The retinal and cerebral microvasculatures share many morphological and physiological properties. Assessment of the cerebral microvasculature requires highly specialized and expensive techniques. The potential for using noninvasive clinical assessment of the retinal microvasculature as a marker of the state of the cerebrovasculature offers clear advantages, owing to the ease with which the retinal vasculature can be directly visualized in vivo and photographed due to its essential two-dimensional nature. The use of retinal digital image analysis is becoming increasingly common, and offers new techniques to analyse different aspects of retinal vascular topography, including retinal vascular widths, geometrical attributes at vessel bifurcations and vessel tracking. Being predominantly automated and objective, these techniques offer an exciting opportunity to study the potential to identify retinal microvascular abnormalities as markers of cerebrovascular pathology. In this review, we describe the anatomical and physiological homology between the retinal and cerebral microvasculatures. We review the evidence that retinal microvascular changes occur in cerebrovascular disease and review current retinal image analysis tools that may allow us to use different aspects of the retinal microvasculature as potential markers for the state of the cerebral microvasculature.

No abstract

No abstract

Objectives: Lacunar strokes account for 25% of all ischemic strokes and may represent the cerebral manifestation of a systemic small vessel vasculopathy of unknown etiology. Altered retinal vessel fractal dimensions may act as a surrogate marker for diseased cerebral vessels. We used a cross-sectional study to investigate fractal properties of retinal vessels in lacunar stroke. Methods:We recruited patients presenting with lacunar stroke and patients with minor cortical stroke as controls. All patients were examined by a stroke expert and had MRI at presentation. Digital retinal photographs were taken of both eyes. Monofractal and multifractal analyses were performed with custom-written semiautomated software. Results:We recruited 183 patients. Seventeen were excluded owing to poor photographic quality, leaving 166 patients (86 with lacunar and 80 with cortical stroke). The mean age was 67.3 years (SD 11.5 years). The patients with lacunar stroke were younger but the prevalence of diabetes, hypertension, and white matter hyperintensities did not differ between the groups. The mean Dbox (monofractal dimension) was 1.42 (SD 0.02), the mean D0 (multifractal dimension) 1.67 (SD 0.03). With multivariate analysis, decreased Dbox and D0 (both representing decreased branching complexity) were associated with increasing age and lacunar stroke subtype after correcting for hypertension, diabetes, stroke severity, and white matter hyperintensity scores. Conclusions:Lacunar stroke subtype and increasing age are associated with decreased fractal dimensions, suggesting a loss of branching complexity. Further studies should concentrate on longitudinal associations with other manifestations of cerebral small vessel disease.

Purpose To review the pathogenesis, clinical characteristics, and management of selfinflicted eye injuries. Methods Review of the medical literature. Results Psychiatric theories of pathogenesis for self-inflicted behaviour include religious and sexual ideation, symbolism, guilt, and displacement. Biological theories include disorders of serotonergic, dopaminergic, and opiate neurotransmitters. Clinical characteristics of self-mutilators include acute or chronic psychoses, drug-induced psychoses, other psychiatric conditions, and certain organic states. The majority are young-to-early middle-aged male subjects, though it can also rarely occur in children. Management of selfinflicted eye injury requires close cooperation between ophthalmologists and psychiatrists as well as other medical specialists, to ensure quick resuscitation of the patient, prompt diagnosis and treatment of any injuries, and treatment of the underlying behaviour that led to the injuries. Conclusions Self-inflicted eye injuries are a rare but important group of ophthalmic conditions that require close cooperation between different medical specialties to ensure optimum care of the often severely disturbed patient.

No abstract

Deviation of the median BC from optimality was significantly associated with general cognitive ability (g) (eta(2) = 0.034, P = 0.02) and verbal fluency (eta(2) = 0.037, P = 0.01), whereas deviation of the angle at arteriolar bifurcations from optimality was significantly associated with logical memory (eta(2) = 0.026, P = 0.03). CRAE, CRVE, and AVR did not contribute significantly to any cognitive test scores. Conclusions The association of suboptimal retinal vascular network geometry and cognition was shown in this study. It supports the concept that the retinal microvasculature acts as a surrogate marker for the cerebral microvasculature.

No abstract