If your eyes feel tired by mid-afternoon, lighting is often the quiet culprit. Overhead fluorescents wash out contrast, while a single bright lamp can create hotspots on the desk.
Prefer adjustable task light
A desk lamp with dimming and a flexible arm lets you light paperwork without blasting the monitor.
Watch color temperature
Neutral white (around 4000K) works well for most desks. Very cool light can feel clinical; very warm light can make reading harder.
Reduce bounce glare
Position the lamp to the side of your dominant hand so your hand does not cast a shadow across the page.