Retina Display
Retina Display models
Columns: Model | PPI (pixels per inch ) | ppcm (pixels per cm ) | Resolution | Typical viewing distance (in/cm) | Pixels per degree (PPD)
iPhone 4 / 4S and iPod Touch (4th generation) | 326 | 128 | 960×640 | inches (cm) | 57 | iPhone 5 / 5S / 5C and iPod Touch (5th generation) | 326 | 128 | 1136×640 | inches (cm) | 57 | iPad ( 3rd / 4th generation / iPad Air ) | 264 | 105 | 2048×1536 | inches (cm) | 69 | iPad Mini (2nd generation) | 326 | 128 | 2048×1536 | inches (cm) | 85 | MacBook Pro with Retina Display 15" | 220 | 87 | 2880×1800 | inches (cm) | 77