Academic and practitioner
David Henson graduated in 1970 with a BSc in Ophthalmic Optics, before qualifying as an Optometrist in 1971. He went on to practice Optometry in North London before taking an MSc in Methods of Ophthalmic Investigation in 1972, and a PhD in Physiological Optics at Indiana University. After receiving his doctorate in 1976, Dr Henson took up a lectureship at Cardiff University.
Henson moved to the University of Manchester in 1996 where he worked closely with the Glaucoma team at Manchester Royal Eye Hospital and was awarded his chair in 2002.
Henson perimetry: 30 years of heritage
Drawing on his practitioner background and an academic knowledge of optics and perimetry, Henson began developing his own method of supra-threshold perimetry in 1986. The aim was to provide primary care providers with a compact instrument capable of rapidly screening the visual field for functional loss from conditions such as glaucoma.
From the early 90s onwards, Henson perimeters were used in a number of epidemiological trials investigating the prevalence of glaucoma, and in all cases assisted in the detection of significant amounts of previously undiagnosed disease.
ZATA: a unique step forward in threshold testing
During his time at Manchester Henson developed the Zippy Adaptive Threshold Algorithm (ZATA) threshold method, uniquely able to better use prior patient data to shorten test times and improve the accuracy of results in glaucoma patients with established visual field loss.
Personal and brand recognition
In 2004 Professor Henson was made a Life Fellow of the College of Optometrists. He also held the position of Honorary Secretary of the International Perimetric Society, of which he has long been a member. Henson has published over 100 academic papers along with two complete texts, Optometric Instrumentation (Butterworth Heinmann) and Visual Fields (Oxford University Press). He has supervised more than 15 PhD students and sits on the Editorial Board of Acta Ophthalmologica and Ophthalmic & Physiological Optics.
Today the Henson 9000 enjoys over 50% market share in the UK Optometry sector
Both Henson models are available for purchase via an international network of distributors.