New Delhi, Oct. 28 -- For more than a decade, Apple's "Retina Display" has been the yardstick for screen sharpness. This tech is marketed as being so crisp that the human eye simply can't pick out individual pixels. That mantra shaped everything from iPhones to MacBooks, cementing the 60 pixels per degree (ppd) "retinal resolution" as a gold standard. But new research from Cambridge and Meta, just published in Nature Communications, reveals the bar was set too low.

Turns out, the average human eye among healthy, younger adults can spot up to 94 pixels per degree for high-contrast images and text. That's almost 50% sharper than the so-called cut-off Jobs popularised. A few standouts in the study hit an eyebrow-raising 120 ppd. Even Apple'...