An ethyl acetate extract of Opuntia ficus-indica and compounds isolated therefrom for preventing and treating brain diseases such as Alzheimer’s disease, stroke and Parkinson’s disease, cell and tissue damage caused by ischemia, or cardiovascular system disease such as myocardial infarction. The deflection coil is wound in a manner such that, after winding and baking of the coil the beginning does not have to be pulled loose from the flange, as has been customary hitherto. The end reflector is disposed at an opposite end of the eyepiece from the illumination module to reflect the CGI light back along a reverse propagation path within the eyepiece. The invention accomplishes this by incorporating mass spectral analysis into a feedback control mechanism for electroplating.