Os "daltônicos" e suas dificuldades: condição negligenciada no Brasil? / Colorblind individuals and their difficulties: a neglected condition in Brazil?

O termo "discromatopsia congênita" ("daltonismo") designa os defeitos de visão cromática, cuja taxa de prevalência entre homens é de 6% a 10%. Este estudo investigou as percepções de discromatópsicos quanto ao diagnóstico, suas dificuldades e mecanismos de enfrentamento do problema. Foi realizada pesquisa com metodologia clínica-qualitativa, na qual participaram 13 homens universitários, compondo uma amostra intencional, fechada por saturação teórica. Os dados foram coletados por meio de entrevistas individuais semiestruturadas. Os relatos foram gravados, transcritos e compuseram um corpus investigado pela técnica de análise de conteúdo categorial temática. Os participantes relataram dificuldades objetivas e subjetivas com materiais didáticos, práticas de ensino, interações com colegas e professores, já a partir do início da socialização secundária. Posteriormente, foram referidas, sobretudo, dificuldades relacionadas à decodificação de sinais de trânsito. Os participantes desenvolveram algumas habilidades de enfrentamento dessas dificuldades, mas aguardam ações a serem desencadeadas pelos poderes públicos, dirigidas ao atendimento das suas necessidades sociais, educacionais e trabalhistas...

The term congenital dyschromatopsia (colorblindness) refers to color vision genetic deficiency, whose prevalence rate is 6 to 10% among men. This study investigated the perceptions of subjects with congenital dyschromatopsia regarding diagnosis, their difficulties and coping mechanisms of the condition. This research was carried out using a clinical-qualitative methodology, in which 13 male university students took part, consisting of a purposeful sample concluded by theoretical saturation. Data were collected by conducting semi-structured individual interviews. Reports were recorded, transcribed and a corpus was made investigated by the technique of thematic categorical content. Participants reported objective and subjective difficulties with didactic material, teaching practice, interactions with colleagues and teachers, already from the beginning of their secondary socialization. Subsequently, difficulties in decoding traffic lights were mainly reported. Participants developed some coping skills to face these challenges, but await actions to be initiated by the Brazilian government to meet their social, education and labor needs...

Electroretinographic assessment and diagnostic reappraisal of children with visual dysfunction: a prospective study.

PURPOSE: To assess the presence or absence of a retinal cause of visual impairment using electroretinography (ERG) in children with no obvious discernable cause on ocular examination. DESIGN: Prospective observational case series. MATERIALS AND METHODS: A prospective study was carried out involving 120 children with the mean age 4.4+/-3.2 years with visual dysfunction. All children underwent ERG under general anesthesia using a special handheld mini-Ganzfeld (Kurbisfeld) dome. RESULTS: Fifty-two (43.3%) children were male and 68 (56.7%) were female. The clinical diagnosis was as follows: Leber's congenital amaurosis (LCA) (n=47), achromatopsia (n=25), congenital stationary night blindness (CSNB) (n=9) and others (unclassifiable, n=39). The visual acuity ranged from perception of light (PL) to PL with projection in children with LCA. In the rest (n=73), some sort of visually guided behavior was discernable. Following ERG, a diagnostic reappraisal resulted as follows: LCA (n=49), achromatopsia (n=28), CSNB (n=4), cone-rod dystrophy (n=22), rod-cone degeneration (n=7), normal (n=8) and others (unclassifiable, n=2). Except for the two unclassifiable cases, ERG was successful in the diagnosis or exclusion of retinal dysfunction in the rest. By Pearson Chi-square test, there was a statistically significant association between the clinical and ERG diagnosis (P < 0.001). CONCLUSION: LCA was the commonest cause of visual dysfunction in our series. A statistically significant correlation between clinical and electrophysiological diagnosis was seen. ERG helped in firmly establishing the presence or absence of global retinal dysfunction in the majority (118/120) of pediatric patients with visual dysfunction.

Color blindness: forensic perspective.

Color vision deficiency is a condition in which certain colors can not be distinguished, and is most commonly due to an inherited condition. Being color blind does keep one from performing certain jobs and makes other difficult. Compared to persons with normal color vision, they have some trouble differentiating between certain colors, but the severity of the color deficiency is variable. Color blindness is normally diagnosed through clinical testing- Ishihara color test is one of the most common tests used. It is mainly useful for quick screening. From a practical stand point though, many protanomalous and deteranomalous people breeze through life with very little difficulty doing tasks that require normal color vision but in some professions a normal color vision is a necessary requisite. This article focuses on the forensic perspective of abnormal color vision and future research and guidelines for assessing an individual for colour vision.

Alien hand syndrome: contradictive movement and disorder of color discrimination.

A senile Chinese female patient with alien hand syndrome of vascular etiology is reported. This case exhibited contradictive movement, left-lateral paresis and disorder of color discrimination, which might be a new subtype of the alien limb syndrome.

Prevalence of colour blindness among patients with leprosy.

Using Ishihara test plates the prevalence of colour blindness was studied on six hundred and ninety-seven leprosy patients and two hundred and ninety-two normal healthy controls. 7.88% of male patients with tuberculoid leprosy, 12.18% of male patients with lepromatous leprosy, and 0.67% of male controls were detected to be colour blind (red-green deficiency or total colour weakness). The differences between the different groups are significant. Among female patients and controls, only one lepromatous leprosy patient was detected to have red-green deficiency. This suggests the possibility of a genetic predisposition to Mycobacterium leprae infection in patients with leprosy.

Acromatopsia com ambliopia: a propósito de 3 casos / Achromatopsia with amblyopia: apropos of 3 cases

Apresenta-se, para registro, dois casos comprovados de acromatopsia com ambliopia e reporta-se a um terceiro, de diagnóstico presuntivo e retrospectivo. Esses casos pertencem ao acervo do Instituto Penido Burnier. Trata-se de condiçäo rara, cuja ocorrência é estimada, na populaçäo geral, da ordem de 1 para 300.000. Ao ensejo, caracteriza-se a afecçäo que se define particularmente por: acromatopsia, ambliopia, fotofobia e nistagmo. As coordenadas para o diagnóstico diferencial säo analisadas. Considera-se também a patogenia, os achados histológicos, bem como os procedimentos terapêuticos plausíveis para diminuir o desconforto dos pacientes e permitir-lhes o aprendizado