Studenti Ottica e Optometria

Pre-adesione evento Monza 2010

Tue, 2 Mar 2010 22:40:00 +0100

[da: News] Pre-adesione evento SOLCIOE Monza 2010

Le abilià visive nella lettura e nella dislessia

Tue, 22 Dec 2009 10:20:00 +0100

[da: News] 'Dislessia', numero 3-09

Comunicato stampa: terza conferenza di RETINITIS - la lotta alla cecità evitabile

Sat, 12 Dec 2009 17:07:56 +0100

[da: News] PRESSO L'ISTITUTO DEI CIECHI DI MILANO CON IL PATROCINIO DI REGIONE LOMBARDIA, PROVINCIA DI MILANO, COMUNE DI MILANO - È STATA ORGANIZZATA LA TERZA EDIZIONE DELLA CONFERENZA CHE RETINITIS ASSOCIAZIONE ONLUS DEDICA AL PROBLEMA DELLA CECITÀ EVITABILE.

Ricordiamo un amico scomparso: Francesco Veronesi

Sat, 26 Sep 2009 15:58:18 +0200

[da: News] co-fondatore e amico

Napoli: prende il via il nuovo Corso di laurea in Ottica e Optometria

Wed, 12 Aug 2009 16:20:16 +0200

[da: News] Anno accademico 2009-2010

Riunito a Milano il Consiglio Direttivo Nazionale dell'Ipovisione

Wed, 1 Jul 2009 16:10:00 +0200

[da: News] Comunicato stampa 30.06.2009

Studenti al 35° Congresso AdO

Thu, 21 May 2009 09:51:52 +0200

[da: News]

Riunione, autogestione e materiale da scaricare

Argo Vision al fianco degli ottici colpiti dal sisma: attivate donazioni ed iniziative di solidarietà.

Wed, 6 May 2009 16:47:56 +0200

[da: News] 4 maggio 2009

Incentivi anti crisi : non solo auto, finalmente arrivano gli sconti per l'acquisto delle biciclette

Wed, 29 Apr 2009 15:51:46 +0200

[da: News] dal 22 aprile

Ricerca volontari Ottici Optometristi

Sat, 11 Apr 2009 10:10:17 +0200

[da: News] Terremoto: colpiti anche i centri ottici all'Aquila

The reference frame of the motion aftereffect is retinotopic

Fri, 22 Jan 2010 17:56:29 +0100

[da: Scarica Appunti e Tesine] Although eye-, head- and body-movements can produce large-scale translations of the visual input on the retina, perception is notable for its spatiotemporal continuity. The visual system might achieve this by the creation of a detailed map in world coordinatesa spatiotopic representation. We tested the coordinate system of the motion aftereffect by adapting observers to translational motion and then tested (1) at the same retinal and spatial location (full aftereffect condition), (2) at the same retinal location, but at a different spatial location (retinotopic condition), (3) at the same spatial, but at a different retinal location (spatiotopic condition), or (4) at a different spatial and retinal location (general transfer condition). We used large stimuli moving at high speed to maximize the likelihood of motion integration across space. In a second experiment, we added a contrast-decrement detection task to the motion stimulus to ensure attention was directed at the adapting location. Strong motion aftereffects were found when observers were tested in the full and retinotopic aftereffect conditions. We also found a smaller aftereffect at the spatiotopic location but it did not differ from that at the location that was neither spatiotopic nor retinotopic. This pattern of results did not change when attention was explicitly directed at the adapting stimulus. We conclude that motion adaptation took place at retinotopic levels of visual cortex and that no spatiotopic interaction of motion adaptation and test occurred across saccades.

Optimal feature integration in visual search

Fri, 22 Jan 2010 17:55:25 +0100

[da: Scarica Appunti e Tesine] Despite embodying fundamentally different assumptions about attentional allocation, a wide range of popular models of attention include a max-of-outputs mechanism for selection. Within these models, attention is directed to the items with the most extreme-value along a perceptual dimension via, for example, a winner-take-all mechanism. From the detection theoretic approach, this MAX-observer can be optimal under specific situations, however in distracter heterogeneity manipulations or in natural visual scenes this is not always the case. We derive a Bayesian maximum a posteriori (MAP)-observer, which is optimal in both these situations. While it retains a form of the max-of-outputs mechanism, it is based on the maximum a posterior probability dimension, instead of a perceptual dimension. To test this model we investigated human visual search performance using a yes/no procedure while adding external orientation uncertainty to distracter elements. The results are much better fitted by the predictions of a MAP observer than a MAX observer. We conclude a max-like mechanism may well underlie the allocation of visual attention, but this is based upon a probability dimension, not a perceptual dimension.

