Search results for "Miosis"

Matemática y semiótica en el aula: un punto de vista necesario

2014

Síndrome de Horner como manifestación de disección carotídea

2011

Caso Clínico: Un varón de 42 años se presenta con ptosis y miosis izquierda después de una historia de cefalea homolateral de 20 días de evolución, que empeora progresivamente durante los últimos días. Una angioresonancia revela disección de la arteria carótida interna. Discusión: El «síndrome de Horner doloroso» destaca como una urgencia médica por posible manifestación de una disección carotídea. Consideramos que el perfecto conocimiento de las urgencias neurooftalmológicas es de gran necesidad para el médico oftalmólogo y que estas requieren una atención multidisciplinaria para asegurar un seguimiento y tratamiento adecuado. Clinical Case: A 42-year-old man presented with ptosis and mios…

From Extensity to Protensity in CAS: Adding Sounds to Icons

2009

Being aware of the gap between technological offers and user expectations, the paper aims to illustrate the necessity of anthropocentric designs ("user-pulled") and to reveal the dangers of current ICT designs ("technology-pushed"). Since the gap is deepened because of insufficient innovative use of new agent-oriented technology potential, an affordable manner to "invent new Computer-Aided x" application domains is proposed. To substantiate the approach, the domain must be challenging, easy to implement and "as humanist as possible": Computer-Aided Semiosis (CAS). On this background, the paper also presents a new and challenging concept in IT applied research, borrowed from psychology and m…

Parlare per ascoltarsi. Note su alcuni aspetti dell'interlocuzione.

2015

This paper considers the nature of interlocution from the point of view of three different research programs: the theory of enunciative operations of Antoine Culioli (or toe), the psychoanalysis of Jacques Lacan (or pla) and the enactive grammar of Didier Bottineau (or ge). It is composed of three parts: in the first part, we introduce some definitions of interlocution in order to distinguish between terms and empirical supports of interlocution. The second part is devoted to the analysis of some sensorial operations that are at work in the context of verbal inter- action – with particular reference to the cases of acoustic feedback. Finally, in the last part we discuss in which sense and u…

Accommodation-related changes in monochromatic aberrations of the human eye as a function of age.

2008

PURPOSE. To investigate the relationship between accommodation and the optical aberrations of the whole human eye, as a function of age. METHODS. Sixty healthy subjects with spherical ametropia in the range 3 D, astigmatism less than 1 D, corrected visual acuity of 20/18 or better, and normal findings in an ophthalmic examination were enrolled. Subjects were divided into four groups, with age ranges of 19 to 29, 30 to 39, 40 to 49, and 50 to 60 years. Monochromatic optical aberrations and pupil size were measured with a Hartmann-Shack wavefront sensor under monocular viewing conditions, without pharmacological dilation or cycloplegia. Stimulus vergences were in the range of 0 to 5 D, with a…

Changes in the objective amplitude of accommodation with pupil size.

2014

PURPOSE We evaluate the effect of pupil size on objectively measured amplitude of accommodation (AA). METHODS Pupil diameter and wavefront aberrometry were obtained in 15 eyes when stimulus swept across the range of clear vision in steps of 0.5 diopters. Wavefront refraction techniques were used to compute objective AA as the maximum refractive change. Measurements were obtained monocularly under low and high ambient room lighting conditions with a fixed luminance of the fixation target. Amplitude of accommodation computations were performed taking into account just paraxial rays (paraxial AA) or including the effects of the change of spherical aberration during accommodation (minRMS AA). R…

Possible involvement of nitric oxide in morphine-induced miosis and reduction of intraocular pressure in rabbits.

2006

The role of μ3 opioid receptors in morphine-induced intraocular pressure (IOP) lowering effect and miosis was evaluated in conscious, dark-adapted New Zealand white (NZW) rabbits using a masked-design study. IOP and pupil diameter (PD) measurements were taken at just before and 0.5, 1, 2, 4, 6 h after monolateral instillation of morphine (10, 50 and 100 μg/30 μl) as compared to vehicle administered in the contralateral eye. Morphine-induced ocular effects were challenged by a pre-treatment with the non-selective opioid receptor antagonist, naloxone (100 μg/30 μl), the nitric oxide synthase inhibitor, Nω-nitro-l-arginine methyl ester (l-NAME, 1%, 30 μl), or the non-selective μ3 opioid recept…

Retinal straylight in patients with monofocal and multifocal intraocular lenses

2007

Purpose To determine the differences in retinal straylight perceived by patients with monofocal intraocular lenses (IOLs) and patients with multifocal IOLs. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Methods In this prospective study, contrast sensitivity and retinal straylight were measured prospectively 6 months postoperatively in 67 eyes of 40 patients with a monofocal or multifocal IOL. In the monofocal group, a ThinOptX IOL (ThinOptX, Inc.) was implanted in 12 eyes and an Acri.Smart 48 S IOL (Acri.Tec) in 20 eyes. In the multifocal IOL group, a ReZoom IOL (Advanced Medical Optics) was implanted in 13 eyes and a ReSTOR IOL (Alcon Laboratories) in 22 eyes. Re…

Occult non-metallic intraocular foreign body causing recurrent anterior uveitis

2015

Purpose To describe the case of textile worker with recurrent anterior uveitis following the traumatic penetration of nylon thread into the anterior segment of the eye. Methods Examination by slit-lamp of the affected eye B-scan ultrasonography during the inflammatory episode and after the resolution of the uveitis. Visual Acuity Measurement during the inflammatory episode and after the resolution of the uveitis. Results The use of topical therapy together with antibiotic systemic therapy led to the regression of the inflammatory symptoms (intense epibulbar and tarsal hyperemia with perikeratic reaction, corneal sub-oedema with some folds in the Descemet's membrane, Tyndall 2+ and a layer o…

Alcune riflessioni storico-critiche sul cosiddetto “paradosso di Duval”

2013

In 1993 a famous article by Raymond Duval highlighted a simple fact: students confuse the mathematical object O, that they are trying to build cognitively, with one of its semiotic representations R(O); he explained that this confusion was due to a sort of inevitable paradox: only someone who has already built O, can recognize R(O) as a representation of O and not as an object in itself. This idea has been extremely influential for researchers in the following years. However, many scholars of semiotics have emphasized the same phenomenon, even if in not quite the same words; in this paper we are going to mention some of them.