Individual pixels are plainly visible to all users regardless of visual acuity. Text edges are jagged, gradients show a pronounced screen door effect, and diagonal lines staircase noticeably. This range is generally unsuitable for text-heavy or detail-oriented work.

Whether this looks sharp depends on your eyesight. Users with 20/25 vision have a personal retina threshold near 47 PPD. Users with average 20/20 vision may notice slight pixelation on fine text or thin lines.

Centered on the ~57 PPD retina threshold — the point at which the human eye can no longer reliably distinguish individual pixels at a normal viewing distance (the principle behind Apple's Retina Display). This window accounts for variation in visual acuity and viewing conditions.

Just past the threshold for most users. Those with 20/20 or 20/25 vision will perceive no difference from the green range. Users with sharper 20/15 vision, whose personal threshold sits near 75 PPD, may notice a slight improvement.

Well past the retina threshold for virtually all users, including those with 20/15 vision. Antialiasing quality may improve marginally, but perceived sharpness cannot increase beyond what the eye can resolve. You are paying for — or rendering — pixels that cannot be seen.