Extended-wear contact lenses can be left in for up to thirty days. As it goes, I am near sighted. The clarity of the computer screen relies not only on its resolution but on my capacity to subtract circumambient environmental noise. Sometimes it becomes clear that the noise is the only thing of interest. I have never worn contact lenses. I like the option of taking my glasses off and being forced to focus on what comes immediately in front of my face, or putting them on and looking elsewhere.