A mains electricity (AC-powered) mobile device assembly, with a rechargeable battery, designed to deliver a uniform and metered dose of ultraviolet A (UVA) light to the cornea to perform an ophthalmic crosslinking procedure (collagen fibres in the cornea are linked together to stiffen the cornea). It is normally used in a clinical office setting and typically consists of a wheeled central mount that supports the optic head containing the UV source, user control panel, software, and a rechargeable battery. It is typically used to treat corneal disorders such as keratoconus, post laser assisted in situ keratomileusis (LASIK) ectasia, and other post-LASIK disorders.