Abstract：
PURPOSE:We tested the hypothesis that retinal blood flow has a postocclusive reactive hyperemia response modulated by occlusion duration and metabolic activity, and that choroidal blood flow does not. METHODS:Anesthetized and paralyzed rats (n = 34) were studied. Retinal and choroidal blood flow was measured by laser speckle imaging and laser Doppler flowmetry, respectively. Blood oxygenation level-dependent functional magnetic resonance imaging (BOLD fMRI) was used to measure changes in relative blood oxygenation of the retinal and choroidal circulations. Transient carotid occlusion was elicited with a hydraulic occluder on the common carotid artery. Several occlusion durations were tested during dark, constant light, and flicker light conditions to modulate metabolic demand. The hyperemia response magnitude was quantified by integrating the area above the blood flow baseline for the 3 minutes after release of the occlusion. RESULTS:Systemic arterial pressure (108.2 ± 1.4 mm Hg) was unaffected by the carotid occlusions, and was similar among animals and conditions. Retinal blood flow had a reactive hyperemia, but choroidal blood flow did not (e.g., 14 ± 2%.sec versus 0.5 ± 4%. sec after 60-second occlusion). The hyperemia magnitude increased as a nonlinear function of occlusion duration and reached a plateau at occlusion durations < 60 second. The hyperemia magnitude was not altered by different lighting conditions at occlusion durations of 15 and 60 seconds. BOLD fMRI results were similar to the laser-based blood flow measurements. CONCLUSIONS:The results indicate that metabolic local control has a negligible role in choroidal blood flow regulation and only partially accounts for the blood flow behavior in the retinal circulation.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Li G,Kiel JW,Cardenas DP,De La Garza BH,Duong TQdoi
10.1167/iovs.13-12404subject
Has Abstractpub_date
2013-07-30 00:00:00pages
5123-31issue
7eissn
0146-0404issn
1552-5783pii
iovs.13-12404journal_volume
54pub_type
杂志文章abstract：PURPOSE:To develop a sensitive and reproducible technique for measuring the adherence of blood lymphocytes to vessel walls exposed in sections of human retina and for examining the role of lymphocyte and vascular adhesion molecules in these events. METHODS:Cryostat sections of human retina were overlaid with blood lym...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1997-11-01 00:00:00
abstract：PURPOSE:To develop a new test of activities of daily living (ADLs) appropriate for the low-vision population: the Melbourne Low-Vision ADL Index (MLVAI). METHODS:The MLVAI was designed as a desk-based clinical assessment, comprising 18 observed items on complex ADLs in part (a) and 9 questions on broad self-care ADLs ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：2001-05-01 00:00:00
abstract：:The retinal blood vessels serve for nutrition of the retinal ganglion cells and their axons. This study was undertaken to evaluate the vessel diameter in normal and glaucoma eyes. The calibers of the superior temporal and inferior temporal retinal artery and vein were measured at the optic disc border and at a distanc...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1989-07-01 00:00:00
abstract：PURPOSE:There is no consensus as how to calculate orbital soft tissue volume based on CT or MRI scans. The authors sought to validate their technique and to assess the intraobserver and interobserver variability of their calculations of bony orbital volume (OV), orbital fat volume (FV), and extraocular muscle volume (M...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.07-1030
更新日期：2008-05-01 00:00:00
abstract：Purpose:This study addresses the hypothesis that age-related stresses upregulate Thy-1 in choroidal endothelial cells (CECs) and contribute to CEC activation and migration, processes important in choroidal neovascularization (CNV). Methods:Measurements were made of Thy-1 protein (Western blot) in CECs and Thy-1 mRNA (...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.16-19691
更新日期：2016-10-01 00:00:00
abstract：PURPOSE:To describe the variation in ocular biometry in adult Chinese individuals in Singapore. METHODS:This study was a population-based, cross-sectional survey of adult Chinese persons aged 40 to 81 years residing in Tanjong Pagar district, Singapore. Axial ocular dimensions, including axial length (AL), anterior ch...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：2001-01-01 00:00:00
abstract：PURPOSE:To test the hypothesis that changes in the viscoelastic material properties of peripapillary sclera are present within monkey eyes at the onset of early experimental glaucoma detected by confocal scanning laser tomography (CSLT). METHODS:Short-term (3-9 weeks), moderate (< or =44 mm Hg) intraocular pressure (I...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.04-0114
