Board Thread:Theories and Speculation/@comment-27002073-20160406173133/@comment-734582-20160413155309

SaiST wrote: There's something about the eye itself that literally records those details and allows the user to essentially "mirror" what is within their physical thresholds. Depending on how you interpret some of the things in Naruto, it's very likely that Sharingan gives literal photographic memory. When receiving Itachi's eyes Sasuke makes a mention about seeing all that he saw.

It would explain why the Uchiha are so prone to hatred. I mean, no matter how painful something was, it's impact will eventually fade to manageable levels. But for an Uchiha, every memory is as painful (or joyous) as the first time they experienced it.