> Blind   <ul> <li>The target will miss auto-attacks, incurring the
> message "Miss" above their attack target.</li> <li>Blind only
> mitigates the physical damage portion of an attack, including physical
> damage sourced from a physical on-hit effect. Other damage types and
> effects won't miss.</li> <li>Abilities that apply on-hit effects will
> also miss.</li> <li>Blind is considered a form of damage mitigation.
> As such, it is applied after  Thornmail's passive.</li> <li>Does not
> interrupt channeling.</li> <li>The duration is affected by crowd
> control reduction.</li> <li>The effect can be removed by all cleansing
> effects (except for Mikael's Crucible).</li> <li>Blind will not affect
> certain champion abilities.(e.g. Riven's passive Runic Blade)</li>
> <li>Champions with Blind:  Heimerdinger,  Teemo ,  Quinn and Valor,
> Shaco(non-champions only)</li>   </ul>

Taken from [the League of legends wiki](http://leagueoflegends.wikia.com/wiki/Blind#Blind).