Contrast sensitivity mediated by ON-and OFF-subsystems of the magno-and parvocellular pathways in mercury vapor intoxication (2011)
- Authors:
- USP affiliated authors: VENTURA, DORA SELMA FIX - IP ; GUALTIERI, MIRELLA - IP
- Unidade: IP
- Subjects: MERCÚRIO (ELEMENTO QUÍMICO); INTOXICAÇÃO
- Language: Inglês
- Abstract: Purpose. To evaluate achromatic contrast sensitivity (CS) with magnocellular- (M) and parvocellular- (P) probing stimuli in type 2 diabetics, with (DR) or without (NDR) nonproliferative retinopathy. Methods. Inferred M- and P-dominated responses were assessed with a modified version of the steady-/pulsed-pedestal paradigm (SP/PP) applied in 26 NDR (11 male; mean age, 55 ± 9 years; disease duration, 5 ± 4 years); 19 DR (6 male; mean age, 58 ± 7 years; disease duration = 9 ± 6 years); and 18 controls (CTRL; 12 male; mean age, 55 ± 10 years). Thresholds were measured with pedestals at 7, 12, and 19 cd/m2, and increment durations of 17 and 133 ms. The thresholds from the two stimulus durations were used to estimate critical durations (Tc) for each data set. Results. Both DR and NDR patients had significant reduction in CS in both SP and PP paradigms in relation to CTRL (Kruskal-Wallis, P < 0.01). Patients' critical duration estimates for either paradigm were not significantly different from CTRL. Conclusions. The significant reduction of CS in both paradigms is consistent with losses of CS in both M and P pathways. The CS losses were not accompanied by losses in temporal processing speed in either diabetic group. Significant CS loss in the group without retinopathy reinforces the notion that neural changes associated with the cellular and functional visual loss may play an important role in the etiology of diabetic visual impairment. In addition, the results show that the SP/PP paradigm provides an additional tool for detection and characterization of the early functional damage due to diabetes.
- Imprenta:
- Publisher place: Philadelphia
- Date published: 2011
- Source:
- Título do periódico: Investigate Ophthalmology & Visual Neuroscience
- Volume/Número/Paginação/Ano: v. 52, n. 2, p. 1151-1155, 2011
-
ABNT
GUALTIERI, Mirella et al. Contrast sensitivity mediated by ON-and OFF-subsystems of the magno-and parvocellular pathways in mercury vapor intoxication. Investigate Ophthalmology & Visual Neuroscience, v. 52, n. 2, p. 1151-1155, 2011Tradução . . Disponível em: http://www.iovs.org/content/52/2/1151.abstract?sid=214ed17f-b8c6-4e1f-9c07-e1e7f9787cfd. Acesso em: 24 abr. 2024. -
APA
Gualtieri, M., Bandeira, M., Hamer, R. D., Damico, F. M., Moura, A. L. A., & Ventura, D. S. F. (2011). Contrast sensitivity mediated by ON-and OFF-subsystems of the magno-and parvocellular pathways in mercury vapor intoxication. Investigate Ophthalmology & Visual Neuroscience, 52( 2), 1151-1155. Recuperado de http://www.iovs.org/content/52/2/1151.abstract?sid=214ed17f-b8c6-4e1f-9c07-e1e7f9787cfd -
NLM
Gualtieri M, Bandeira M, Hamer RD, Damico FM, Moura ALA, Ventura DSF. Contrast sensitivity mediated by ON-and OFF-subsystems of the magno-and parvocellular pathways in mercury vapor intoxication [Internet]. Investigate Ophthalmology & Visual Neuroscience. 2011 ; 52( 2): 1151-1155.[citado 2024 abr. 24 ] Available from: http://www.iovs.org/content/52/2/1151.abstract?sid=214ed17f-b8c6-4e1f-9c07-e1e7f9787cfd -
Vancouver
Gualtieri M, Bandeira M, Hamer RD, Damico FM, Moura ALA, Ventura DSF. Contrast sensitivity mediated by ON-and OFF-subsystems of the magno-and parvocellular pathways in mercury vapor intoxication [Internet]. Investigate Ophthalmology & Visual Neuroscience. 2011 ; 52( 2): 1151-1155.[citado 2024 abr. 24 ] Available from: http://www.iovs.org/content/52/2/1151.abstract?sid=214ed17f-b8c6-4e1f-9c07-e1e7f9787cfd - Early visual changes in diabetic patients with no retinopathy measured by color discrimination and electroretinography
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