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.
Procedure. LASIK eye surgery typically takes under 10 minutes, according to WebMD. It is performed under local anesthesia. There are various types of laser technology, but the most widely used type cuts a thin flap on the cornea, which is peeled back so that its underlying tissue can be removed or reshaped by the laser.unctions. Vision impairment conditions have to do with how light focuses on the retina of the eye, which is determined by the shape of the cornea. The cornea is the window in the front of the eye, which gives it the majority of its focusing power.