity. Toxic cataracts result from drug or chemical toxicity with prednisone, ergot alkaloids, dinitrophenol, naphthalene, phenothiazines, or pilocarpine, or from extended exposure to ultraviolet rays
Clinical Manifestationsllowing factors: Compaction and stiffening of the central lens material (nuclear sclerosis) as new layers of cortical (outer lens) fibers continue to proliferate over time.