In the technology era, companies are constantly launching 4K or higher screens, but whether the human eye really sees the difference is still a concern for many people.
A research team from the University of Cambridge and Meta reality Labs has just announced a new method, accurately measuring vision and vision, published in the journal Nature Communications.
Snellen charts, a traditional vision checking tool that has been used for more than 160 years, have never been tested on modern screens.
Maliha Ashraf, a research fellow at Cambridge, emphasized: This measurement has never been done on modern digital screens, but has been based on a 19th-century lettering system.
The research team replaced the Snellen board with a smart digital device that could move the screen to accurately measure what the eye sees.
Instead of relying on the total photo scores of the screen, they use the photo scores per degree (PPD), measuring the photo scores at a medium level in view.
This is a personalized measurement that clearly determines the sharpness that a person notices from their own viewing position.
In the experiment, volunteers observed different models on the screen, from gray to color, when the screen moved closer, further away or to the side to check peripheral vision.
The results showed that the human eye usually sees better than the 20/20 standard (equivalent to 60 PPD), but the accuracy depends on each individual and the subject being viewed.
These findings are important for the display technology industry.
It suggests that increasing the resolution from Full HD to 4K may not be necessary for the human eye, while helping to save energy and resources in production.
Scientists expect the PPD method to support screen design and optimize personal visual experience in the future.
