Abstract:
PURPOSE:To describe the electroretinogram of the South-American opossum (Didelphis aurita) obtained by chromatic stimulus of specific wavelengths. The electroretinogram records voltage variations of retinal cells triggered by light stimulation. The electroretinogram represents the combination of electric activity of many different cells and varies according to retinal physiology and examination methods. METHODS:We recorded the electroretinogram of six animals in dark adaptation using chromatic Kodak Wratten filters, and recorded the spectral sensitivity to specific wavelengths in the spectrum of blue, green, yellow, orange and red light bands. RESULTS:The most consistent electrorretinographic results were obtained when the animals were stimulated by selective spectral bands instead of white light. These results are consistent with the absorbance curve of the opsins described in marsupial photoreceptors. Previous studies using microspectrophotometry of opsins and retinal immunohistochemistry suggested marsupial trichromacy. This morphologic knowledge has not before been physiologically demonstrated by electroretinographic methods. CONCLUSION:The South-American opossum has proven to be an interesting experimental animal for comparative visual physiology studies among other mammals, especially studies on phylogenetic of chromatic vision. The opossum represents a retinal model that superimposes both the photopic and scotopic systems; and the Didelphis genus shows few changes when compared to the fossils of the Pleocene period. Therefore the marsupial's visual system retrieves characteristics from ancient mammal evolution to the retinal patterns found in modern mammals.
journal_name
Arq Bras Oftalmoljournal_title
Arquivos brasileiros de oftalmologiaauthors
Cunha DC,Hokoç JN,Dantas AM,Moraes Junior HV,Moraes AMdoi
10.1590/s0004-27492006000600014subject
Has Abstractpub_date
2006-11-01 00:00:00pages
857-63issue
6eissn
0004-2749issn
1678-2925pii
S0004-27492006000600014journal_volume
69pub_type
杂志文章abstract:PURPOSE:To identify the frequency of ocular changes in patients with Hansen's disease, living in a colony hospital; to confirm the predilection for the anterior segment of the eye instead of the posterior segment. METHODS:Transversal study of 115 eyes of 58 in-patients at João Paulo II colony, Marituba-Pará, from Augu...
journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492005000300017
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章,随机对照试验
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abstract:PURPOSE:To describe an outbreak of Pseudomonas aeruginosa endophthalmitis post cataract surgery. Clinical findings, treatment and outcome are discussed. METHODS:Clinical charts review of forty-five patients treated for endophthalmitis in a two-day period. The patients underwent primary vitrectomy, anterior chamber irr...
journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492012000500010
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abstract:Purpose::To investigate the short-term (1 week) and long-term (8 weeks) protective effects of zinc administration on radioiodine (RAI)-induced lacrimal gland damage of rats. Methods::A total of 40 rats were divided into two groups: an RAI group (n=20), which was administrated a single dose of 3 mCi of 131I and 1 mL ph...
journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
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journal_title:Arquivos brasileiros de oftalmologia
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doi:10.1590/s0004-27492008000100013
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abstract::The optical coherence tomography (OCT) and indocyanine green angiography (ICGA) findings of a 58-year-old male with acute syphilitic posterior placoid chorioretinitis are reported herein. Best-corrected visual acuity was 20/150 in the right eye (OD) and 20/30 in the left eye (OS) at presentation. On funduscopy, there ...
journal_title:Arquivos brasileiros de oftalmologia
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492006000100016
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
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journal_title:Arquivos brasileiros de oftalmologia
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492006000200022
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abstract:PURPOSE:Compare the retinal structure of the macula and fovea among premature infants with retinopathy of prematurity (ROP) stages II and III post treatment, premature infants with ROP stages II and III with spontaneous regression and premature infants without ROP, through optical coherence tomography (OCT) and binocul...
journal_title:Arquivos brasileiros de oftalmologia
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更新日期:2013-03-01 00:00:00
abstract:PURPOSE:To investigate whether the time interval between type 2 diabetes mellitus (DM) diagnosis and the first fundoscopic examination is related with the presence and the severity of diabetic retinopathy (DR) observed. METHODS:A survey of 105 type 2 DM patients referred to ophthalmologic evaluation in the "Hospital d...
journal_title:Arquivos brasileiros de oftalmologia
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doi:10.1590/s0004-27492010000300006
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journal_title:Arquivos brasileiros de oftalmologia
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journal_title:Arquivos brasileiros de oftalmologia
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章,随机对照试验
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更新日期:2007-09-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492007000100031
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492008000100023
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journal_title:Arquivos brasileiros de oftalmologia
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journal_title:Arquivos brasileiros de oftalmologia
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journal_title:Arquivos brasileiros de oftalmologia
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更新日期:2017-09-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章,随机对照试验
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更新日期:2012-03-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
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doi:10.5935/0004-2749.20160113
更新日期:2016-11-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
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更新日期:2014-10-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492013000300010
更新日期:2013-05-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492006000400018
更新日期:2006-07-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.5935/0004-2749.20140049
更新日期:2014-05-01 00:00:00
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journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.5935/0004-2749.20160052
更新日期:2016-05-01 00:00:00
abstract:PURPOSE:To evaluate the effectiveness in in-traocular pressure reduction and safety of micropulse trans-scleral diode cyclophotocoagulation in refractory glaucoma. METHODS:We prospectively evaluated a case series of 21 eyes of 21 consecutive patients with refractory glaucoma treated with micropulse transscleral diode ...
journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
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更新日期:2019-06-27 00:00:00
abstract:PURPOSE:To study the distribution of the central corneal thickness and its correlations with other biometric data in patients with congenital glaucoma. METHODS:Patients had been divided into two groups: group "A", composed of patients with congenital glaucoma, being subdivided in two sub-groups: with Haab striae (A1) ...
journal_title:Arquivos brasileiros de oftalmologia
pub_type: 杂志文章
doi:10.1590/s0004-27492011000200002
更新日期:2011-03-01 00:00:00