Side mirrors were not always part of automobiles. There was a time when simply turning one’s head was enough to check the surroundings. However, as speeds increased and more vehicles filled the roads, it became clear that accidents were more likely to occur not in front, but in the unseen areas to the side and rear. What began as a device to reduce blind spots has since become indispensable. The origin dates back to 1911, when Ray Harroun installed a mirror on his car during the ‘Indianapolis 500’. Today, the driver-side mirror uses a flat lens to provide an accurate sense of distance, while the passenger-side mirror adopts a convex lens to secure a wider field of view. Just as a device that reveals hidden areas has transformed the way we drive, healthcare, too, must strive to broaden its field of vision.

As medicine advances, the scope of what remains unseen continues to expand. This is not due to a lack of knowledge or technology, but because certain aspects still fall outside the clinician’s field of view. While treatments become increasingly precise, the patient experience grows more complex. In clinical practice, three areas are particularly easy to overlook.

First, there is a gap in time. Treatment takes place in the hospital, but side effects and changes in condition often emerge outside of it. It is difficult for clinicians to capture the exact moment when symptoms such as diarrhea or pain worsen after chemotherapy. The period between outpatient visits passes without continuous clinical observation.

Second, there is a gap in communication. Patients may notice subtle changes such as fatigue or low mood, yet hesitate to mention them, thinking they should endure such symptoms. If clinicians do not ask, patients often remain silent, allowing risks to quietly grow in that space.

Third, there is a gap in perception. Physicians tend to assess treatment outcomes based on objective indicators such as imaging findings or survival rates. However, the patient’s lived experience can differ significantly. For many patients, preserving fundamental functions such as walking, speaking, or eating after treatment is often a more immediate and pressing concern.

The tool that helps reduce these unseen areas is the Patient Reported Outcome Measures, or PROM. PROM is not a simple satisfaction survey. Patients report changes in symptoms, function, and quality of life before and after treatment, enabling clinicians to detect subtle changes that might otherwise be missed within a structured system. This not only improves treatment safety, but also supports more patient centered clinical decision making.

Automotive side mirrors have evolved alongside advances in technology. Sensors and cameras now detect the surrounding environment, issuing early warnings, anticipating risks, and enabling timely responses. What began as a device for viewing the sides and rear has expanded into technology that supports autonomous driving systems. PROM follows a similar trajectory. It does not merely record a patient’s current condition. Instead, it continuously captures changes in the patient’s status and helps guide adjustments in the course of treatment. This also carries significant implications for clinical research. As new drugs and surgical techniques emerge, outcomes must be evaluated not only in terms of survival, but also in terms of quality of life and functional changes. Such data ultimately form the evidence base for establishing future standards of care.

The passenger-side mirror carries a warning: “Objects in mirror are closer than they appear.” A convex lens expands the field of view, but it can also make distances feel farther than they actually are. Medicine is no different. Problems do not suddenly emerge from afar; rather, they surface when they are already close but not sufficiently recognized.

Patient centered care does not begin with accumulating more data. It begins when the changes experienced by patients are accurately recorded and systematically analyzed. Only then can we move toward better and more effective treatment.