You searched for "refraction"

2926 results found

Through the eyes of artists, part one: The effects of cataracts on Monet and Cassatt

Ophthalmology and art are undoubtedly connected – for many artists they are inseparable, as their vision is fundamental to their work – it determines how they perceive colour and light in order to transform it into art. However, visual impairment...

Game show freak

As a child of the 70s and 80s, there were limited television viewing opportunities. For the duration of the 70s there were only three channels, only moving to four with the launch of Channel 4 in 1982. Not only that,...

Designing ophthalmology services Part 3: How do we address the queues post‑COVID-19?

Part 1 of this series available herePart 2 of this series available here There is going to be enormous demand on ophthalmology services as they start to welcome patients back. The authors explain how modelling can help make the most...

The management of retinal vein occlusions: a summary

Retinal vein occlusions (RVO) are the most common cause of visual loss from retinal vascular disease second to diabetic retinopathy. Vision is lost due to ischaemia, macular oedema and / or haemorrhage which ultimately effects a patient’s quality of life...

Visual disturbance heralding stroke: are we seeing the signs in time?

Isolated visual symptoms may be an early presenting feature of stroke, and timely recognition of such atypical cases is important because treatment for stroke has a limited time-window of efficacy. Stroke occurs in approximately 150,000 people per year in the...

A brief history of colour vision

Andrew Want takes a look at how colour vision has evolved in humans and animals and how it differs across species. Colour vision is something that we often take for granted, but it has become so intrinsic to the way...

Systemic sarcoidosis presenting with acute myopia and angle closure

Case report A 40-year-old Asian man presented to the Emergency Department with a one day history of sudden onset visual disturbance in his right eye. He complained of image distortion and noted that objects now appeared smaller. He also described...

Recurrent unilateral preseptal cellulitis secondary to herpes simplex virus infection

Introduction Periorbital (sometimes called preseptal cellulitis) is a common condition which on its own is not normally an ophthalmic or surgical emergency, however it has the potential to cause severe and serious morbidity in cases where the infection has crossed...

What’s trending Feb/Mar 2026

A round-up of the eye-related hot topics that have been trending on social media over the last few weeks. #Darts #AlyPaly It always looks like an electric atmosphere at Alexandra Palace for the World Darts Championship, and the 2025/2026 competition...

Part 1: Her Royal Highness The Duchess of Edinburgh Visits Ethiopia with Orbis

Her Royal Highness The Duchess of Edinburgh, visited services protecting the vision of children and adults in Hawassa, Ethiopia, with international eyecare charity Orbis.

Aug/Sep 2016 Quiz

History A 45-year-old female patient presented with left upper eyelid swelling present for six months. There was mild pain and a sense of fullness over the left eye. Examination revealed a palpable firm mass over the lacrimal gland area without...

2018 update on intravitreal injections

In this review article the authors have highlighted the standardised and structured approach to intravitreal injections (IVI) by examining the recent evidence-based literature. IVI is the most commonly performed procedure worldwide with low potential risk of endophthalmitis. IOP spikes are...