The Impact of Blue Light.

Increased computer use has changed the visual demands of today's society based on aspects such as the angle of viewing, the working distance, and the types of eye movements required. However, the effects of screen light are not fully understood. Blue-light blocking lenses are promoted not only to reduce digital eye strain, but also to prevent the decline of ocular health - specifically photochemical retinal damage. Blue light is suggested to impact scotopic vision and circadian rhythm. Hard evidence is lacking in determining whether these lenses are effectively designed and are performing as advertised. Many of the studies are not long-term, lack a control for the placebo effect, or are poorly controlled. The effects of blue light remain unclear. There have not been any reported negative consequences to blue-blocking lenses, but the objective data for them is still lacking and inconclusive. It is known that light impacts our visual comfort, circadian rhythm, and ocular health (if at high levels). Note that even the more popular lenses on the market may not be blocking as much light as advertised, and the patient may be better off changing their work environment and screen to "night mode" if they are interested in completely removing all blue light exposure. All this being said, this is the first time period in which screens have become such an integral part of our lives at such a young age, so it is an important body of work to pay attention to so we can best direct our patients. This literature review examines 5 studies in the area of blue-light blocking lens technology. [ABSTRACT FROM AUTHOR]