What is the ruling on covering the face and the description of the legitimate abaya, and is it permissible for a female doctor to examine men in the presence of another patient, and what is the ruling on a husband asking his wife to stop examining men and to wear an abaya with a face covering?

The niqab does not prevent a female doctor from doing her work, and it is permissible for her to uncover her face out of necessity. The basic rule is to prevent a female doctor from treating men unless there is a necessity, such as the absence of a male doctor. What you requested from your wife is correct, and we encourage both of you to uphold it.