The son of James Hartridge, of Yalding, Kent; educated at King's College Hospital, acted as Clinical Assistant at the Royal London Ophthalmic Hospital, then as Assistant Surgeon to the Central London Ophthalmic Hospital. Afterwards he became Surgeon and later Consulting Surgeon to the Westminster Ophthalmic Hospital, also Ophthalmic Surgeon and Lecturer on Ophthalmic Surgery to Westminster Hospital. He was also Consulting Ophthalmic Surgeon to St Bartholomew's Hospital, Rochester. At the Annual Meeting of the British Medical Association in 1889 he was Secretary of the Ophthalmic Section, and Vice-President of the Section at the Newcastle Meeting in 1898. He died at his house, 12 Wimpole Street, on September 8th, 1923. He was amongst the earliest to specialize in ophthalmic practice, for he devoted himself more especially to the subject of errors of refraction. Publications: *The Refraction of the Eye*, 1884. There were 16 English, besides American editions. It was the most widely popular students' text-book of the time, and was incorporated with *Diseases and Refraction of the Eye*, by N C MACNAMARA and G HARTRIDOE, which reached a 5th edition in 1891. Small books on the Ophthalmoscope and Retinoscopy. Translation of Schweigger's *Clinical Investigation of Squint*, 1887.