Townsend, Middlesex County, Massachusetts, United States road map, satellite view, street view, terrain map, photos... Townsend, MA is situated at 42.67Â° North latitude, 71.71Â° West longitude and 91 meters elevation above the sea level.
Time of Flight. The simplest way to think about âtime of flightâ laser scanning is to look approach it as nothing more than a laser range finder. I think we all understand how a laser range finder works. It basically measures a distance by shooting a laser beam out to an object and measuring how long it takes that laser beam to bounce back.
Like LASIK and other types of laser eye surgery, PRK works by reshaping the cornea using an excimer laser, allowing light entering the eye to be properly focused onto the retina for clear vision. The main difference between PRK and LASIK is the first step of the procedures.