105 research outputs found
Miopizzazione temporanea e sintomatologia soggettiva in operatori al videoterminale
No full textThe study covered a group of female VDT operators assigned to data entry and data acquisition. Subjective VDT-related symptoms of asthenopia were assessed by means of a questionnaire. All operators were examined by an ophthalmologist. Visual acuity was measured using vision tables with optotypes. In order to achieve an objective assessment of VDT-induced visual fatigue, refractive power was measured at the beginning and at the end of the shift, using an infra-red autorefractometer. Changes in refractive power were then related to VDT work and asthenopia symptoms. Visual acuity defects were observed in 63.5% of the operators; in 36% of the cases the subjects were either unaware of the defects or the defects were not adequately corrected. 62.5% of the operators complained of subjective asthenopia symptoms. Asthenopia was not related to the number of hours at the VDT. The results suggest that ametropic subjects are likely to be more susceptible to visual fatigue than emmetropic subjects, since there was a tendency for the prevalence of asthenopia to increase in the former group. A significant decrease in refractive power (temporary myopization) was observed in 20% of the operators at the end of the shift at the VDT: all these subjects also complained of asthenopia, compared to 50% of the workers without end-of-shift myopization. The difference between the groups was highly significant (p less than 0.01); contrarywise, none of the subjects without asthenopia developed myopization. On the basis of these results, it can be concluded that end-of-shift myopization, as measured by an automatic refractometer, may be used as a reliable objective measurement of VDT-related visual fatigu
Visual fatigue in video display terminal operators: objective measure and relation to environmental conditions
No full textThe lighting conditions, luminance, contrast, and design of the workplace were studied in video display terminal (VDT) work stations operated by a group of female VDT data-acquisition clerks. VDT-induced symptoms were assessed by means of subject answers to a questionnaire. To measure VDT-induced ocular fatigue objectively, refraction power was determined before and at the end of workshift by an infrared autorefractometer. Job-induced refraction changes were then related to visual complaints and conditions in the workplace. The results confirmed that VDT data-acquisition work can lead to temporary myopia (myopization) in a remarkable percentage of operators; a significant correlation between eye discomfort, ocular asthenopia, and myopization was also found. Illumination levels, luminance, and contrast seem to be of paramount importance regarding visual symptoms: neither asthenopia nor myopization was observed when all of these conditions were adequate. If the ergonomic design of the workplace and the viewing distance are adequate, there are also usually fewer musculoskeletal symptoms. Our results suggest that changes in the ocular refraction status before and at the end of the workshift, as determined by an automatic refractometer, provide a good objective index of VDT-induced "ocular fatigue", which in our study proved to be significantly related to workplace conditions. © 1988 Springer-Verlag
Crateri a colonnette etruschi a figure rosse
No full textDue importanti documenti della più antica ceramografia etrusca a figure ross
Edilizia domestica di periodo arcaico a Caulonia e Crotone
No full textI dati relativi all’edilizia domestica di periodo arcaico a Caulonia sono molto ridotti.
A fronte di un’occupazione ampia della superficie urbana contestuale alle prime fasi di vita
della colonia, solo pochi siti restituiscono tracce di strutture murarie databili a partire dal
VII sec. a.C. Le testimonianze più consistenti provengono dal sito di S. Marco nord-est dove
sono documentate due fasi edilizie relative a edifici diversi posti ai margini di un asse stradale.
Di uno di essi nel corso della fase più tarda si propone una ricostruzione della planimetria e
della destinazione d’uso degli ambienti.
Per lo stesso periodo a Crotone, sulla base dei dati disponibili, si ipotizza che nel corso delle
prime fasi di vita dell’abitato siano in uso strutture abitative a carattere precario. A partire
dalla fine del VII sec. a.C. è attestato lo sviluppo di una rete viaria della quale si riconoscono
stenopoi e ambitus in particolare nel settore centrale della città, dove si localizzano di conseguenza
le testimonianze più antiche e cospicue relative a edifici in muratura. Uno sviluppo
più consistente interessa anche gli altri quartieri in una fase più tarda (seconda metà/fine
VI sec. a.C. - inizi V sec. a.C.). La maggior parte delle strutture analizzate si caratterizza per
omogeneità delle tecniche costruttive e di soluzioni planimetriche e continuità di vita nel
corso dei periodi successivi
The McCollough effect and visual fatigue induced by the use of green phosphorus monochromatic video terminals
No full textWe examined 101 students (40 men, 61 women) aged 16-19 years, working 1-3 hours daily with video display terminals (VDT) with luminous green characters on dark background. McCollough visual aftereffect (ME) was reported, almost occasionally, in 80.2% of the examined group. 68% of the students referred daily ME appearance. Usually the effect appeared after 1 hour or less of VDT work and might persist for 1 hour or more. ME prevalence and persistence were significantly greater in women than in men. Apparently no relations were observed between ME prevalence and VDT work hours of visual defects. ME prevalence and persistence were significantly related to VDT induced visual asthenopia symptoms, but not with ocular asthenopia. According to our results, ME appearance may represent an early index of individual susceptibility to visual asthenopia induced by green characters VDT and/or be itself a precocious visual asthenopia sympto
Serum type III procollagen peptide in asbestos workers: an early indicator of pulmonary fibrosis
No full texterum type III procollagen peptide (PIIIP) concentrations were determined in 36 male workers exposed to asbestos fibres in the production of asbestos cement items and in 13 healthy male controls. Mean (SD) PIIIP serum concentrations were 9.3 (1.5) ng/ml (range 7-12) in the controls and 13.7 (3.5)ng/ml (range 7.5-20) in the asbestos workers; the difference was statistically significant (p less than 0.01). The exposed workers were subdivided according to presence or absence of radiological signs of asbestosis and intensity and duration of exposure. PIIIP serum values of workers with asbestos related interstitial fibrosis were the highest of the groups at 14.6 (2.3) ng/ml. In workers with heavy exposure the PIIIP values were significantly related to duration of exposure (r = 0.95; p less than 0.01). PIIIP serum values may be a useful index for the early diagnosis of asbestos induced pulmonary fibrosis and its use should be considered as part of the biological monitoring of exposed worker
Offerte d'armi nei santuari della Calabria ionica settentrionale
No full textSi propone una sintesi dei dati archeologici editi relativi alla deposizioni di armi nei luoghi di culto della Sibaritide fino al confine con la Crotoniatide settentrionale. Il contributo si articola in una breve presentazione dei singoli contesti seguita dall’analisi della consistenza e qualità dei rinvenimenti e si chiude con alcune riflessioni comparative sulle similitudini e difformità che caratterizzano nel complesso i siti considerati
Un'anfora arcaica: da Atene all'Etruria
No full textUn'anfora arcaica del Ceramico ateniese e il suo viaggio verso una tomba etrusca di Caere, rinvenuta nella necropoli di Monte Abaton
Occupational exposure to noise and hearing injury: estimation of the frequency of hearing loss among workers in Emilia-Romagna
No full text- …