Color and shape interactions in the recognition of natural scenes by human and monkey observers

Fri, 22 Jan 2010 17:54:27 +0100

[da: Scarica Appunti e Tesine] Trichromatic color vision is a fundamental aspect of the visual system shared by humans and non-human primates. In human observers, color has been shown to facilitate object identification. However, little is known about the role that color plays in higher level vision of non-human primates. Here, we addressed this question and studied the interaction between luminance- and color-based structural information for the recognition of natural scenes. We present psychophysical data showing that both monkey and human observers equally profited from color when recognizing natural scenes, and they were equally impaired when scenes were manipulated using colored noise. This effect was most prominent for degraded image conditions. By using a specific procedure for stimulus degradation, we found that the improvement as well as the impairment in visual memory performance is due to contribution of image color independent of luminance-based object information. Our results demonstrate that humans as well as non-human primates exploit their sensory ability of color vision to achieve higher performance in visual recognition tasks especially when shape features are degraded.

Asymmetric interference between the perception of shape and the perception of surface properties

Fri, 22 Jan 2010 17:53:38 +0100

[da: Scarica Appunti e Tesine] We previously showed that the processing of shape and the processing of surface properties linked to material properties engage different regions of the ventral stream (J. S. Cant & M. A. Goodale, 2007). Moreover, we recently used Garner's speeded-classification task to show that varying the surface (material) properties of objects does not interfere with shape judgments and vice versa (J. S. Cant, M. E. Large, L. McCall, & M. A. Goodale, 2008). In the present study, we looked at Garner interference when surface cues contributed to the perception of object shape and hypothesized that this would interfere with judgments about the width and the length of the objects. In contrast, we predicted that varying the width and the length of the objects would not interfere with surface-property judgments. This is precisely what we found. These results suggest that the shape and the surface properties of an object cannot be processed independently when both these sets of cues are linked to the perception of the object's overall shape. These observations, together with our previous findings, suggest that the surface cues that contribute to object shape are processed quite separately from the surface cues that are linked to an object's material properties.

Is the early modulation of brain activity by fearful facial expressions primarily mediated by coarse

Fri, 22 Jan 2010 17:52:35 +0100

[da: Scarica Appunti e Tesine] Rapidly decoding the emotional content of a face is an important skill for successful social behavior. Several Event Related brain Potential (ERP) have indicated that emotional expressions already influence brain activity as early as 100 ms. Some studies hypothesized that this early brain response to fear depends on coarse-magnocellular inputs, which are primarily driven by Low Spatial Frequency (LSF) cues. Until now however, evidence is inconclusive probably due to the divergent methods used to match luminance and contrast across spatial frequencies and emotional stimuli. In the present study, we measured ERPs to LSF and HSF faces with fearful or neutral expressions when contrast and luminance was matched across SF or not. Our findings clearly show that fearful facial expressions increases the amplitude of P1 (only for contrastluminance equated images) and N170 in comparison to neutral faces but only in LSF faces, irrespective of contrast or luminance equalization, further suggesting that LSF information plays a crucial role in the early brain responses to fear. Furthermore, we found that, irrespective of luminance or contrast equalization, N170 occurred faster when perceiving LSF faces than HSF faces, again emphasizing the primacy of LSF processing in early face perception.

