On this page: LASEK vs. LASIK â¢ LASEK vs. PRK â¢ What to expect during and after LASEK surgery â¢ Risks and complications. LASEK eye surgery is a variation of PRK to correct myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. LASEK combines certain methods from both LASIK and PRK. LASIK remains the most popular laser eye surgery, but for people who are not suitable LASIK candidates, PRK or LASEK may be better options and produce comparable outcomes to LASIK.
Sound is actually produced by the pressure changes created when small jets of air pass through moving vocal cords. This is why it can be helpful to think of breath control as the steam engine that makes the machinery of singing function.) A vocal fold. The picture above is a microscopic illustration of the vocal cords.
The lung (the pump) must produce adequate airflow and air pressure to vibrate vocal folds (this air pressure is the fuel of the voice). The vocal folds (vocal cords) are a vibrating valve that chops up the airflow from the lungs into audible pulses that form the laryngeal sound source.he voice consists of sound made by a human being using the vocal folds for talking, singing, laughing, crying, screaming etc.