There is significant variation in revision rates depending on implant design and implantation technique. Intraocular administration is used to produce miosis after lens implantation during cataract surgery. This signaling is important in regulating the timing of embryonic implantation and uterine receptivity. The embryo becomes embedded in the endometrium in a process called implantation. In preparation for implantation of the blastocyst, the endometrium undergoes decidualization. Several embryos may be passed into the uterus to improve chances of implantation and pregnancy. Fertilization may take place in the pouch or before implantation in the water. Children may also present cases of abnormal ear canals and low ear implantation. It has usually reached the blastocyst stage at the time of implantation. During ovulation, this thickens for implantation. LPD is believed to interfere with the implantation of embryos. Gestation in seals (including delayed implantation) typically lasts a year. PGD is a form of genetic diagnosis performed prior to implantation. The levels grow exponentially after conception and implantation. Its application is important in areas such as radiation protection, ion implantation and nuclear medicine.