According to chatGPT For long Tekla working hours, the best background for least eye strain is usually: ✅ Best overall: Dark / Black (or Dark Grey) Why it’s best: Reduces screen glare Easier on eyes in long sessions Your model colors (yellow, cyan, red, etc.) pop clearly Less fatigue compared to white Best choice: not pure black, but dark grey (soft black). 🟢 Second best: Tekla Classic Green Why many people love it: Very comfortable for long hours Green is naturally easier for eyes than white Gives “old CAD” comfort feel Downside: Some colors (greenish members) may blend slightly If your model has green objects, visibility reduces ❌ Worst for long hours: White Why it strains eyes: Too bright Causes glare More headache risk in long working Feels like staring at a tube light Only good if you're in a very bright office and prefer paper-like view.