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 the quad marker screen, a sample of blood is taken from your vein. Substances in the blood sample are measured to screen for: Problems in the development of the fetus's brain and spinal cord, called open neural tube defects; the quad marker screen can predict approximately 75%-80% of open neural tube defects.