Fumaric acid or trans-butenedioic acid is the chemical compound with the formula HO 2 CCH=CHCO 2 H. This white crystalline compound is one of two isomeric unsaturated dicarboxylic acids, the other being maleic acid.umaric acid has been used a food acidulant since 1946. It is approved for use as a food additive in the EU, USA and Australia and New Zealand. As a food additive, it is used as an acidity regulator and can be denoted by the E number E297.
eye doctor, ophthalmologist, optician, optometrist (see synonym study at the current entry) Synonyms. The term eye doctor refers generally to an ophthalmologist, but is also used informally (and imprecisely) in referring to an optometrist. An ophthalmologist is a physician who specializes in the diagnosis and treatment of diseases of the eye.
An optometrist is an eye doctor who has earned the Doctor of Optometry (OD) degree. Optometrists examine eyes for both vision and health problems, and correct refractive errors by prescribing eyeglasses and contact lenses. Some optometrists also provide low vision care and vision therapy.n optician is not an eye doctor, but opticians are an important part of your eye care team. Opticians use prescriptions written by an optometrist or an ophthalmologist to fit and sell eyeglasses, contact lenses and other eyewear.