Spermatozoa for fertilization are often selected by capacitation or by observation underneath the microscope in the situation of ICSI. On the other hand, there are other extra procedures that allow a better range, but that have an added cost: MACS, IMSI, PICSI, etc. The eggs are faraway from the follicles https://www.alpersismanoglu.com/en/after-ivf-failure/