This is a multi-center, multinational, active-controlled, double-blind, randomized (1:1) parallel group study of the effects of inhaled ciclesonide HFA-MDI 640 mcg/day and beclomethasone HFA-MDI 640 mcg/day on lens opacification in adult subjects with moderate to severe persistent asthma. The study consists of a 1-14 day screening phase during which subject eligibility will be determined, followed by a 12-month double-blind treatment phase. Lens opacification will be evaluated by slit lamp examination performed after pupillary dilation to at least 6.0 mm before randomization and after 4 months, 8 months, and 12 months of treatment using the LOCS III system for grading lens opacities. Best-corrected visual acuity and intraocular pressure will be measured at each eye examination visit. An Independent Data Monitoring Committee (IDMC) will be constituted to monitor safety throughout the double-blind treatment phase.