Optimal Reading Distance Calculator
Ergonomics-based: calculates the minimum healthy limit based on font size.
Real-time preview: adjust zoom and see the text at actual size.
Risk traffic light: shows whether your configuration is high risk, ideal or safe zone.
Ergonomic tip: guides you to increase zoom instead of leaning in.
# Optimal Reading Distance: Protect Your Vision in the Digital Age
We spend an average of eight to ten hours a day in front of screens. Whether working on a laptop, scrolling social media on a phone or watching series on a tablet, our eyes are under constant strain. One of the most critical factors for avoiding computer vision syndrome and progressive myopia is reading distance. The exact figure depends entirely on the font size you are consuming.# The Science Behind Visual Distance
The human eye works similarly to a camera. To focus on nearby objects, the ciliary muscle must contract to change the shape of the lens — a process called accommodation. If you spend hours with the ciliary muscle contracted because text is too close or too small, it fatigues, causing what is known as asthenopia or eye strain.The Visual Rest Rule
To complement good reading distance, every 20 minutes look at an object 20 feet (about 6 metres) away for at least 20 seconds to relax your focus.# Factors That Determine Your Ideal Distance
- Pixel density (PPI): on high-resolution screens, text is sharper but physically smaller.
- Contrast: grey text on a white background forces the eye closer than pure black text.
- Ambient lighting: low light causes the pupil to dilate, reducing depth of field.
- Presbyopia: with age, the lens loses elasticity and the minimum focus distance increases.
# Tips for Healthy Reading
- Increase zoom: do not be afraid to set your browser to 110% or 125%. Larger text means you can sit further from the monitor.
- Adjust monitor height: the top edge should be at or slightly below eye level.
- Avoid excessive brightness: your screen should not be a lamp. Adjust brightness to match a white sheet of paper.
- Blink deliberately: make a conscious effort to blink when your eyes feel heavy.