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.
In the English language, we use many voiced sounds. That means that the vocal cords vibrate when you say that sound. The D sound is a voiced sound because the vocal cords vibrate when you make the sound. The T sound is a voiceless or unvoiced sound because the vocal cords do not vibrate when you make the sound.Instead, we use a puff of air to make the sound.The T and D sounds should be studied together because they are both stop consonants made in the same part of the mouth. Stop consonants are made when the flow of air through your mouth is stopped by either your tongue or lips. This causes a build-up of air.When the air is released, it makes a small, explosive sound.nstead, we use a puff of air to make the sound. The T and D sounds should be studied together because they are both stop consonants made in the same part of the mouth. Stop consonants are made when the flow of air through your mouth is stopped by either your tongue or lips.