Overview. The major passages and structures of the upper respiratory tract include the nose or nostrils, nasal cavity, mouth, throat (pharynx), and voice box (larynx). The respiratory system is lined with a mucous membrane that secretes mucus. The mucus traps smaller particles like pollen or smoke.
About more than 50 percent of optometrists received an annual salary ranging from between $70,140 and $125,460. According to the Bureau of Labor Statistics, the median hourly wage for an optometrist is around $51.42 per hour which averages to about $106,960 per annum.
The remainder worked in physicians' offices, health care stores or outpatient care centers. As of 2011, the average hourly wage for optometrists came to $51.79, or $107,720 for a year of 40-hour weeks, according to the BLS. Annual wages ranged from $51,690 at the 10th percentile to $183,980 at the 90th percentile. The BLS expects jobs for optometrists to increase by 33 percent between 2010 and 2020 as the aging population has a greater need for eye care.