Viewing distance
The minimum comfortable viewing distance for a standard computer monitor depends on screen size. A useful reference is that the screen diagonal in inches roughly equals the comfortable viewing distance in inches — a 27-inch monitor works comfortably at around 60–80 cm, while a 24-inch monitor can be positioned slightly closer at 50–70 cm.
At shorter distances, eye muscles work harder to converge on text and detail, which contributes to end-of-day fatigue. At distances beyond 90 cm, users tend to lean forward to read, reintroducing the neck strain the distance was meant to eliminate. The practical working range for most home office setups is 50–80 cm, adjusted based on monitor size and user preference.
Screen size and resolution interact: A higher-resolution screen at a given size displays finer text, which can increase the tendency to lean closer. Scaling display resolution to 125% or 150% on high-DPI screens often reduces this without requiring a physical repositioning of the monitor.
Vertical screen position
The top of the monitor should sit at approximately eye level, or slightly below it. This positions the center of the screen about 10–15 degrees below the horizontal line of sight — which corresponds to the natural resting angle of the eyes.
Monitors that are too high — a common issue with monitor stands of fixed height — require sustained upward neck extension. Monitors placed too low require neck flexion and have been associated with discomfort in the cervical region during extended work sessions.
Monitor arms solve this problem more reliably than fixed stands. Arms allow independent height and depth adjustment and can clear desk surface for other tasks. In Canadian apartment setups where desk depth is limited, a monitor arm also moves the screen closer to the wall, reclaiming usable desk space.
Laptop screens
A laptop screen on a desk places the display at a height suited for viewing distance from a face that is 30–40 cm from the keyboard — which means the screen center sits well below proper eye level. The result is sustained neck flexion across a full work day.
Raising the laptop on a stand and using a separate keyboard and mouse is the consistent recommendation from occupational health sources. The laptop hinge, when raised, allows the screen to be positioned at an appropriate height.
Screen brightness and contrast
Screen brightness should approximately match ambient room lighting. In a well-lit office environment during daytime, screens typically run at 80–100% brightness. In lower ambient light — common in Canadian winter afternoons — the same brightness level creates a high contrast ratio between the screen and surroundings that increases eye strain.
Reducing screen brightness to 40–60% in dim environments, or using automatic brightness settings on operating systems that support them, brings screen luminance closer to ambient levels. The adjustment is simple but often overlooked.
Colour temperature and blue light
Display colour temperature affects perceived brightness and eye comfort, particularly in evening work sessions. Warmer colour settings (around 3,000–4,000 K) are easier on the eyes in low-ambient-light conditions. Most current operating systems include time-based colour temperature adjustment (Night Shift on macOS, Night Light on Windows).
Blue light filtering screen protectors are available but their benefit relative to simply reducing screen brightness is not clearly established. Adjusting brightness and colour temperature costs nothing and produces measurable results for most users.
Multi-monitor setups
Two-monitor configurations are common in home offices where software development, financial work, or content creation involves reference material on one screen alongside the primary workspace on another.
For frequently-used dual monitors, the two screens should be positioned side by side with the seam between them at the user's centre-line. This positions each screen at a slight angle to the face rather than requiring a full head turn to use one. For an asymmetric setup where one screen is primary and one is used infrequently, the primary screen centres at the user's position and the secondary sits to the dominant side.
Screen angle when tilted: Monitors tilted backward (top further from user than bottom) can reduce glare from overhead lighting and place the top edge slightly closer to perpendicular with the line of sight. The recommended tilt is approximately 10–20 degrees backward from vertical, not more.
Glare and window placement
Window light behind a monitor creates a bright background that increases perceived glare from the screen. Window light falling directly on a screen creates reflections. Both degrade readability and increase visual fatigue.
In Canada, north-facing windows provide the most consistent natural light throughout the year without direct solar exposure. East and west-facing windows produce strong directional light during parts of the day. Positioning the monitor perpendicular to a window — neither facing it nor with the window directly behind the screen — minimises both problems.
For home offices with limited wall space and unavoidable window proximity, matte screen protectors reduce surface reflections. Adjustable blinds or light-diffusing sheer curtains address the background brightness problem.
Work patterns and eye breaks
A widely-cited guideline for screen work suggests looking at a distant object for 20 seconds every 20 minutes of screen time. The intent is to shift focus from near to far, allowing the eye's focusing muscles to relax. Whether the specific numbers are optimal is less important than the general practice of periodic distance-focusing breaks.
In open-plan home spaces — apartments with combined living, dining, and working areas — distance viewing is often limited. Looking out a window provides adequate distance in most cases.