Why Are Surgical Scrubs Green? The Science Behind Medical Uniforms

In the 19th century, doctors and surgeons did not wear the green or blue attire seen today, but rather pristine white. White coats and drapes were introduced to symbolise cleanliness, hygiene, and medical purity. Furthermore, white cotton could readily withstand high-temperature boiling, sterilisation, and intensive chemical bleaching.

However, as medical technology progressed, operating theatres were fitted with high-intensity surgical lights to provide surgeons with a clearer view of intricate organs and blood vessels. This brought the shortcomings of white attire to the forefront. Harsh lighting reflecting off white drapes and gowns directly into the surgical team’s eyes caused glare, eye strain, and rapid visual fatigue during procedures that lasted several hours.

A pivotal shift occurred in the early 20th century when surgeons began transitioning to green surgical drapes and gowns. The primary reason lies within the biology of human vision, specifically the functioning of photoreceptor cone cells in the retina, which detect three primary colours: red, green, and blue.

When surgeons stare intently at internal organs, blood, and human tissue—predominantly vivid red and pink hues—for prolonged periods, the red photoreceptor cells suffer from photoreceptor fatigue and transmit signals more slowly. If the surgeon suddenly shifts their gaze from the surgical field to a white wall or drape, the brain processes the reflected light incorrectly.

• The Afterimage Mechanism: White light contains all wavelengths of the visible spectrum. When red photoreceptors are fatigued, green and blue receptors continue to fire normally, causing the brain to project a ghostly greenish-blue illusion (an afterimage) across white surfaces.
• Impact on Surgical Procedures: These floating afterimages can obstruct visual clarity and distort perception of organ margins or incision lines, thereby increasing intraoperative risk.

Using green surfaces and scrubs immediately absorbs and cancels out this afterimage effect. Because photoreceptors are not restimulated by reflected white light, the eyes can recalibrate to visual equilibrium far more quickly.

According to the colour wheel, green sits directly opposite red. Placing complementary colours side by side creates the highest visual contrast possible.

The clinical benefits of alternating focus between green fabric and the surgical site include:

• Restoring Sensitivity to Red: Glancing at green allows fatigued red cone cells to rest. Consequently, when the surgeon looks back at the operative field, their eyes regain optimal sensitivity to subtle variations in red, pink, and brown tissue tones.
• Differentiating Anatomical Structures: Surgeons can distinguish overlapping blood vessels, nerves, muscle tissue, and fascia with greater clarity, minimising errors caused by visual misjudgment.
• Minimising Light Glare: Deep green or jade tones have a much lower Light Reflectance Value (LRV) than white, preventing harsh glare when working beneath high-wattage surgical spotlights.

Beyond visual perception, colour psychology plays a significant role in managing the emotional state of healthcare professionals. The operating theatre is a high-stress environment where split-second decisions directly affect patient outcomes.

Psychologically, green evokes feelings of calm, balance, and reassurance. Physiological research indicates that environments incorporating green and blue tones help stabilise heart rate and blood pressure while moderating stress hormone release, fostering a focused and composed working atmosphere for surgical teams throughout long procedures.

Today, alongside traditional surgical green, many hospitals utilise teal and dark blue scrubs in operating theatres. These shades retain complementary properties against red while offering a fresh, contemporary aesthetic.

Beyond colour choice, selecting the right fabric for medical textiles and scrubs entails rigorous technical requirements:

• Thermal Durability: Fabrics must endure repeated high-pressure steam sterilisation (autoclaving) without thinning, degrading, or shrinking.
• Low Linting: Fibres must not shed particulate matter into the air, which could otherwise contaminate sterile fields or settle into open surgical cavities.
• Breathability and Fluid Resistance: Quality fabric construction ensures thermal comfort for the wearer while providing a barrier against blood and bodily fluid penetration.

For healthcare institutions and clinics looking to develop specialised uniforms, exploring blended fabrics—such as polyester-rayon or fibres engineered for industrial sterilisation—ensures uniforms deliver lasting durability and stringent safety standards. Discover more about custom manufacturing options in our factory’s bespoke scrubs manufacturing section.