Aging alters surround modulation of perceived contrast

Fri, 22 Jan 2010 17:51:38 +0100

[da: Scarica Appunti e Tesine] It is well established that many visual functions deteriorate with age. Perhaps counter-intuitively, a recent study revealed that older people actually require less time to discriminate the direction of motion of large, high contrast moving stimuli than young adults (L. R. Betts, C. P. Taylor, A. B. Sekuler, & P. J. Bennett, 2005). L. R. Betts et al. (2005) proposed their finding as evidence for a reduction of cortical inhibitory function within the aging visual system. There is some neurophysiological support for this suggestion, as broadening of visual cortical neural tuning consistent with reduced inhibitory function has been observed in older animals. Here we explore the perceptual consequences of center-surround suppression within the healthy aging human visual system and report data from a center-surround contrast discrimination task (the Chubb contrast illusion). We predicted that older observers would demonstrate less center-surround suppression than younger subjects (consistent with reduced inhibition). Our data does not support this prediction as perceived contrast was altered more by surround modulation in the older than younger group (t(33) = 2.53, p = 0.02). A possible explanation for our findings is a decrease in perceptual brightness induction in the elderly group. Brightness induction relies on neural synchronization which might be disrupted by aging.

Motion streaks in fast motion rivalry cause orientation-selective suppression

Fri, 22 Jan 2010 17:50:25 +0100

[da: Scarica Appunti e Tesine] We studied binocular rivalry between orthogonally translating arrays of random Gaussian blobs and measured the strength of rivalry suppression for static oriented probes. Suppression depth was quantified by expressing monocular probe thresholds during dominance relative to thresholds during suppression. Rivalry between two fast motions or two slow motions was compared in order to test the suggestion that fast-moving objects leave oriented motion streaks due to temporal integration (W. S. Geisler, 1999). If fast motions do produce motion streaks, then fast motion rivalry might also entail rivalry between the orthogonal streak orientations. We tested this using a static oriented probe that was aligned either parallel to the motion trajectory (hence collinear with the streaks) or was orthogonal to the trajectory, predicting that rivalry suppression would be greater for parallel probes, and only for rivalry between fast motions. Results confirmed that suppression depth did depend on probe orientation for fast motion but not for slow motion. Further experiments showed that threshold elevations for the oriented probe during suppression exhibited clear orientation tuning. However, orientation-tuned elevations were also present during dominance, suggesting within-channel masking as the basis of the extra-deep suppression. In sum, the presence of orientation-dependent suppression in fast motion rivalry is consistent with the motion streaks hypothesis.

Low-level mechanisms may contribute to paradoxical motion percepts

Fri, 22 Jan 2010 17:49:26 +0100

[da: Scarica Appunti e Tesine] A recent series of experiments demonstrated a surprising deterioration of visual motion discrimination with increasing stimulus size for stimuli of high contrast. This counterintuitive finding was explained as a result of surround suppression in visual area V5. Equally paradoxical was the finding that older observers showed better performance than younger observers. This second result was explained as an age-related reduction in surround suppression due to changes in GABA-mediated inhibition. Using an opponent motion stimulus, we find an analogous effect and also find that this effect is much reduced in older observers, to the point where they perform better than younger observers. Our long duration stimulus should be beyond the range at which surround-suppressed neurons in V5 are preferentially activated. Having normalized our stimuli relative to contrast threshold, we show that our results can be entirely explained by the relative contrast of the stimulus and speculate that contrast sensitivity may play a role in previously reported results. Our older observers' data similarly can be explained by the relative contrast of the stimulus. The difference between older and younger observers appears to be a result of a weakening of spatial summation at high contrast in younger observers, perhaps caused by earlier saturation of motion mechanisms.

Characterizing global and local mechanisms in biological motion perception

Fri, 22 Jan 2010 17:48:22 +0100

[da: Scarica Appunti e Tesine] The perception of biological motion is subserved by both a global process that retrieves structural information and a local process that is sensitive to individual limb motions. Here, we present an experiment aimed to characterize these two mechanisms psychophysically. Naive observers were tested on one of two tasks. In a walker detection task designed to address global processing, observers were asked to discriminate coherent from scrambled walkers presented in separate intervals. In an alternate direction discrimination task designed to address primarily local processing, observers were asked to discriminate walking direction from both coherent and spatially scrambled displays. In both tasks, we investigated performance-specificity to human (versus non-human) motion and the effects of mask density and learning on task performance. Performance in the walker detection task was best for the human walker, was susceptible to learning, and was heavily hindered by increasing mask densities. In contrast, performance on the direction discrimination task, in particular for the scrambled walkers, was unaffected by walker type, did not show a learning trend, and was relatively robust to masking noise. These findings suggest that the visual system processes global and local information contained in biological motion via distinct neural mechanisms that have very different properties.

