Research consistently highlights the beneficial effects of sunlight on our mood and overall well-being, earning it the reputation of being good for the soul. However, when it comes to skin health, the sun poses significant risks. Dermatologists worldwide emphasize the necessity of daily protection against ultraviolet (UV) rays, advocating for the use of sunglasses, wide-brimmed hats, and broad-spectrum sunscreens, especially during outdoor activities. Despite these precautions, recent scientific insights suggest that indoor environments may harbor their own threats to skin health.
Sun and Screens
In a quick flashback to high school physics, we learn that light comprises electromagnetic particles moving in waves, with varying intensity and length measured in nanometers (nm). Shorter wavelengths signify higher energy levels. The human eye perceives only a small segment of this spectrum, known as visible light. Within this spectrum lies blue light, or high-energy visible light (HEV), typically ranging from 400-450 nm, closest in wavelength to UV light (200-400 nm).
Common indoor fixtures such as computer screens, smartphones, TVs, LED light bulbs, and even fluorescent signs emit blue light. Interestingly, sunlight remains the primary source of blue light, its high-energy emissions scattering in Earth’s atmosphere, painting our skies blue. But what risks does this light pose when encountered indoors?
The Problems with Screen Time
Reports indicate that Americans spend a significant portion of their waking hours, often more than 9 hours a day, engaged with screen-based media. While excessive blue light exposure’s impact on sleep patterns is well-documented, its effects on the skin are still unfolding. Emerging research suggests that artificial blue light from screens and LEDs triggers melanogenesis, a process where the skin produces more pigment. This phenomenon can exacerbate or induce melasma, characterized by brown patches on the face, particularly common among women and those with darker skin tones.
Moreover, blue light exposure can instigate free radical damage, contributing to discoloration, fine lines, and sagging skin. Additionally, evidence suggests that visible light induces the expression of enzymes like MMP-1 and MMP-9, which degrade collagen, leading to premature aging. While the eyes are not directly vulnerable to blue light-induced diseases, extended screen time can cause discomfort such as dryness, blurriness, and headaches.
Don’t Be So Blue
Despite the distressing implications of melasma and premature aging, there are silver linings. Effective treatments exist for managing melasma, and reassuringly, no direct link has been established between artificial blue light exposure and skin cancer. Intriguingly, dermatologists occasionally utilize blue light in controlled bursts to treat certain inflammatory skin conditions like acne.
Screen Protectors
To safeguard skin health, reducing screen time and investing in screen filters that minimize blue light exposure are advisable strategies. Alternatively, activating night mode on devices can reduce blue light emission. Additionally, applying mineral-based sunscreens containing titanium dioxide, zinc oxide, and iron oxides can provide added protection against both UV and blue light.
SPF Saves the Day, Indoors and Out
Despite seeming unconventional, scientific evidence underscores the importance of daily sunscreen use indoors and outdoors. By incorporating SPF into your daily routine, you ensure comprehensive protection against potential skin damage from various sources of light. Studies are also showing that using a “tinted sunscreen” containing iron oxides are proving beneficial to protecting against visible light, particularly in people of colour.
In conclusion, prioritizing skin health involves proactive measures such as minimizing screen time, employing protective technologies, and consistently using sunscreen. Consulting a board-certified dermatologist ensures personalized care and access to the latest insights in skin health maintenance. By taking these steps, you can confidently preserve your skin’s radiance and vitality.
Please note: For personalized skincare advice, always consult a qualified dermatologist.
References:
Francois-Newton V, Kolanthan VL, Mandary MB, Philibert EG, Soobramaney V, Petkar G, Sokeechand BN, Hosenally M, Cavagnino A, Baraibar MA, Ng SP. The protective effect of a novel sunscreen against blue light. Int J Cosmet Sci. 2022 Aug;44(4):464-476. doi: 10.1111/ics.12794. Epub 2022 Aug 1. PMID: 35689421.
Kumari J, Das K, Babaei M, Rokni GR, Goldust M. The impact of blue light and digital screens on the skin. J Cosmet Dermatol. 2023 Apr;22(4):1185-1190. doi: 10.1111/jocd.15576. Epub 2023 Jan 3. PMID: 36594795.
Suitthimeathegorn O, Yang C, Ma Y, Liu W. Direct and Indirect Effects of Blue Light Exposure on Skin: A Review of Published Literature. Skin Pharmacol Physiol. 2022;35(6):305-318. doi: 10.1159/000526720. Epub 2022 Aug 31. PMID: 36044837.
Bernstein EF, Sarkas HW, Boland P. Iron oxides in novel skin care formulations attenuate blue light for enhanced protection against skin damage. J Cosmet Dermatol. 2021 Feb;20(2):532-537. doi: 10.1111/jocd.13803. Epub 2020 Nov 18. PMID: 33210401; PMCID: PMC7894303.
Lyons AB, Trullas C, Kohli I, Hamzavi IH, Lim HW. Photoprotection beyond ultraviolet radiation: A review of tinted sunscreens. J Am Acad Dermatol. 2021 May;84(5):1393-1397. doi: 10.1016/j.jaad.2020.04.079. Epub 2020 Apr 23. PMID: 32335182.
Cole Y, Ilyas AM, Ilyas EN. Availability of Adequate Photoprotection for Skin of Color. Cureus. 2023 Aug 1;15(8):e42794. doi: 10.7759/cureus.42794. PMID: 37664385; PMCID: PMC10470041.