Salaries. The U.S. Bureau of Labor Statistics provides salary data for both optometrists and physicians. According to its May 2011 figures, the average income for optometrists was $107,720 per year. That same figure, for physicians and surgeons, was $184,650.
In phonetics, a vowel is a sound in spoken language, with two competing definitions. In the more common phonetic definition, a vowel is a sound pronounced with an open vocal tract, so that the tongue does not touch the lips, teeth, or roof of the mouth, such as the English ah /ÉË/ or oh /oÊ/. There is no build-up of air pressure at any point above the glottis.
Vowels form one of the two principal classes of speech sound, the other being that of consonants. Vowels vary in quality, in loudness and also in quantity (length). They are usually voiced, and are closely involved in prosodic variation such as tone, intonation and stress. Vowel sounds are produced with an open vocal tract. The word vowel comes from the Latin word vocalis, meaning vocal (i.e. relating to the voice). In English, the word vowel is commonly used to refer both to vowel sounds and to the written symbols that represent them.