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  • Phototherapy units designed to irradiate the cornea with relatively long-wave (in the range of 315 to 400 nm) ultraviolet type A (UVA) light, producing a strengthening effect on the stromal layers of the cornea. These devices typically consist of a lamp used to apply UVA radiation with a frequency and intensity according to the treatment performed; they usually work by photoactivating a dedicated solution (e.g., riboflavin). Collagen cross-linking ophthalmic phototherapy units are used in ophthalmic therapeutic procedures, such as keratoconus and ectasia (i.e., thinning) of the cornea following laser in-situ keratomileusis (LASIK) procedures.
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