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The standard guillotine-shaped vitreous cutter blade (hereafter named Regular Blade [RB]) did not substantially change over the past 40 years, because of its simple and robust design. The asynchronous suction and cutting action, typical of RB blades, determines complete port obstruction generating flow instability and fluid acceleration that results in(More)
PURPOSE Primary blast injury (PBI) mostly affects air-filled organs, although it is sporadically reported in fluid-filled organs, including the eye. The purpose of the present paper is to explain orbit blast injury mechanisms through finite element modeling (FEM). METHODS FEM meshes of the eye, orbit, and skull were generated. Pressure, strain, and strain(More)
The aim of this study was to evaluate axonal transport along the optic pathways of neonatal rats in which oxygen-induced retinopathy had been experimentally produced. One group of 116 rats was exposed to an FiO2 of 80% for the first 5 days of life and then kept under room-air conditions for the following 10 days. A second group of 108 rats was maintained(More)
PURPOSE To characterize the fluidics of vitreous cutter port in response to aspiration and blade motion using particle image velocimetry techniques. Diverse surgical scenarios and fluid characteristics were replicated. METHODS The 23-gauge vitreous cutters were immersed in seeded Balanced Salt Solution (BSS) (Alcon, Forth Worth, TX) or egg albumen, and(More)
The purpose of this study was to establish whether exposure to intense lighting favors the development or aggravates experimental oxygen-induced retinopathy in the new-born rat. Five groups of Wistar rats were studied. The control group was maintained for the first 14 days of life under conditions of cyclical (12L∶12D) lighting at 12 Lx in room air. Two(More)
PURPOSE To calculate the reliability of an eye-dedicated triaging system named Rome Eye Scoring System for Urgency and Emergency (RESCUE). METHODS There were four coding parameters: pain, redness, loss of vision, and risk of open globe. Each parameter is assigned a score, the sum of which allows color coding. There were 1000 consecutive patients divided(More)
The authors examine a family, in which two brothers were affected by a severe expression of arteriohepatic dysplasia (ADH, Alagille syndrome), an autosomal dominant disorder associated with intrahepatic cholestasis, characteristic facial appearance, congenital embryotoxon. One of these two cases presented a keratoconus and both had retinal pigmentary(More)
Knowledge of vitreous motion in response to saccades is a prerequisite for understanding vitreous rheology. Purpose of present paper is to introduce Ultrasound Image Velocimetry of the human eye, measure scleral and vitreous velocity fields and test the reproducibility of the proposed technique. Twelve patients with varying diagnosis underwent Ocular(More)
PURPOSE We report on instantaneous volumetric flow rate of vitreous cutters measured by means of particle image velocimetry (PIV). METHODS In an in vitro experimental study, vitreous cutters mounting a regular blade (RB) or modified Twedge blade (TB) engineered for higher flow were connected to a console machine equipped with a double peristaltic and(More)