1 Frequently, too much LDL is the result of a diet rich in saturated fats (usually from animal foods such as beef, butter, lard, and whole-milk dairy products) and trans fats (found in processed and fast foods).
Although most bifocals and trifocals have visible lines at the border of lens segments, there is a blended round-seg bifocal that has a less noticeable near segment than its regular round-seg cousin. The near seg is blended into the distance portion of the lens so that it is virtually invisible.
A lumbar puncture is most commonly performed to measure the pressure within the CSF and to collect a sample for further testing. The CSF can be evaluated for color, blood cells, bacteria, malignant cells, glucose, protein and many other chemical changes.