Q. If I am dating or married to someone who is physically infirm or has a visual impairment, is it a violation of shomer negia to help guide them if no one else is available, even in public? Does it matter whether or not I am a nidda?

A. Poskim maintain That in such a case one should use a separating cloth for the companion to hold on. The above applies to a doctor or nurse also.
Horav Shlomo Miller’s Shlit’a opinion is similar.

Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a