Sputum, or phlegm, is a mixture of saliva and mucus that youâve coughed up. Blood-tinged sputum occurs when the sputum has visible streaks of blood in it. The blood comes from somewhere inside of your body, either from along the respiratory tract or digestive system. The respiratory tract includes the: mouth. throat.
LASIK surgery is a type of refractive eye surgery. During the procedure, an eye surgeon creates a flap in the cornea, and then uses a laser to reshape the cornea and correct focusing problems in the eye.
Refractive surgery aims to correct errors of refraction in the eye, reducing or eliminating the need for corrective lenses. 1  Keratomilleusis is a method of reshaping the cornea surface to change its optical power. 2  Automated lamellar keratoplasty (ALK) 3  Laser assisted in-situ keratomileusis (LASIK)