2 levels, 1 point per level
One or more of the character's senses (sight, hearing, taste, touch, smell) is either diminished or completely gone. An example of a diminished sense is being near-sighted or hard of hearing. Characters with a diminished sense are at -3 to make perception checks with that sense, unless they have a non-permanent way of overcoming it. (For instance, a near-sighted character could wear glasses to avoid the perception penalty, as long as it was possible for the glasses to get lost or broken.) In the event that more than one sense is diminished or lost, add 1 point to the total value of the defect for each one after the first.
Level One: A sense is diminished.
Level Two: A sense is completely gone.