I'm writing an application that deals with blind studies. What would be the correct term to use when describing whether or not a study is blind? No matter which word I use it always ends up sounding awkward so I'm wondering what the correct term would be.

• Blindedness
• Blindness
• Blind
• Masked (?)

Also, is it correct usage to describe users as partially or completely "blind" or "blinded"?

I'm writing an application that deals with blind studies. What would be the correct term to use when describing whether or not a study is blind? No matter which word I use it always ends up sounding awkward so I'm wondering what the correct term would be.

• Blindedness
• Blindness
• Blind
• Masked (?)

I am also looking for the opposite words, for example, is it correct usage to describe users as "blind/unblind" or "blinded/unblinded"?