Column | I’m a doctor. Here’s why I wear sunblock indoors
By Caroline Ashford · Reporting from Richmond, Virginia ·
There is a deep comfort in the architecture of modern life: glass walls separating us from the unpredictable sun, climate control humming softly, and the assumption that because…
The Illusion of Indoor Safety
There is a deep comfort in the architecture of modern life: glass walls separating us from the unpredictable sun, climate control humming softly, and the assumption that because we are sheltered, we are safe. We build these lovely little cocoons—our homes, our offices—and treat them as impenetrable barriers against nature’s harshest elements. But what this latest round of medical reporting reminds us is that vigilance is not a seasonal chore; it is a constant state of being. The myth that one can safely neglect the sunblock simply because they are indoors is nothing short of dangerous complacency, and frankly, it speaks to a deeper cultural drift—a belief that modern conveniences have rendered us immune to basic biological realities.
Invisible Rays Bypass Our Best Intentions
The science, laid out by institutions ranging from columbiamemorial.org to keckmedicine.org, is remarkably consistent: the glass separating you from the world does not offer total protection. While standard window glass blocks most of the UVB rays—the ones that cause immediate sunburns—it allows a significant portion of UVA radiation to pass through unimpeded. As dermatologists like Tracy Evans, M.D., emphasize in goodhousekeeping.com, this invisible penetration means that even sitting near sunny windows "can still contribute to long-term skin aging and pigmentation." The danger is not the sudden blast of tropical heat; it is the cumulative damage from these subtle, persistent leaks of energy.
This concept—that an unseen force can penetrate a barrier designed for protection—is hardly new. Consider the discovery of X-rays: a form of high-energy electromagnetic radiation that penetrates solid matter to reveal internal structures or cause damage. The shared mechanism here is profound: the ability of invisible energy to bypass perceived safety and affect what lies beneath the surface. Just as early medicine had to grapple with the reality that unseen waves could reveal bone structure, we must now accept that unseen UVA rays are actively damaging our collagen and increasing our risk for skin cancer, regardless of whether we are driving in a car or sitting by a bay window.
The Discipline of Daily Care
What this story demands is not simply a product recommendation; it is a re-commitment to personal discipline. We are told that sunscreen must be applied daily, with an SPF 30 or higher, and reapplied diligently. Dr. Kseniya Kobets notes that the areas people most often forget—the ears, the back of the neck, the backs of the hands—are also common sites for skin cancers. It is a failure of attention, not necessarily a failure of science.
The culture we are cultivating, I worry, is one where convenience trumps care. We expect our technology and our architecture to solve every problem, and in doing so, we have become lax about the simple, reliable habits that keep us whole—the daily application of cream, the wearing of a hat, the remembering of what was taught by good doctors.
The message is clear: vigilance against invisible threats requires constant effort. We cannot afford to treat our skin care like an occasional remedy for visible damage. Just as we must remember that X-rays reveal structures hidden from plain sight, we must accept that the most persistent and damaging forces—the UVA rays—are those that sneak through the glass and wait patiently until years of cumulative neglect finally take their toll.