(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.
As digested matter and waste move through the colon it will turn from green to yellow and eventually to brown â which is the normal color for a stool. So, green poop can mean your stool has moved through your system too quickly for the bile to change it from green to brown. In medical circles this is often referred to as ârapid transit timeâ. Thatâs why diarrhea can look green because it goes through your digestive far more quickly than a normal stool.