The CSF shunt valve includes an elongate, hollow housing and a valve unit disposed within the housing. The presence, location and morphological characteristics of a meiotic spindle in the oocyte can then be determined based on the spindle structure in the retardance image, and the developmental potential of the oocyte can be evaluated. The SOI wafer including an insulator layer and an upper silicon layer. The result customization application performs transformations on the response data to generate a result set conforming to the result set definition.