This gave rise to the standard Roman depiction of the river as a powerfully built reclining god, also named Tiberinus, with streams of water flowing from his hair and beard. The River Tiber was also believed to be the river into which Romulus and Remus (the former founded Rome) were thrown as infants.
PRK was the first surgical procedure developed to reshape the cornea, by sculpting, using a laser. Later, LASIK was developed. The same type of laser is used for LASIK and PRK. Often the exact same laser is used for the two types of surgery. The major difference between the two surgeries is the way that the stroma, the middle layer of the cornea, is exposed before it is vaporized with the laser.
The excimer laser has been used for over 15 years and received FDA approval in 1998. Eye surgeons have been creating a protective flap of tissue for over 30 years. These two techniques were first combined in 1991 to create a new form of refractive surgery known as LASIK.he cornea looks untouched to the trained eye after a year. Most patients will not need any additional surgery in the decades to come after LASIK. However, 1 to 2 percent of people may have a natural drift in their need for glasses and may require a âredoâ after five to ten years.