Comment évaluer la perception visuelle ?

Des tests de vision, comme l'optométrie, évaluent la perception visuelle.

Quels examens pour troubles de la perception ?

L'IRM et l'électrorétinogramme aident à diagnostiquer les troubles de la perception.

Quels signes indiquent un problème visuel ?

Des difficultés à voir, des illusions ou des distorsions visuelles peuvent indiquer un problème.

Quand consulter un spécialiste de la vue ?

Consultez un ophtalmologiste si vous ressentez des changements soudains de vision.

Quelles sont les causes de troubles visuels ?

Les causes incluent les maladies oculaires, les traumatismes et les troubles neurologiques.

Quels symptômes de troubles de la perception ?

Les symptômes incluent la vision floue, les halos, et les difficultés de profondeur.

Comment reconnaître une illusion visuelle ?

Les illusions visuelles se manifestent par des perceptions erronées d'objets ou de couleurs.

Qu'est-ce que l'agnosie visuelle ?

L'agnosie visuelle est l'incapacité de reconnaître des objets malgré une vision intacte.

Quels signes d'une fatigue visuelle ?

Les signes incluent des maux de tête, des yeux secs et une vision floue après un usage prolongé.

Comment se manifeste la synesthésie visuelle ?

La synesthésie visuelle se manifeste par des associations involontaires entre couleurs et sons.

Comment prévenir les troubles de la perception ?

Protégez vos yeux avec des lunettes de soleil et faites des examens réguliers.

Quel rôle joue l'alimentation sur la vision ?

Une alimentation riche en vitamines A, C et E peut aider à maintenir une bonne vision.

Comment réduire la fatigue visuelle ?

Faites des pauses régulières lors de l'utilisation d'écrans pour réduire la fatigue visuelle.

Pourquoi éviter le tabac pour la vision ?

Le tabac augmente le risque de maladies oculaires comme la dégénérescence maculaire.

L'exercice physique aide-t-il la vision ?

Oui, l'exercice régulier améliore la circulation sanguine, bénéfique pour la santé oculaire.

Quels traitements pour troubles de la perception ?

Les traitements incluent la thérapie visuelle, les lunettes et parfois la chirurgie.

Comment la thérapie visuelle aide-t-elle ?

La thérapie visuelle améliore la coordination œil-main et la perception visuelle.

Les lunettes corrigent-elles la perception ?

Oui, les lunettes corrigent les erreurs de réfraction et améliorent la perception visuelle.

Quand envisager une chirurgie oculaire ?

La chirurgie est envisagée pour des problèmes structurels comme la cataracte ou le glaucome.

Quels médicaments pour troubles visuels ?

Des médicaments peuvent traiter des conditions comme le glaucome ou les infections oculaires.

Quelles complications des troubles visuels ?

Les complications incluent la perte de vision, l'isolement social et des troubles émotionnels.

Comment les troubles visuels affectent-ils la vie quotidienne ?

Ils peuvent limiter les activités quotidiennes, affecter le travail et la mobilité.

Quels risques de dépression avec troubles visuels ?

Les troubles visuels augmentent le risque de dépression en raison de l'isolement social.

Les troubles de la perception peuvent-ils s'aggraver ?

Oui, sans traitement, certains troubles de la perception peuvent s'aggraver avec le temps.

Quelles sont les conséquences d'une agnosie visuelle ?

L'agnosie visuelle peut entraîner des difficultés dans la reconnaissance d'objets et des interactions sociales.

Quels facteurs de risque pour troubles visuels ?

Les facteurs incluent l'âge, les antécédents familiaux et les maladies chroniques.

Le diabète augmente-t-il les risques visuels ?

Oui, le diabète peut causer des complications oculaires comme la rétinopathie diabétique.

Comment l'hypertension affecte-t-elle la vision ?

L'hypertension peut endommager les vaisseaux sanguins de l'œil, entraînant des troubles visuels.

Le stress influence-t-il la perception visuelle ?

Oui, le stress peut affecter la concentration et la clarté de la perception visuelle.

