Optics and Refraction

Rubin, Melvin L.; Hope, G. M.

doi:10.1016/s0161-6420(96)30768-9

Cited by 5 publications

(3 citation statements)

References 50 publications

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“…A utilização de cães machos e fêmeas teve como objetivo a verificação de possível influência deste parâmetro sobre as mensurações, como realizado por GAIDDON et al (1991 HOPE (1996).…”

Section: Resultsunclassified

“…A primeira citação de aplicação de LIO foi feita em humanos, por Ridley, apud RUBIN & HOPE (1996), e data de 1949. Essa descoberta tornou rotineiro o uso de LIOs em humanos, mas, nos animais, a forma do cristalino, por variar nas diversas espécies, torna a oftalmologia veterinária carente de informações mais precisas sobre esse assunto.…”

Section: Introductionunclassified

“…Consideraram que a melhor escolha seria fazer os cães emétropes individualmente ou implantar uma LIO de 41D, próxima à média de emetropia. RUBIN & HOPE (1996) fizeram uma revisão na oftalmologia humana sobre refração e correção. A disponibilidade do ultra-som modo-A tornou esse exame auxiliar rotineiro para determinar o poder adequado de LIOs e tem contribuído para resultados visuais excelentes após a cirurgia.…”

Section: Introductionunclassified

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Sexo, Peso E Conformação Anatômica Do Olho Sobre Cálculode Poder Dióptrico De Lentes Intra-Oculares No Cão

2002

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RESUMO A catarata, especialmente na espécie canina, é uma doença oftálmica importante. Seu tratamento é eminentemente cirúrgico, mas a perda do cristalino resulta em alta hipermetropia, e a visão fica comprometida. A correção pode ser feita com a utilização de lente intra-ocular (LIO SUMMARY Cataract is an important ophthalmic disease in dogs. Treatment is often surgical, but the removal of the lens produces hypermetropy and vision is impaired. Correction is usually performed with an intraocular lens (IOL). This study had the purpose of obtaining data for intraocular lens production in order to use in aphakic dogs, because cataracts is a very common ocular disease in this species INTRODUÇÃODas doenças oculares dos cães, a catarata ocupa lugar de destaque. Catarata é o nome que se dá à opacidade do cristalino, resultando em baixa visão, chegando a impossibilitar o contato visual com o meio ambiente. Seu único tratamento é cirúrgico, mas a remoção desta lente torna o olho alto hipermétrope. Relatos sobre facectomia em cães iniciaram nos anos 50 e 60, ficando os cirurgiões satisfeitos com a visão afácica hiperópica dos pacientes, a qual possibilita evitar colisões e reconhecer pessoas e objetos. A correção desta alta

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Section: Resultsunclassified

Section: Introductionunclassified

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Sexo, Peso E Conformação Anatômica Do Olho Sobre Cálculode Poder Dióptrico De Lentes Intra-Oculares No Cão

2002

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Accommodation, the Pupil, and Presbyopia

Ciuffreda¹

2006

Borish's Clinical Refraction

125

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Visual acuity losses in pigeons with lesions of the nucleus of Edinger-Westphal that disrupt the adaptive regulation of choroidal blood flow

et al. 1998

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Choroidal blood flow (ChBF) in birds is regulated by a neural circuit whose components are the retina, the suprachiasmatic nucleus, the medial division of the Edinger-Westphal nucleus (EWM), the ciliary ganglion, and the choriod. We have previously shown that lesions of EWM appear to result in pathological alterations in the retina. To determine whether EWM lesions also lead to altered visual functions, we have examined the effects of EWM lesions on visual acuity in pigeons. Bilateral lesions of EWM were made electrolytically, and visual acuity for high-contrast, square-wave gratings was determined behaviorally about 1 year later and compared to that of a group of pigeons that had received sham lesions of EW about 1 year prior to acuity testing. Because lesions targeting EWM invariably resulted in damage to the adjoining lateral part of the Edinger-Westphal nucleus (EWL), which controls pupillary constriction and accommodation, two additional control groups were studied. In one such control group, bilateral lesions in the area pretectalis (AP), which innervates the pupillary control part of EWL and thereby controls pupillary constriction, were made and the effects on visual acuity determined about 1 year later. In the second such control group, the effects of acute accommodative and pupillary dysfunction on acuity were studied in pigeons made cycloplegic. The accuracy of all lesions was later confirmed histologically. The mean acuities of birds with AP lesions (9.1+/-1.4 cycles/deg) and sham lesions (7.1+/-1.5 cycles/deg) were not significantly different from normal, based on published normative data on pigeons. In contrast, pigeons with lesions that completely destroyed EW bilaterally showed visual acuity (2.7+/-0.1 cycles/deg) that was well below the acuity of the sham and AP-lesion control groups. The acuity of the cycloplegic pigeons (4.8+/-0.3 cycles/deg) and one pigeon with a nearly complete bilateral EWL but a unilateral EWM lesion (6.4 cycles/deg) indicated that only about half of the loss with a bilateral EW lesion could be attributed to accommodative dysfunction. Thus, bilateral destruction of EWM appears to have led to a loss in visual acuity. This conclusion suggests that disruption of adaptive neural regulation of ChBF may impair visual function. Destruction of EWM was, however, associated with damage to the somatic components of the oculomotor and trochlear nuclei. The possibility cannot be excluded that such damage also contributed to the acuity loss.

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Optics and Refraction

Cited by 5 publications

References 50 publications

Sexo, Peso E Conformação Anatômica Do Olho Sobre Cálculode Poder Dióptrico De Lentes Intra-Oculares No Cão

Sexo, Peso E Conformação Anatômica Do Olho Sobre Cálculode Poder Dióptrico De Lentes Intra-Oculares No Cão

Accommodation, the Pupil, and Presbyopia

Visual acuity losses in pigeons with lesions of the nucleus of Edinger-Westphal that disrupt the adaptive regulation of choroidal blood flow

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