A US Navy<unk>  adjusting a customer's glasses Trial frame and lenses An<unk> , or dispensing<unk> , is a technical practitioner who designs, fits and dispenses lenses for the correction of a person's vision.<unk> s determine the specifications of various ophthalmic appliances that will give the necessary correction to a person's eyesight. Some registered or licensed<unk> s also design and fit special appliances to correct cosmetic, traumatic or anatomical defects. These devices are called shells or artificial eyes. Other registered or licensed<unk> s manufacture lenses to their own specifications and design and manufacture spectacle frames and other devices. Corrective ophthalmic appliances may be contact lenses, spectacles lenses, low vision aids or ophthalmic prosthetics to those who are partially sighted. The appliances are mounted either on the eye as contact lenses or mounted in a frame or holder in front of the eye as spectacles or as a monocle.<unk> s may work in any variety of settings such as joint practice, hospitals, laboratories, eye care centers or retail stores. However, registered<unk> s have to meet standards of practice and training, commit to ongoing education, hold professional liability insurance and are held to these standards by their respective regulating bodies. There are<unk> s in the navy and army. Military<unk> s serve active duty members, veterans, and dependants. A fully credentialed<unk>  in the United States is college educated in Optical Science and is known as an Ophthalmic<unk> ® (O.O.) and they are credentialed by the Society to Advance<unk> ry (SAO). To achieve this nationally registered title an<unk>  must achieve a combination of a college education, American Board of<unk> ry and National Contact Lens Examiners advanced certifications, or maintain their state license in both eyewear dispensing and contact lens fitting when applicable. In the United Kingdom, an ophthalmic<unk>  was the term previously used for those who practiced optometry and has now been replaced by optometrist. Professional regulation remains with the General Optical Council under the provisions of the<unk> s Act 1989. Like many health care providers,<unk> s are regulated professionals in certain countries. The profession is often regulated by<unk> -specific agencies, as in Canada and some states of the U.S., or jointly with optometry such as the New Zealand Optometrist and Dispensing<unk> s Board or the General Optical Council in the United Kingdom.<unk> s may work independently or dependently with an optometrist or ophthalmologist although some<unk> s may work in an optical laboratory as a laboratory technical<unk> .<unk> s convert a prescription for the correction of a refractive error into an ophthalmic lens or some other device, such as reading aids or telescopic lenses.
Optician
Olfactory trigone
Syrinx 
Voxelotor
Ateronon
Optic vesicle
Lunatic
Olfactory nerve