An optician is the name given to people who are trained to fill prescriptions for eye correction in the field of medicine, also known as a dispensing optician or optician, dispensing. In the US an optician is defined as someone who only makes and dispenses eyeglasses and other eye correction, and does not perform medical test, those being the duties of a optometrist or ophthalmologist. Optician has also been a term for people skilled in the design or fabrication of all types of optical devices, a field more formally referred to today as optical engineering.