Les antécédents de traumatismes oculaires sont-ils un risque ?

Oui, les traumatismes oculaires augmentent le risque de troubles de la perception visuelle.

Perception visuelle - Informations médicales vérifiées

Blood Platelets in Infection: The Multiple Roles of the Platelet Signalling Machinery.

18 Apr 2023

DOI: 10.3390/ijms24087462 PMID: 37108623

Platelets are classically recognized for their important role in hemostasis and thrombosis but they are also involved in many other physiological and pathophysiological processes, including infection....

Humans Blood Platelets Immunity, Innate Inflammation Hemostasis +1 autres

Screening platelet function in blood donors.

08 2022

DOI: 10.1111/trf.16990 PMID: 35748562

Transfusion of defective platelets could contribute to the inefficiency of platelet transfusion in preventing or stopping bleeding.... This single-center prospective study aimed to determine the prevalence of functional platelet abnormalities in a population of blood donors with a clinical history of bleeding diathesis or with histor... One hundred and ninety-five donors identified based on a history of hematoma and 2434 blood donors were included in the study. Eighty-eight donors (3.6%) had a bleeding score indicating a potential bl... The bleeding questionnaire proved to be a valuable tool to screen blood donors for potential platelet defects. Platelet dysfunction was rare in the blood donor population assessed. Additional studies ...

Adult Blood Coagulation Disorders Blood Donors Blood Platelet Disorders Blood Platelets +9 autres

Margination of 2D Platelet Microparticles in Blood.

21 03 2023

DOI: 10.1021/acsmacrolett.2c00718 PMID: 36821525

Margination describes the movement of particles toward the endothelial wall within blood vessels. While there have been several studies tracking the margination of spherical particles in blood, the be...

Scattering, Small Angle X-Ray Diffraction Drug Delivery Systems Blood Platelets

Unveiling the mechanism of platelet dysfunction in Parkinson's disease: The effect of 6-hydroxydopamine on human blood platelets.

Jul 2023

DOI: 10.1016/j.parkreldis.2023.105453 PMID: 37244106

Parkinson's disease (PD) is a progressive neuronal illness often linked to increased cardiovascular complications, such as myocardial infarction, cardiomyopathy, congestive heart failure, and coronary... To gain a better understanding of platelet dysfunction in PD, we investigated the impact of 6-hydroxydopamine (6-OHDA), an analog of dopamine that simulates PD by destroying dopaminergic neurons, on h... Our findings showed that 6-OHDA treatment increased the production of ROS in human blood platelets. The increase in ROS was confirmed by the ROS scavenger, NAC, and was also reduced by inhibiting the ... Our findings suggest that the 6-OHDA-induced ROS production is regulated by the IP...

Humans Parkinson Disease Reactive Oxygen Species Oxidopamine Blood Platelets +1 autres

Two novel platelet biotinylation methods and their impact on stored platelet concentrates in a blood bank environment.

11 2022

DOI: 10.1111/trf.17129 PMID: 36190148

Storage of platelet concentrates (PCs) has an impact on platelet quality and possibly affects their functions after transfusion. The influence of processing and storage conditions of PCs on their in v... Two methods of biotinylation were compared to a control (standard PC). The "Bio-Wash" process used washing steps to label all platelets within the PC; for the other method, "Bio-Direct," one fifth of ... Both methods achieved a stable labeling through the storage, with similar platelet counts and metabolism in comparison to control PCs. Bio-Wash showed higher activation phenotype and lower aggregation... We set up two methods of biotinylation that can be easily implemented in a blood bank environment. The Bio-Direct process was preferred to the Bio-Wash because of its similarity, from a functional and...

Humans Blood Platelets Platelet Transfusion Blood Banks Biotinylation +2 autres

Tigecycline treatment causes a decrease in peripheral blood platelet.

Oct 2023

DOI: 10.1080/1120009X.2022.2153315 PMID: 36472515

Tigecycline with broad-spectrum activity against pathogens has advantages in the treatment of severe infections in clinical. Accompany with the huge increase of tigecycline usage, more side effects be...

