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.
During a lumbar puncture, a hollow needle is inserted through the skin in the lower back. The needle passes between the vertebrae and into the spinal canal. A lumbar puncture can be used to: collect CSF for testing to detect disease conditions. measure CSF pressure to detect hydrocephalus.