更新日期：2005-02-01 00:00:00
abstract：:The capacities of porcine choroidal fibroblasts, retinal glial cells, and retinal pigment epithelial cells to contract collagen gels in vitro were compared. Experiments with varied cell numbers indicated that glial cells are the most effective, followed by choroidal fibroblasts and retinal pigment epithelial cells. An...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1992-07-01 00:00:00
abstract：PURPOSE:To assess the reproducibility of the ocular response analyzer (ORA) in nonoperated eyes and the impact of corneal biomechanical properties on intraocular pressure (IOP) measurements in normal and glaucomatous eyes. METHODS:In the reliability study, two independent examiners obtained repeated ORA measurements i...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.07-0280
更新日期：2008-03-01 00:00:00
abstract：PURPOSE:In addition to photoreceptor degeneration, excessive light causes degenerative alterations in the inner retina and ganglion cell death. A disturbance in osmohomeostasis may be one causative factor for the alterations in the inner retina. Because Müller cells mediate inner retinal osmohomeostasis (mainly through...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.08-1723
更新日期：2008-08-01 00:00:00
abstract：PURPOSE:To isolate tissue-specific gene products that contribute to corneal integrity. METHODS:A cDNA library was constructed and differentially hybridized. Cornea-specific clones were purified and further characterized. RESULTS:In this study cornea-specific gene products were isolated by differential cDNA hybridizat...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1998-09-01 00:00:00
abstract：PURPOSE:To compare macular pigment optical density (MPOD) in type 2 diabetic and nondiabetic patients by using dual-wavelength autofluorescence imaging and to investigate the correlation of MPOD with glycosylated hemoglobin (HbA1C) and serum lipid levels. METHODS:Forty-three patients were divided into groups 1 (contro...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.09-4695
更新日期：2010-11-01 00:00:00
abstract：PURPOSE:To examine changes in spherical equivalent over a 5-year period in persons 43 to 84 years of age. METHODS:All people 43 to 84 years of age and living in Beaver Dam, Wisconsin, in 1988 were invited for a baseline examination (1988-1990) and a 5-year follow-up examination (1993-1995). Refractions were determined...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1999-07-01 00:00:00
abstract：PURPOSE:The aim of this study was to investigate the repeatability of manual measurements of choroidal thickness in healthy subjects imaged on spectral domain optical coherence tomography (OCT) using the enhanced depth imaging (EDI) technique. METHODS:Fifty consecutive, healthy, young, adult volunteers with no known e...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.10-6024
更新日期：2011-04-08 00:00:00
abstract：PURPOSE:P1 is the major positive component of pattern-reversal visual evoked potentials (PR-VEPs). The rapid decrease of its latency correlates with the progressive myelination in the developing infant brain, which affects signal transmission in the visual system. An age-dependent phase shift, analogous to P1 peak late...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.14-13906
更新日期：2014-04-21 00:00:00
abstract：PURPOSE:We assessed the association between complement pathway genes and age-related macular degeneration (AMD) in a Chinese population. METHODS:In a case-control study, 165 AMD patients and 216 unrelated controls were recruited from two hospitals in central China. We selected and genotyped six single nucleotide poly...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.12-10453
更新日期：2013-01-07 00:00:00
abstract：PURPOSE:The exact pathophysiological processes underlying keratoconus remain an enigma. In this study, laser scanning in vivo confocal microscopy (IVCM) was used to define further the microstructural abnormalities in the keratoconic cornea and to establish the relationship with disease severity. METHODS:This was a pro...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.07-0968
更新日期：2008-07-01 00:00:00
abstract：PURPOSE:To characterize the cellular expression patterns of antiangiogenic factors differentially regulated in the fetal human macula. METHODS:RNA was extracted from macular, nasal, and surround biopsies of three human fetal retinas at midgestation. Relative levels of expression of pigment epithelium-derived factor (P...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.09-4905
更新日期：2010-08-01 00:00:00
