Spectacle eyewear4/15/2023 It has been proposed that avoiding blue light during the day could disturb the natural sleep-wake cycle and hence negatively affect sleep quality. In addition, daytime exposure to blue light regulates the human internal circadian (24-hour) biological clock, stimulating the brain to stay awake during the day by inhibiting melatonin secretion. While blue-light filtering intraocular lenses have been widely tested in laboratory and clinical studies, the optical characteristics and clinical performance of similar products for spectacle lenses remain unclear. The S-cone and rod photoreceptor cells, which are responsible for these visual functions, reach their maximum sensitivity under blue and blue-green environments. ![]() For example, blue light plays an important role in colour discrimination and night vision. While excessive blue light is theoretically harmful, adequate blue light is necessary for normal visual function. However, one key challenge when using these products is finding the balance between effectively reducing blue-light hazards without compromising the essential visual functions in daily life, i.e., there is a pressing need to determine the potential benefits of these blue-light filtering ophthalmic devices. These lenses claim to use filtering materials or surface coatings to reduce the spectral transmittance of short-wavelength blue light. There has been a surge of new ophthalmic aids including intraocular lenses and spectacle lenses designed with a rationale to protect the eyes from potential photochemical damages. With the increasing popularity of blue-rich LED-backlight display devices, such as mobile smartphones, ultraportable tablets, and computer screens, our eyes are exposed to more blue light than in the past. The sun and artificial light sources, including LED (light-emitting diode) light bulbs and fluorescent light tubes, are the primary sources of blue light, emitting the amount of blue light that approaches the international exposure limit. ![]() This process may explain why excessive sunlight exposure associates with age-related macular degeneration (AMD), the third leading cause of worldwide blindness, though other hypotheses have been advanced. ![]() Data from animal and in vitro studies suggest that in an ageing eye, the accumulation of lipofuscin (in particular its major retinoid fluorophore A2E) within the retinal pigment epithelium makes the retina even more vulnerable to high-energy blue radiation, leading to cell apoptosis. It has drawn increasing attention due to a hypothesis suggesting that blue light has the potential to induce photochemical damages to the retina. Blue light is short-wavelength electromagnetic radiation (400–500 nm) in the visible spectrum (400–780 nm) that carries the highest amount of energy per photon.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |