His earliest publication was on mathematics, but the first that brought him notice was his An Essay towards a New Theory of Vision, first published in 1709.
In the essay, Berkeley examines visual distance, magnitude, position and problems of sight and touch.
While living in London's Saville Street, he took part in efforts to create a home for the city's abandoned children.
The Foundling Hospital was founded by Royal Charter in 1739, and Berkeley is listed as one of its original governors.
In 1709, Berkeley published his first major work, An Essay towards a New Theory of Vision, in which he discussed the limitations of human vision and advanced the theory that the proper objects of sight are not material objects, but light and colour.
This foreshadowed his chief philosophical work, A Treatise Concerning the Principles of Human Knowledge, in 1710, which, after its poor reception, he rewrote in dialogue form and published under the title Three Dialogues between Hylas and Philonous in 1713.His last two publications were Siris: A Chain of Philosophical Reflexions and Inquiries Concerning the Virtues of Tarwater, And divers other Subjects connected together and arising one from another (1744) and Further Thoughts on Tar-water (1752).Pine tar is an effective antiseptic and disinfectant when applied to cuts on the skin, but Berkeley argued for the use of pine tar as a broad panacea for diseases.Berkeley was born at his family home, Dysart Castle, near Thomastown, County Kilkenny, Ireland, the eldest son of William Berkeley, a cadet of the noble family of Berkeley. He was educated at Kilkenny College and attended Trinity College Dublin, where he was elected a Scholar in 1702, earning a bachelor's degree in 1704 and completing a master's degree in 1707.He remained at Trinity College after completion of his degree as a tutor and Greek lecturer.Berkeley is also known for his critique of abstraction, an important premise in his argument for immaterialism.Berkeley was the namesake of the city of Berkeley, California, which is most famous as the home of the University of California, Berkeley.While this work raised much controversy at the time, its conclusions are now accepted as an established part of the theory of optics.The next publication to appear was the Treatise Concerning the Principles of Human Knowledge in 1710, which had great success and gave him a lasting reputation, though few accepted his theory that nothing exists outside the mind.12 March 1685 – 14 January 1753) – known as Bishop Berkeley (Bishop of Cloyne) – was an Irish philosopher whose primary achievement was the advancement of a theory he called "immaterialism" (later referred to as "subjective idealism" by others).This theory denies the existence of material substance and instead contends that familiar objects like tables and chairs are only ideas in the minds of perceivers and, as a result, cannot exist without being perceived.