1. Question: Why can a blind person say Kiddush Levana with others outside but a sick person stuck in bed cannot say Kiddush Levana if he only sees the shine from the moon through his window according to the Responsa Zera Emes (volume 3 chapter 43)?
A. If the sick person can see the moon itself from his window he can technically make Kiddush Levana because being outside is only better because it’s like going out to greet the king (Hashem) which shows more respect.
B. In the Mishna Berura (426:1) the Rema says one should not say Kiddush Levana unless it is night and he can benefit from the moon’s light. This means that this blessing is a blessing over getting satisfaction like by food, not a blessing over a mitzvah.
Answer: The blind person got as much benefit from the moon as he can get by the person next to him informing him that the moon is out but the sick person has the ability to get the full benefit of the moon he is just incapacitated at the moment so he cannot make the blessing if he does not actually get the full benefit of seeing the moon.