1 Visual acuity (sharpness) tests help your doctor find out if you have a problem that affects how well you can see. 2  They measure the eye's ability to see details at near and far distances. 3  The tests usually involve reading letters or looking at symbols of different sizes on an eye chart.
Amount of calcium. Elemental calcium is key because it's the actual amount of calcium in the supplement. It's what your body absorbs for bone growth and other health benefits. The Supplement Facts label on calcium supplements is helpful in determining how much calcium is in one serving.
Calcium: supplements can provide quick relief from heartburn. Calcium may also help the body in the long term: Calcium is not just stored in bones, but circulates the body in the bloodstream and helps to produce the hormones and enzymes that the body needs for regulate energy release, proper digestion, and metabolism.