Center-surround patterns emerge as optimal predictors for human saccade targets

Fri, 22 Jan 2010 17:47:00 +0100

[da: Scarica Appunti e Tesine] The human visual system is foveated, that is, outside the central visual field resolution and acuity drop rapidly. Nonetheless much of a visual scene is perceived after only a few saccadic eye movements, suggesting an effective strategy for selecting saccade targets. It has been known for some time that local image structure at saccade targets influences the selection process. However, the question of what the most relevant visual features are is still under debate. Here we show that center-surround patterns emerge as the optimal solution for predicting saccade targets from their local image structure. The resulting model, a one-layer feed-forward network, is surprisingly simple compared to previously suggested models which assume much more complex computations such as multi-scale processing and multiple feature channels. Nevertheless, our model is equally predictive. Furthermore, our findings are consistent with neurophysiological hardware in the superior colliculus. Bottom-up visual saliency may thus not be computed cortically as has been thought previously.

36° CONGRESSO NAZIONALE ALBO DEGLI OTTICI OPTOMETRISTI

Sat, 27 Feb 2010 16:50:00 +0100

[da: Lavoro] 24-25-26 aprile

36° albo deli ottici optometristi: RICERCA E SVILUPPO - Corso N. 8

Sat, 27 Feb 2010 16:40:00 +0100

[da: Lavoro] 24-25-26 aprile

Cerco lavoro

Wed, 17 Feb 2010 14:10:00 +0100

[da: Lavoro] cerco lavoro presso aziende o negozi di ottica, a Milano o zone limitrofe.

STAGE a Cavallino (Lecce)

Sat, 30 Jan 2010 13:10:00 +0100

[da: Lavoro] Si cerca stagista (preferibilmente con competenza in materia di ottica, o anche come addetto alle vendite) per il negozio di Salmoiraghi e Vigano'

cercasi ottico per pv pescara

Tue, 26 Jan 2010 13:30:00 +0100

[da: Lavoro] Azienda leader settore ottico cerca Ottici per PV PESCARA.

OTTICO / OPTOMETRISTA

Tue, 26 Jan 2010 11:50:00 +0100

[da: Lavoro] La società nostra cliente è un azienda del settore accessori paramedicali caratterizzata da un marcato orientamento alla crescita e al rispetto delle proprie risorse umane.
Per questa struttura abbiamo il piacere di ricercare un:
OTTICO / OPTOMETRISTA

Diplomata in Ottica

Sun, 24 Jan 2010 21:30:00 +0100

[da: Lavoro] Venticinquenne diplomata,cerco lavoro nel ramo dell'ottica.

XVI congresso annuale multidisciplinare: "Le nuove frontiere per i professionisti della visione?"

Fri, 22 Jan 2010 15:50:00 +0100

[da: Lavoro] 6-7-8 febbraio '10

Ottico Contattologo Studente di Optometria

Wed, 13 Jan 2010 11:50:00 +0100

[da: Lavoro] valuta proposte di lavoro nelle province di Milano, Novara e Varese

Ricerca ottici

Mon, 4 Jan 2010 18:30:00 +0100

[da: Lavoro] Azienda operante in Piemonte con alcuni negozi, ricerca ottici per punto vendita di Alba

Seduta di Laurea UNILE

Tue, 15 Dec 2009 15:30:00 +0100

[da: UNILE] Seduta di laurea del 17 dicembre 2009

Sessione di Laurea UNILE

Thu, 22 Oct 2009 16:00:00 +0200

[da: UNILE] SEDUTA DI LAUREA DEL 22 ottobre 2009

Sessione di Laurea Unile

Wed, 25 Feb 2009 23:30:00 +0100

[da: UNILE] Il giorno 27 Febbraio, alle ore 16,00, nell'aula " R. ANNI", si terrà una Seduta di Laurea.

Premio Italiano al Simposio di Contattologia di Las Vegas

Tue, 3 Feb 2009 14:20:00 +0100

[da: UNILE] Global Specialty Lens Symposium Las Vegas 15-18 gennaio 2009

Sessione di laurea

Fri, 16 Jan 2009 16:20:00 +0100

[da: UNILE] Il giorno 16 Dicembre 2008, alle ore 17,00 nellAula R. ANNI, si è tenuta una seduta di Laurea.