Humans Tigecycline Anti-Bacterial Agents Minocycline Blood Platelets +2 autres

Platelet Inventory and Using Out-of-group Platelet Suspension: A Cost-Effective Strategy for a Blood Transfusion Service.

23 May 2023

DOI: 10.56875/2589-0646.1041 PMID: 37363973

Platelet (PLT) transfusions are essential for advanced hospitals, especially those with onco-hematology departments. However, platelet concentrates (PCs) have supply limitations and a shorter shelf li... This retrospective study was conducted over a 4-year period between January 2017 and January 2021 in a tertiary referral hospital. From the beginning of 2020, as a new strategy of our TS, a PLT invent... In 2017, a total of 799 PPCs were used and 70 PPCs were discarded with the expiration ratio (ER) of 8.0%. In 2018, 1124 PPCs were used and 99 PPCs were discarded with the ER of 7.4%. In 2019, 726 PPCs... The results of the current study suggested that with the determination of the platelet stock level and the use of out-of-group PCs, the rate of discarded PLT could be reduced. Nevertheless, based on c...

Humans Retrospective Studies Cost-Benefit Analysis ABO Blood-Group System Blood Platelets +1 autres

In vitro exposure of whole blood to a cannabinoid mixture impairs the quality of red blood cells and platelets.

05 2023

DOI: 10.2450/2022.0100-22 PMID: 35969136

In a recent study, 13.8% of blood donors had reported cannabis use in the 72 hours preceding their donation, and these donors are not deferred under existing criteria in Canada. This high prevalence r... To mimic pre-donation cannabis use, whole blood was collected and exposed (in vitro) to varying concentrations (range: 1-24 μg/mL) of a cannabinoid mixture (CM) overnight. Whole blood was then separat... In the RBC fraction, free hemoglobin levels were increased in a dose-dependent manner after the addition of a cannabinoid mixture to whole blood. Hemolysis and methemoglobin levels were significantly ... An in vitro exposure to a cannabinoid mixture hemolyzed RBCs, impaired oxygen transport by RBCs, reduced platelet counts, and impaired platelet function. These results suggest that pre-donation cannab...

Humans Cannabinoids Hemolysis Erythrocytes Blood Platelets +2 autres

Association of blood donor characteristics with in vitro platelet storage properties.

Oct 2023

DOI: 10.1016/j.transci.2023.103746 PMID: 37286442

The study was planned to determine the association of blood donor characteristics with in vitro quality of platelets.... In the prospective observational study, a total of 85 male whole blood donors in the age group of 18-30 and 45-65 years were enrolled using purposive sampling method. Serum total cholesterol, glycosyl... Median MPV was higher in platelets from older blood donors on day five (9.8 vs 9.4, p = 0.037). Median LDH levels were also higher in platelets on day one and five from older donors (Day one: 204.5 vs... In vitro platelet storage properties are affected by blood donor characteristics....

Humans Male Blood Donors Blood Platelets Blood Preservation +7 autres

Mitochondrial gene expression is required for platelet function and blood clotting.

28 Nov 2023

DOI: 10.1016/j.celrep.2023.113312 PMID: 37889747

Platelets are anucleate blood cells that contain mitochondria and regulate blood clotting in response to injury. Mitochondria contain their own gene expression machinery that relies on nuclear-encoded...

Humans Genes, Mitochondrial Proteomics Hemostasis Blood Coagulation +5 autres

Perception visuelle : Questions médicales fréquentes

Termes MeSH sélectionnés :

Questions fréquentes et termes MeSH associés

Diagnostic 5

Symptômes 5

Prévention 5

Traitements 5

Complications 5

Facteurs de risque 5

Contenu validé par Dr Olivier Menir

Sous-catégories

Clignement attentionnel

Perception des couleurs

Perception du mouvement

Reconnaissance visuelle des formes

Clôture perceptive

Vision binoculaire

Vision monoculaire

Reconnaissance faciale

Auteurs principaux

Sources (10000 au total)