Consequently, limiting exposure to short-wave blue light (in time and intensity or by filtering) would help reduce visual difficulties for patients suffering from dry eye with low break-up time. Patients with dry eye experience fluctuations in visual acuity, which worsen when performing continuous close-up activities, particularly with screen use. A close link has been demonstrated between tear film stability and visual function under blue light exposure. Regardless of whether it is productive or evaporative dry eye, the symptoms worsen when carrying out close-up activities with any type of digital screens equipped with blue light-emitting LED lighting. Dry eye in VDT users has been associated with reduced tear film break-up time. The sensation of dry eye and its many associated symptoms is closely linked to CVS. CVS is defined as “the set of visual and ocular problems related to close work caused by the use of computers”, to which we should no doubt add “and with the use of digital mobile devices.” 2. In any case, there has been a spectacular increase in recent years in the number of consultations related to computer visual syndrome (CVS). Such eyestrain or if it is a cumulative factor added to ocular accommodation, convergence and postural problems, which are also affected by working on computers. « there has been a spectacular increase in recent years in the number of consultations related to computer visual syndrome (CVS) » It is not yet clear if the high intensity of the blue light emission by these digital screens is the unique cause of Reading or working with LED backlit screens increases visual fatigue which manifests as tensional and ocular symptoms with respect to other visual media or to written text. Scientific evidence for the link between blue light and these problems is reviewed here. It has been linked to various ocular problems that can be classified into five major groups: visual fatigue, dry eye, discomfort from glare (these three elements being closely linked), retinal cell damage, and alteration of physiological cycles (sleep, tiredness, depression, irritability). LED lighting has replaced the traditional bulbs and fluorescent tubes as the most efficient form of lighting in terms of energy.īlue light is the part of the visible spectrum closest to ultraviolet radiations, and is composed of short wavelengths ranging from 380 to 495 nm corresponding to the highest energy of visible light. in an increasing number of homes, workplaces and shops. Blue light is mostly emitted outdoors by the sun, but is also found indoors in “cold-white” light emitting diodes (LEDs) present in the lighting systems of most backlit screens, televisions, etc. One such problem is exposure to blue light. The digital revolution and the widespread use of smart mobile devices (telephones, tablets, e-readers, video display terminals, etc.) provide on the one hand innumerable benefits, but have led to the rise of a variety of novel visual problems.
0 Comments
Leave a Reply. |