Unfortunately with ME our eyes can be varying all the time and what the optometrist finds one day may not be what is going on much of the rest of the time. Optometrists can often get confused with us as far as things like glasses go.. finding we need one strength one time but our eyes may be fine another day. With ME often the best treatment for blurred vision is the rest the eyes eg shut them....doing eye exercises may make the vision worst. Be aware that also some low blood flow to head also can be affecting the eys and causing blurred vision too. If that is the case laying down could also help.