(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.
The normal color of stool or feces is generally light to dark brown. Stool gets its color from bile, which is a yellow-green fluid produced in the liver that helps to digest your food.As food passes through your digestive tract, digestive enzymes break down the bile, resulting in various shades of brown stool.reen stool can also be caused by taking iron supplements or eating certain foods such as green leafy vegetables. Green stool can also indicate a problem with food digestion due to a disease, disorder or other abnormal process.