The British and Irish Orthoptic Society (BIOS) is a professional body representing orthoptists in the United Kingdom and Ireland.
By 2002, it had 1,455 members, the large majority of whom were women.
Most work for the National Health Service, with a few working for private healthcare organisations, or in the Republic of Ireland.
[1] The society is a member of the Allied Health Professionals Federation and the International Orthoptic Association.
It operates a trade union wing, the British Orthoptic Society Trade Union, which is affiliated to the Trades Union Congress.