Sessione di Laurea - Università del Salento

Sat, 26 Jul 2008 13:20:00 +0200

[da: UNILE] Mercoledì 30 luglio 2008 alle ore 9.15 un'altra nostra collega raggiungerà il felice traguardo della laurea!!!

Concordato un percorso comune di tirocinio e/o tesi relativamente ai problemi visivi funzionali

Thu, 24 Jul 2008 17:10:00 +0200

[da: UNILE] In collaborazione con un IRCCS

Sessione di Laurea - Università del Salento

Sun, 27 Apr 2008 01:10:00 +0200

[da: UNILE] 30 Aprile 2008 ore 16.00

Istituzioni di matematica I

Sun, 24 Feb 2008 14:50:00 +0100

[da: UNILE]

Chimica

Sun, 24 Feb 2008 14:30:00 +0100

[da: UNILE]

Ottica Visuale risultati

Sun, 28 Feb 2010 10:50:00 +0100

[da: UNIMIB] del 24/02/2010

Risultati Tecniche Fisiche per l'Optometria 3 con laboratorio

Sun, 14 Feb 2010 21:50:00 +0100

[da: UNIMIB] del 10/02/2010

Ottica Visuale risultati

Tue, 22 Dec 2009 11:50:00 +0100

[da: UNIMIB] del 18/12/2009

Sessione di laurea - Università di Milano - Bicocca

Sat, 12 Dec 2009 18:00:00 +0100

[da: UNIMIB] 16.10.2009 e 11.12.2009

Risultati Ottica della Contattologia I

Tue, 1 Dec 2009 11:40:00 +0100

[da: UNIMIB] 25 novembre 2009

Master of science in Science and Business

Sat, 26 Sep 2009 17:30:00 +0200

[da: UNIMIB] Aalen University

Risultati dellesame di Ottica della Contattologia I con laboratorio

Tue, 15 Sep 2009 23:20:00 +0200

[da: UNIMIB] Risultati dellesame scritto effettuato venerdì 4 settembre 2009

Risultati dellesame di Ottica della Contattologia I

Wed, 1 Jul 2009 15:40:00 +0200

[da: UNIMIB] data orale da definire

Proposta di tesi

Wed, 1 Jul 2009 15:30:00 +0200

[da: UNIMIB] Deprivazione periferica e progressione miopica

Possibilità di visite optometriche nell'ambito dell'attività di ricerca del Corso di Laurea in Ottica e Optometria

Wed, 10 Jun 2009 15:20:00 +0200

[da: UNIMIB] dal 24 giugno al 30 settembre

Lezione del 24 Marzo

Thu, 19 Mar 2009 11:30:42 +0100

[da: UNIMOL]

La lezione di Tecniche Fisiche per L'optometria II del prof. Gentile del giorno in oggetto non verrà effettuata.

Esame Tecniche Fisiche per l'Optometria II

Wed, 6 Aug 2008 19:00:00 +0200

[da: UNIMOL] Variazione data appello di settembre

UNIPD - Attivazione master in "Scienze e Tecnologie della Visione"

Mon, 17 Aug 2009 10:40:00 +0200

[da: UNIPD] E' finalmente ufficiale l'attivazione del Master di 1°livello in "Scienze e Tecnologie della Visione" presso l'Università degli Studi di Padova

Spritz optometrico Patavino

Wed, 27 May 2009 16:20:00 +0200

[da: UNIPD] ogni martedì

Sessione di Laurea - Università di Padova

Tue, 15 Jul 2008 00:30:00 +0200

[da: UNIPD] Martedì 15 luglio, Ottica e Optometria

Seminario "Occhi, Visione e Lettura" - Prof. Silvio Maffioletti

Wed, 7 May 2008 23:40:00 +0200

[da: UNIPD] Lunedi 19 Maggio 2008

Tecniche fisiche per l'optometria III con laboratorio

Sat, 22 Mar 2008 17:50:00 +0100

[da: UNIPD]

Ottica oftalmica

Sat, 22 Mar 2008 17:10:00 +0100

[da: UNIPD]

Farmacologia e tossicologia oculare

Fri, 7 Mar 2008 18:10:00 +0100

[da: UNIPD]

