In this chapter, we will cover how to correctly adjust the eyepieces, including how to use an adjustable eyepiece, in order to get the clearest field of view. Many users, in their excitement to see their sample, neglect the eyepiece. One of the most common complaints I have heard from beginners is that they find eyepieces uncomfortable to use. This is usually because they are not positioned correctly. In this chapter, we will discuss how to have correct interpupillary distance, how to adjust the height of the eyepieces for comfortable viewing, and how to make using eyepieces more comfortable for glasses wearers.