The Dragonflies and Damselflies (Insecta: Odonata) of Canada: species list, geographical distribution, status, and conservation ranks.

As of August 2023, 220 species in 57 genera and 10 families of damselflies and dragonflies (Insecta: Odonata) are recorded for Canada. Since the publication of the first edition in 2005, 14 species have been added to the list; one,Neurocordulia obsoleta (Say) has been removed because of a misidentification and another, Sympetrum occidentale, has been to synonymy. Conservation ranks are given for species in all 13 provinces and territories.

Is diabetic retinopathy screening worthwhile among people first diagnosed with diabetes at older ages? A cohort study of Norfolk diabetic retinopathy screening programme.

Aims: England's Diabetic Eye Disease Screening Programme offers screening to every resident over age 12 with diabetes, starting as soon as possible after diagnosis and repeated annually. People first diagnosed with diabetes at older ages have shorter life expectancy and therefore may be less likely to benefit from screening and treatment. To inform decisions about whether diabetic eye screening policy should be stratified by age, we investigated the probability of receiving treatment according to age at first screening episode.

Frequency of visual involvement in a 10-year interdisciplinary cohort of patients with giant cell arteritis.

Background: We present the largest study of the frequency and nature of visual complications in a cohort of 350 patients consecutively diagnosed with giant cell arteritis (GCA).

Methods: All individuals were assessed using structured forms and diagnosed using imaging or biopsy. A binary logistic regression model was used to analyse data for predicting visual loss.

Incidence and progression of diabetic retinopathy during 17 years of a population-based screening program in England.

Objective: To estimate the incidence of diabetic retinopathy in relation to retinopathy grade at first examination and other prognostic characteristics.

Research Design And Methods: This was a dynamic cohort study of 20,686 people with type 2 diabetes who had annual retinal photography up to 14 times between 1990 and 2006. Cumulative and annual incidence rates were estimated using life tables, and risk factors for progression were identified using Cox regression analysis.

Use of PCR to diagnose Toxoplasma gondii chorioretinitis in eyes with severe vitritis.

Two cases are reported of intraocular inflammation in which severe vitritis hampered the fundal view, making an accurate clinical diagnosis impossible, and vitreous analysis using conventional techniques was unhelpful. PCR for Toxoplasma gondii was positive in both cases and provided the only way of confirming the diagnosis. Other ocular samples also underwent PCR for Toxoplasma DNA and the specificity of this approach is demonstrated.