Embryo implantation in humans. After fertilization the human embryo begins a 4 day long journey down the fallopian tube and into the uterus. When the embryo reaches the blastocyst stage it develops two distinct populations of cells. The outer cell mass,called the trophectoderm, and the inner cell mass.
Cat eye glasses. Named after their resemblance to the shape of a cat's eye, cat eye glasses are probably the most popular style of vintage eyeglasses. Though cat eye glasses were around since the 1950's, they reached their peak popularity when Audrey Hepburn wore a pair in the 1961 film Breakfast at Tiffany's.
But replacing the cloudy cataract with a conventional artificial lens will at least improve their vision to some degree. Q: Can cataracts be prevented? A: Good question. There are many places in the world where cataract surgery isnât available. As a result, an estimated 20 million people worldwide are totally blind from cataracts. So if you could delay the onset of this aging change, you might prevent severe vision loss in a significant number of people.