When you say Retina you mean high dpi since retina is just a trade marked word for dpi of 220 inches or higher and means different things at different models.
Sorry to be a stickler but Retina is a worthless term and just causes confusion.
Sorry to be a stickler but Retina is a worthless term and just causes confusion.
Being trademarked doesn't really affect the meaning of a word once it's part of popular parlance - Kleenex, Band-Aid, Hoover, Google...
http://99designs.com/designer-blog/2013/02/26/ppi-vs-dpi-wha...