You searched for "visual field"

56 results found

Stem cell therapy for Parkinson’s disease: researching for an 
effective cure

Neurodegenerative diseases are characterised by the chronic and progressive loss of neurons, which in turn results in loss of cognitive and physical functions. The World Health Organization has estimated that the disability-adjusted life years lost from neurological disease was about...

The interpretation and use of ultrasound biomicroscopy (part 1)

Ultrasound Biomicroscopy (UBM) has become increasingly important for the diagnosis of a variety of anterior segment pathologies. Most ophthalmologists are familiar with conventional B-scan ultrasonography techniques, which operate at lower sound frequencies (7.5 to 20MHz). UBM is an ultrasound technique...

Quiz Dec/Jan 2023

History A 35-year-old female presented to the emergency eye clinic with an acutely red, painful, photophobic left eye. She was a contact lens-wearer but denied swimming, showering, or sleeping in her lenses. She resided on a farm and worked as...

A unique case of macular burn from ‘toy’ laser

The first laser was created in 1960 and its name is an acronym for ‘light amplification by stimulated emission of radiation’. Laser technology has been used for medical, industrial, research and entertainment purposes in a variety of fields following extensive...

Papilloedema: an update

Some readers may have seen a recent report in the national newspapers of the case of a teenage girl with persistent severe headache associated with a fatal brain tumour having been undiagnosed despite many consultations with her medical advisers. It...

The last three patients: general practice (Patient One)

Professor Jonathan Rees is an Emeritus Professor of Dermatology at the University of Edinburgh (2020). He held the Grant Chair of Dermatology in Edinburgh from 2000 to 2020, and before that the Chair of Dermatology in Newcastle from 1992 to...

OCTA in diabetic macular oedema treated with intravitreal aflibercept (DOCTA Study)

Central vision loss due to diabetic macular oedema (DME) can be attributed not only to presence of the macular oedema itself but also, in some cases, to alterations of the foveal avascular zone (FAZ). The DOCTA trial was a longitudinal,...

Embryology in clinical practice

The fascinating world of embryology is both beautiful and practical. It is a home video of our evolutionary history through the ages from the single cell through to the life aquatic, the development of gut, limbs and brain, and most...

In vivo confocal microscopy, principles and use in keratitis Part 1: Principles

In 1968 Maurice introduced the concept of high powered specular microscopy, it was in that very year that the first scanning confocal microscope was proposed. Marvin Minsky developed the first confocal microscope in 1955 named the ‘double focusing scanning microscope’....

Adaptive optics imaging: resolving single cells in the living eye

The human retina is unique in the central nervous system (CNS) in that it can be directly visualised non-invasively. Technological advances of several imaging modalities, including optical coherence tomography (OCT), multichannel scanning laser ophthalmoscopy (SLO) and fundus photography, have afforded...

Understanding and confronting bacterial endophthalmitis

Abdus Samad Ansari highlights the importance of early recognition of this condition using an unusual presentation. Endophthalmitis is a medical emergency with devastating consequences. Despite adequate treatment, severe cases frequently result in permanent blindness. Endophthalmitis involves inflammation of both the...

25 years of OCT

David Huang first described optical coherence tomography (OCT) in 1991, in his seminal paper on the subject in Science. This method developed the work of others on ophthalmic interferometry, which essentially showed that measuring reflected light could be used to...