abstract：PURPOSE:Autophagy is a lysosomal machinery-dependent process that catabolizes cellular components/organelles and proteins in an autophagic vacuole (AV)-dependent and -independent manner, respectively. Short-term exposure of the retina to bright light results in shortening of the outer segments, concomitant with AV form...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.10-6278
更新日期：2011-05-05 00:00:00
abstract：PURPOSE:To assess the impact of a novel visual field spatial filtering technique on the detection of glaucomatous progression. METHODS:One hundred ninety-eight ocular hypertensive (OHT) and 21 control subjects were examined prospectively (1994-2001) with regular full-threshold Humphrey visual field (VF) testing. VF pr...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.06-0576
更新日期：2007-01-01 00:00:00
abstract：PURPOSE:To explore the effect of dominance and laterality on refractive error and axial length. METHODS:Ocular dominance was assessed with the hole-in-the-card test in 543 children during their 2006 follow-up visits for the Singapore Cohort study Of the Risk factors for Myopia (SCORM). Data were compared to cycloplegi...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.06-1489
更新日期：2007-08-01 00:00:00
abstract：:Ocular ultraviolet radiation (UVR) exposure was assessed in three occupational groups: fisherman, landscape workers and construction workers. The ratio of ocular exposure to ambient exposure was determined by placing UV-sensitive film (295-320 nm) between the eyes of the subjects and in a nearby open field. The mean o...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1988-04-01 00:00:00
abstract：Purpose:Mesopic flash electroretinography (fERG) as a tool to identify N-methyl-d-aspartate receptor (NMDAR) hypofunction in subjects with schizophrenia shows great potential. We report the first fERG study in a genetic mouse model of schizophrenia characterized by NMDAR hypofunction from gene silencing of serine racem...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.61.2.16
更新日期：2020-02-07 00:00:00
abstract：:To evaluate the penetration of ciprofloxacin, a new wide-spectrum oral antibiotic, into the vitreous, ciprofloxacin was administered orally to 21 patients who were scheduled to undergo vitreal surgery. Seven patients received 750 mg ciprofloxacin 4 hr before surgery (group I), seven patients received this dose 8 hr be...
journal_title：Investigative ophthalmology & visual science
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：1991-07-01 00:00:00
abstract：PURPOSE:To investigate both the effect of diabetic macular edema (DME) on measured peripapillary retinal nerve fiber layer (RNFL) thickness and the effect of intravitreal bevacizumab injection on RNFL thickness using spectral-domain optical coherence tomography (SD-OCT) in patients with diabetic retinopathy. METHODS:W...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.13-13776
更新日期：2014-05-15 00:00:00
abstract：:To investigate the accumulation of tear proteins on disposable extended-wear contact lenses (42% Etafilcon A and 58% hydration), a technique involving sodium dodecyl sulfate-polyacrylamide minigel electrophoresis combined with a sensitive silver-staining method was used. Besides the binding of large amounts of tear ly...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1990-11-01 00:00:00
abstract：PURPOSE:To investigate whether signaling pathways that incorporate protein tyrosine kinases and phosphatases regulate PKC-sensitive, volume-sensitive Cl(-) currents (I(Cl,vol)) in cultured rabbit nonpigmented ciliary epithelial cells. METHODS:Activation of I(Cl,vol) in response to hyposmotic stimulation was recorded w...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：2002-05-01 00:00:00
abstract：PURPOSE:To develop a modified adenoassociated viral (AAV) vector capable of efficient transfection of retinal ganglion cells (RGCs) and to test the hypothesis that use of this vector to express brain-derived neurotrophic factor (BDNF) could be protective in experimental glaucoma. METHODS:Ninety-three rats received one...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.02-1332
更新日期：2003-10-01 00:00:00
abstract：PURPOSE:Glaucoma is an optic neuropathy commonly associated with elevated intraocular pressure (IOP), leading to optic nerve head (ONH) cupping, axon loss, and apoptosis of retinal ganglion cells (RGCs), which could ultimately result in blindness. Brn3b is a class-4 POU domain transcription factor that plays a key role...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.14-15008
更新日期：2015-01-13 00:00:00
abstract：Purpose:The lysozyme 2 (Lyz2 or LysM) cre mouse is extensively used to achieve genetic manipulation in myeloid cells and it has been widely employed in retinal research. However, LysM has been recently described to be expressed in brain neurons and there is a debate on whether it is also expressed by resident microglia...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.61.3.51
更新日期：2020-03-09 00:00:00
