(June 2010) (Learn how and when to remove this template message) Base curve radius, or simply base curve, abbreviated BCR or BC, is the measure of one important parameter of a lens in optometry. On a spectacle lens, it is the flatter curvature of the front surface.
1 Changes in stool color may be due to diarrhea; bleeding in the intestine; diseases of the intestines, liver, or pancreas; and medications.  Green stool or poop is a common stool color change. It may be due to bile pigment in the stool because diarrhea moves food too quickly thorough the intestine so the chemical can't break down, or the green color may be due to certain foods like green, leafy vegetables or green food coloring.
Why Is My Poop Green? There are many possible green poop causes. In the vast majority of cases itâs caused by consuming a lot of chlorophyll (a green pigment found in most plants). Vegetables that are rich in iron such as spinach and broccoli can also cause your stool to turn green. Excess iron in your body caused by iron supplements may have the same result. So, if you have been eating a lot of green or leafy vegetables or taking iron supplements you may already know whatâs causing your green feces.