Search results for "Ulls Acomodació i refracció"
showing 5 items of 5 documents
Symptomatic accommodative and binocular dysfunctions from the use of flat-panel displays
2018
AIM: To determine the presence of symptomatic accommodative and non-strabismic binocular dysfunctions (ANSBD) in a non-presbyopic population of video display unit (VDU) users with flat-panel displays. METHODS: One hundred and one VDU users, aged between 20 to 34y, initially participated in the study. This study excluded contact-lens wearers and subjects who had undergone refractive surgery or had any systemic or ocular disease. First, subjects were asked about the type and nature of eye symptoms they experienced during VDU use. Then, a thorough eye examination excluded those subjects with a significant uncorrected refractive error or other problem, such as ocular motility disorders, vertica…
Response of the aging eye to first day of modern material contact lens wear
2018
Objectives: To investigate the ocular surface of an aged population wearing a daily disposable contact lens over their first day of wear. Methods: Forty eyes from forty presbyopic subjects were fitted a daily CL (Delefilcon A). Tear osmolarity, tear meniscus area (TMA) and ocular surface aberrations (total higher order root means square (RMS)) were assessed at baseline (t0), at 20 minutes (t1) and after 8 hours (t2) of wear. Fluorescein corneal and conjunctival staining and tear break up time (TBUT) were performed at t0 and t2. Results: No statistically significant changes were found between t0, t1 and t2 for TMA, and between t0 and t2 for fluorescein corneal and conjunctival staining. TBUT…
Compensación de la vista en España hasta la mitad del siglo XVIII
2016
Tal como indica Mary Beard, premio Princesa de Asturias 2016, "entender la antigüedad ayuda a entendernos hoy". La óptica y la optometría en España, no es una excepción, se pueden considerar tres etapas temporales importantes para su desarrollo, desde el origen hasta la mitad del siglo XVIII, (correspondiendo al inicio y establecimiento de la actividad artesanal), desde la segunda mitad del siglo XVIII hasta la primera mitad del siglo XX, (que es la consolidación de la actividad profesional), y desde la segunda mitad del siglo XX hasta la actualidad, (siendo la evolución de la profesión reglada académicamente, y con sus funciones dentro de la rama sanitaria).
Analysis and applicability of protocols to diagnosis of refractive errors in children
2018
Actualmente, una gran parte de la poblacion, especialmente de los paises en desarrollo, no tiene acceso a servicios de salud visual de calidad. La poblacion infantil es la mas afectada, dado que la maduracion del sistema visual ocurre en los primeros anos de vida, por lo cual es necesario realizar tamizaje o examen visual completo en esta poblacion para identificar anomalias ocu-lares como errores de refraccion y ambliopia. Los protocolos para el tamizaje visual o examen completo varian ampliamente en el tipo de pruebas y procedimientos, aunque la mayoria utiliza la agudeza visual (AV) y la refraccion como principales criterios diagnosticos. Estas pruebas clinicas deben tener buena calidad …
Presbyopia and the aging eye: Existing refractive approaches and their potential impact on dry eye signs and symptoms.
2020
Every part of the human body is subject to aging, including the eye. Increased prevalence of dry eye disease with age is widely acknowledged: aging threatens ocular surface homeostasis, altering the normal functioning of the lacrimal functional unit and potentially leading to signs and symptoms of dry eye. Parallelly, two additional degenerative processes take place within the crystalline lens, leading to presbyopia and cataractogenesis. With continuously increasing life expectancies both conditions are expected to impact society further. Correction strategies for presbyopia and cataracts either directly or indirectly challenge ocular surface additionally. On one hand, contact lens presbyop…