Attention deficit and hyperactivity disorder (ADHD) is a neurodevelopmental condition commonly seen in children adolescents, characterised by an increase distractibility or inattention. Several studies have noted higher rate of visual problems this group, especially convergence insufficiency (CI), but when using different diagnostic criteria. The aim study was to evaluate function ADHD non-ADHD controls compare the signs for diagnosis CI.

When observers focus their stereoscopic visual system for a long time (e.g., watching 3D movie) they may experience discomfort or asthenopia. We tested two types of models predicting fatigue in task which subjects were instructed to discriminate between characters. One model was based on viewing distance (focal distance, vergence distance) and another direction (oculomotor imbalance).A test designed assess binocular while looking at stimuli located different directions viewed from distances...

This study aims to detect alterations in the spatio-chromatic pseudophakic vision produced by multifocal diffractive intraocular lenses (IOLs) and provides a physical interpretation.In vitro characterization of imaging performance two IOLs: AT LISA Tri (Zeiss) FineVision (PhysIOL) on-bench model eye illuminated with red (R, 625 nm), green (G, 530 nm) blue (B, 455 lights. We used metrics: energy efficiency (EE), area under modulation transfer function, longitudinal chromatic aberration (LCA),...

The defocus curve (DC) has become the gold standard method for assessing visual performance at different distances, and hence, to evaluate depth of focus that is provided by modern presbyopia-compensating intraocular lenses are used in cataract surgery. A former study, carried out other authors, reported DC method, based on placing chart far distance using trial negative lenses, underestimated acuity was measured varying test (VD) pseudophakic patients. We have revisited issue with subjects...

Background A thorough analysis of continuous adventitious sounds (CAS) can provide distinct and complementary information about bronchodilator response (BDR), beyond that provided by spirometry. Nevertheless, previous approaches to CAS were limited certain methodology issues. The aim this study is propose a new integrated approach contributes improving the assessment BDR in clinical practice for asthma patients. Methods Respiratory flow recorded 25 subjects, including 7 patients with...

Single image random dot stereograms (SIRDS) have been used to study diverse visual parameters and skills. The aim of the present was identify main optometric factors involved in perception SIRDS obtain a discriminant model categorise our participants terms their skill perceiving SIRDS.Response time determined assess ability 69 perceive hidden three-dimensional shape an auto-stereogram presented under controlled conditions, whereupon three level groups were defined. same administered battery...

The double-pass method is applied to determine the optical image quality in monofocal contact lens (CL) wearers. This an objective non-invasive technique that permits vivo testing of performance CL wearers' eyes. Retinal was measured for three subjects wearing two types CLs: a rigid gas permeable (RGP) and soft (SL), pupil diameters 3 mm 5 mm. Results show importance ocular astigmatism regarding retinal quality. In eyes presenting corneal astigmatism, best results are obtained when RGP CLs,...

Presently, little is known about the effect of curved backgrounds against which target stimulus presented on precision in stereoacuity. The experiment analyzed influence orientation and 3D background configuration stereoscopic vision. Participants were instructed to perform visual alignment tasks a modified version Howard-Dolman apparatus, whereupon depth perception for different (flat, black, concave, convex) was evaluated. In addition, (0°, 45°, 90°) examined. findings revealed an...

To compare the frequency of perceived and remembered symptoms other aspects related to Contact Lens (CL) wear between a group current former wearers in order identify possible factors that may lead dropout CL wear. Dropout was defined as cessation according initial guidelines after adaptation period. Methods: A telephone survey conducted on sample 385 patients from an eye clinic who were either or within last 5 years. Demographic characteristics, patient clinical history, symptomatology,...

A great deal of studies using different visual tasks (e.g., Vernier acuity tasks, tilt illusion, crowding, etc) have revealed that our perception is strongly influenced by the orientation stimulus.Most investigated in twodimensional spaces (2D) but little known about effect line depth (3D).In one experiment, Acuity (VA) frontoparallel and medial (3D) planes was investigated.We used a virtual reality setup inducing inter-ocular disparities to simulate 3D space, common computer screen present...

Numerous research efforts have been directed toward determining the origin of anisotropies visual space, in contrast to real space.Recent neurophysiological studies placed primary cortex (V1) or beyond.The present study sought provide new psychophysical evidence these using auto-stereograms as stimuli a relative depth judgment task.The observers were presented with hidden three-dimensional shape that consisted two pairs parallel line segments located different planes and oriented at 0°...

1 Universitat Politècnica de Catalunya, Terrassa School of Optics and Optometry (SPAIN)2 University Vision Centre (SPAIN)