Seminario "Ambliopia, Anomalie Sensoriali ed Adattamenti Binoculari" Università degli Studi di Padova

Fri, 29 Feb 2008 20:10:00 +0100

[da: UNIPD] Martedì 11 marzo

Biologia

Fri, 29 Feb 2008 17:30:00 +0100

[da: UNIPD]

Chimica

Thu, 28 Feb 2008 17:40:00 +0100

[da: UNIPD]

REPORT sessione Posters al Congresso BCLA 2009

Thu, 11 Jun 2009 21:50:00 +0200

[da: UNITO] Il lavoro di Frisani e Calossi è stato premiato

Studenti Ottica e Optometria

Pre-adesione evento Monza 2010

Le abilià visive nella lettura e nella dislessia

Comunicato stampa: terza conferenza di RETINITIS - la lotta alla cecità evitabile

Ricordiamo un amico scomparso: Francesco Veronesi

Napoli: prende il via il nuovo Corso di laurea in Ottica e Optometria

Riunito a Milano il Consiglio Direttivo Nazionale dell'Ipovisione

Studenti al 35° Congresso AdO

Argo Vision al fianco degli ottici colpiti dal sisma: attivate donazioni ed iniziative di solidarietà.

Incentivi anti crisi : non solo auto, finalmente arrivano gli sconti per l'acquisto delle biciclette

Ricerca volontari Ottici Optometristi

The reference frame of the motion aftereffect is retinotopic

Optimal feature integration in visual search

Color and shape interactions in the recognition of natural scenes by human and monkey observers

Asymmetric interference between the perception of shape and the perception of surface properties

Is the early modulation of brain activity by fearful facial expressions primarily mediated by coarse

Aging alters surround modulation of perceived contrast

Motion streaks in fast motion rivalry cause orientation-selective suppression

Low-level mechanisms may contribute to paradoxical motion percepts

Characterizing global and local mechanisms in biological motion perception

Center-surround patterns emerge as optimal predictors for human saccade targets

36° CONGRESSO NAZIONALE ALBO DEGLI OTTICI OPTOMETRISTI

36° albo deli ottici optometristi: RICERCA E SVILUPPO - Corso N. 8

Cerco lavoro

STAGE a Cavallino (Lecce)

cercasi ottico per pv pescara

OTTICO / OPTOMETRISTA

Diplomata in Ottica

XVI congresso annuale multidisciplinare: "Le nuove frontiere per i professionisti della visione?"

Ottico Contattologo Studente di Optometria

Ricerca ottici

Seduta di Laurea UNILE

Sessione di Laurea UNILE

Sessione di Laurea Unile

Premio Italiano al Simposio di Contattologia di Las Vegas

Sessione di laurea

Sessione di Laurea - Università del Salento

Concordato un percorso comune di tirocinio e/o tesi relativamente ai problemi visivi funzionali

Sessione di Laurea - Università del Salento

Istituzioni di matematica I

Chimica

Ottica Visuale risultati

Risultati Tecniche Fisiche per l'Optometria 3 con laboratorio

Ottica Visuale risultati

Sessione di laurea - Università di Milano - Bicocca

Risultati Ottica della Contattologia I

Master of science in Science and Business

Risultati dellesame di Ottica della Contattologia I con laboratorio

Risultati dellesame di Ottica della Contattologia I

Proposta di tesi

Possibilità di visite optometriche nell'ambito dell'attività di ricerca del Corso di Laurea in Ottica e Optometria

Lezione del 24 Marzo

Esame Tecniche Fisiche per l'Optometria II

UNIPD - Attivazione master in "Scienze e Tecnologie della Visione"

Spritz optometrico Patavino

Sessione di Laurea - Università di Padova

Seminario "Occhi, Visione e Lettura" - Prof. Silvio Maffioletti

Tecniche fisiche per l'optometria III con laboratorio

Ottica oftalmica

Farmacologia e tossicologia oculare

Seminario "Ambliopia, Anomalie Sensoriali ed Adattamenti Binoculari" Università degli Studi di Padova

Biologia

Chimica

REPORT sessione Posters al Congresso BCLA 2009

Risultati dellesame di Ottica della Contattologia I con laboratorio

Risultati dellesame di Ottica della Contattologia I