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.
Bifocals are two lenses in one. One part, or segment (usually the bottom), is made to adjust the eye for close focus, and the other (top) has a different strength for distant focus. The key to wearing bifocals is to learn to automatically look through the proper part of the glass.