Eyebright herb can easily be found in most health or natural food stores. It is available in teabags, loose dried leaves, powder, liquid, tablets, capsules, tincture, and oil. It is also occasionally packaged with dried bilberries which is also used in the treatment of eye related conditions.
Learner's definition of PREDICTIVE. [more predictive; most predictive] formal. : making it possible to predict what will happen : useful in the prediction of something. The test does not have much predictive value. High blood pressure is predictive of future heart problems.
Specificity refers to noncases not being reported as cases. Predictive value positive is the proportion of reported cases that truly are cases. A flexible system can adapt to changes in disease occurrence, or in changes in the reporting system, and still continue to function.