What is the Optimal Distance for Surgeons to Stand from Surgical Monitors?

In modern surgery, surgical monitors —such as high-resolution monitors, endoscopic cameras, and image-guided surgery systems—have become critical tools. They provide surgeons with real-time, detailed images, enhancing their ability to make precise decisions. However, the effectiveness of these displays depends not only on the quality of the images but also on how well the surgeon can view them. One of the most important factors in this regard is the distance between the surgeon and the display. Too close, and the image can become distorted; too far, and fine details may be missed. This article explores the optimal viewing distance for surgeons based on the size of the surgical monitor to ensure clarity, comfort, and precision.

Why Does Viewing Distance Matter?

The primary concern for surgeons when viewing a surgical monitor is visual acuity. Surgeons need to see fine details, such as the texture of tissue or the location of blood vessels, which
often requires a combination of high resolution and proper viewing distance. At the same time, standing too close or too far from a screen can lead to eye strain, neck discomfort, or suboptimal visualization of critical details.

The Science Behind Viewing Distance

To determine the optimal distance, we can apply basic principles of visual ergonomics. For any display, the key factors that influence optimal viewing distance are:

• Screen size and resolution: Larger screens with higher resolutions allow for more detailed images but require the surgeon to be at an appropriate distance to appreciate this detail fully.
• Visual acuity and angle of view: The surgeon’s eyes need to be able to comfortably resolve the image while minimizing strain. Being too close to a large screen can create a situation where peripheral vision is overwhelmed by brightness, while too much distance can reduce image sharpness.
• Field of view: The field of view (FOV) refers to how much of the screen can be seen at once. A surgeon needs to be able to see both the small and large details across the screen without having to move their head excessively.
• Positioning: Surgeons should aim to maintain a neutral posture while viewing the display, with the screen at, or up to 15% degrees below, eye level to reduce neck strain.
• Lighting: Ambient lighting should be optimized to avoid glare on the screen. Dim lighting or specialized surgical lighting is ideal for contrast and focus.

Guidelines for the Optimal Distance

Based on these principles, several guidelines can be derived for determining the ideal viewing distance based on the size of the surgical monitor:

1. For Smaller Surgical Monitors (19″-26″)

• Optimal Viewing Distance: 20-28 inches
• Why? Smaller screens require the surgeon to be closer to maintain clarity and detail. The visual field is smaller, so a closer distance ensures that the surgeon can view the image in full without squinting or missing important details.
• Things to Consider: In a traditional sense the optimal viewing distance suggested is correct. However, because standard OR tables are roughly 20” wide, and standard
  hospital beds are 36” wide, achieving this distance is difficult. For this reason, facilities should consider larger surgical displays to better suit the present-day operating room.

2. For Medium Surgical Monitors (27″-32″)

• Optimal Viewing Distance: 28-40 inches
• Why? A mid-sized screen provides a broader field of view, requiring the surgeon to step back slightly. A distance of 28-40 inches helps to ensure a balance between clarity and comfort, allowing the surgeon to see the entire image without excessive head movement.
• Things to Consider: 27” surgical monitors like the NDS 90R0102 are the most common size deployed by medical facilities. With that said, similar to the smaller monitors
  mentioned above, displays in the medium size category are too small in many circumstances. Larger displays will optimize the surgeon’s view, and promote better patient outcomes.

3. For Larger Surgical Monitors (42″-58″)

• Optimal Viewing Distance: 40-71 inches
• Why? Larger displays have more pixels and a larger field of view, which makes it necessary to stand farther away to avoid visual distortion. At this distance, the surgeon can view the entire screen and perceive finer details without straining their eyes or neck.
• Things to consider: There are three frequent mounting configurations for displays in this size category: rolling cart, ceiling mounted articulating boom arm, and wall mount. Generally, displays larger than 50” such as the FSN FM-C5501DV are wall mounted, and 32” displays like the EIZO EX3242 are often deployed on carts or articulating booms. These displays offer more versatility and support larger distances between the monitor and surgical team while still maintaining a good view of the image.

Special Considerations: Surgeons and 3D Imaging

In surgeries involving 3D imaging, such as laparoscopy or robotic-assisted surgery, the ideal distance may vary slightly due to the nature of stereoscopic displays. For 3D displays, such as the FSN FM-A5505DGC, surgeons should ensure that they are standing at a distance that allows the stereoscopic effect to be fully realized. This distance is typically slightly greater than for 2D displays, and the surgeon should align their head and eyes to the optimal convergence point of the 3D display to avoid visual fatigue and maintain depth perception.

Importance of Adjustable Displays

In some surgical environments, having adjustable mounts for surgical monitors can significantly improve ergonomics. Being able to modify the height, tilt, and rotation of the display allows the surgeon to adjust the screen for both optimal viewing distance and angle. This feature helps to reduce neck and eye strain, especially during long procedures.

Conclusion

The optimal distance for a surgeon to stand from a surgical monitor is influenced by the size of the screen, with larger screens requiring greater distance to ensure the best possible viewing experience. By following the guidelines outlined in this post, surgical teams can ensure that their surgical monitors are positioned for optimal visual clarity, comfort, and efficiency. Ultimately, the ability to see fine details in real time—without straining the eyes or neck—can contribute significantly to the success of the surgery and the overall well-being of the surgeon.