Physical and biological characteristics of solar UV-radiation wavebands A, B, and C are explained and information is provided on UV-levels in particular environments and ocular tissues. The question whether or not the rise in circumpolar UV of the last 20 years or so can be regarded as a threat is briefly addressed and it is concluded that even if no threat to photosynthetic productivity of crops and vegetation exists, there is a danger regarding the status of health of human skin and eyes (in particular the lens). The nature of the UV-induced damage to cornea, lens, and even the retina with its photo-receptive cells and pigment epithelium is assessed and a word of caution is sounded with regard to possible injury-potentiating effects of certain chemicals as seen, for instance, in the recent and alarming rise of cataract in Scottish salmon. Finally, because of the multifaceted effects of UV (e.g. at molecular, cellular, tissue, individual, population, and ecosystem level), a plea is made for a concerted, well-funded, international effort to tackle the many remaining problems at all fronts and from all possible angles.