A glass eye or contact lens in a mikvah

Hi,

We have said that ritual immersion in a mikvah requires that the water be able to reach every part of the body. An interruption between the body and the water is called a chatzitzah.

Parts of the body which are normally concealed (beit hastarim) must also be open to water, but an interruption only consittutes a chatzitzah if it is of the sort of material that normally adheres to a surface. Therefore, a glass eye does not constitute a chatzitzah.

For the same reason, contact lenses do not constitute a chatzitzah if one left them in while immersing, but it is appropriate to remove them before immersing if possible.

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:104)

Have a great day,
Mordechai