Abstract：
PURPOSE:To analyze cone and rod phototransduction parameters from ERG a-waves in patients with RP and to determine the relationships among these parameters, age, and mode of inheritance. METHODS:Sets of four white flashes (3.2-4.4 log scotopic troland [scot td-s]) were presented in the dark. The same stimuli were later presented against a rod-saturating background and the generated cone a-waves were subtracted from the dark-adapted responses to produce rod-only a-waves. The rod-only and cone a-waves were fit with computational models. RESULTS:Of 418 consecutive patients with retinitis pigmentosa (RP), cone a-waves were quantifiable in 136 (33%), whereas rod a-waves were quantifiable in 125 (30%). Cone R(max) (maximum response) and cone S (sensitivity) parameters were significantly below normal in all RP subgroups. Cone R(max) was lower in XlRP than in other forms of inheritance (P < 0.05). Cone S was abnormal in 77.9% of all patients with RP and in 96.8% of those with XlRP. More than 95% of the rod R(max) values were abnormal, whereas rod S was abnormal in 61.6% of these patients. CONCLUSIONS:The efficiency of cone phototransduction appears to be affected in all forms of RP, even in some patients in whom the sensitivity of rod phototransduction is normal. In this cross-sectional sample, there was no evidence that transduction efficiency decreased with increasing age of the patient. The X-linked mode of inheritance is associated with greater abnormalities in cone and rod photoreceptor function at a younger age compared with the other modes of inheritance.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Tzekov RT,Locke KG,Hood DC,Birch DGdoi
10.1167/iovs.02-1104keywords:
subject
Has Abstractpub_date
2003-09-01 00:00:00pages
3993-4000issue
9eissn
0146-0404issn
1552-5783journal_volume
44pub_type
杂志文章abstract：PURPOSE:Connexin50 (Cx50) is absolutely essential for normal postnatal lens growth. Deletion of Cx50 or replacement with Cx46 by knockin resulted in smaller lenses containing fewer cells. To determine why Cx50-deficient lenses fail to grow normally, cell proliferation was assayed during the period of growth failure. M...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.04-0194
更新日期：2004-09-01 00:00:00
abstract：PURPOSE:Bicarbonate transport plays a role in aqueous humor (AH) secretion. The authors examined bicarbonate transport mechanisms and carbonic anhydrase (CA) in porcine nonpigmented ciliary epithelium (NPE). METHODS:Cytoplasmic pH (pH(i)) was measured in cultured porcine NPE loaded with BCECF. Anion exchanger (AE), so...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.08-2487
更新日期：2009-04-01 00:00:00
abstract：:Although intravitreal injection of antibiotics is being used more widely in treatment of bacterial endophthalmitis, the pharmacokinetic principles that underlie such therapy have been derived exclusively from experiments in the rabbit. Therefore, we studied several representative antibiotics in normal eyes of rhesus m...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1983-12-01 00:00:00
abstract：Purpose:To investigate the effect of reducing high glucose (HG)-induced lysyl oxidase (LOX) overexpression and increased activity on retinal endothelial cell apoptosis. Methods:Rat retinal endothelial cells (RRECs) were grown in normal (N) or HG (30 mM glucose) medium for 7 days. In parallel, RRECs were grown in HG me...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.16-21340
更新日期：2017-05-01 00:00:00
abstract：Purpose:To compare blood pressure and urine albumin-creatinine ratio over time for participants receiving aflibercept, bevacizumab, or ranibizumab. Methods:Preplanned secondary analyses from a randomized trial comparing aflibercept, bevacizumab, and ranibizumab for diabetic macular edema (DME). The Diabetic Retinopath...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章,随机对照试验
doi：10.1167/iovs.17-22853
更新日期：2018-03-01 00:00:00
abstract：PURPOSE:We measured the aqueous humor levels of matrix metalloproteinases (MMP) MMP-1, MMP-2, MMP-3, and tissue inhibitors of matrix metalloproteinases (TIMP) TIMP-1, TIMP-2, and TIMP-3 in patients with myopia or cataract, and investigated the relationship between their levels and axial length (AL). METHODS:We measure...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.14-13983
更新日期：2014-05-29 00:00:00
abstract：PURPOSE:The authors' previous study showed that the expression of a Rho-associated serine/threonine kinase (ROCK) is regulated during cell cycle progression in corneal epithelial cells. The present study was conducted to determine whether and how Rho/ROCK signaling regulates cell cycle progression. METHODS:Rabbit corn...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.07-0488
更新日期：2008-01-01 00:00:00
abstract：PURPOSE:The degeneration of retinal pigment epithelial (RPE) cells is considered to be a crucial event in the pathophysiology of age-related macular degeneration (AMD). Cumulative oxidative damage has been implicated in the development of the changes seen in AMD. The present study was undertaken to evaluate the express...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：2002-11-01 00:00:00
abstract：PURPOSE:Many types of chronic blepharitis have been believed to be primarily microbial in origin; however, it was proposed that differences and changes in lipid composition of meibomian secretion may be the initiating factor in some of these. It was recently reported that there are two subgroups of normals, those whose...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1993-06-01 00:00:00
abstract：PURPOSE:Vitamin D3 is a secosteroid mainly synthesized from the conversion of the skin precursor 7-dehydrocholesterol (7DHC) to vitamin D3 by ultraviolet (UV) B sunlight. Extrarenal synthesis of vitamin D3 has been reported in many tissues and cells, including barrier sites. This study characterizes the expression of c...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.13-13019
更新日期：2014-04-07 00:00:00
abstract：PURPOSE:To evaluate a porcine anterior chamber perfusion model and to test the transferability of data obtained with this model to the human system. METHODS:Porcine eyes were obtained from a local abattoir and processed within 2 hours after death. Anterior chambers of 42 pairs of eyes were dissected with removal of le...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.05-1393
更新日期：2006-05-01 00:00:00
abstract：PURPOSE:Methylprednisolone (MP) is commonly used to treat traumatic optic neuropathy and optic neuritis, but its benefit in terms of neuronal survival remains controversial. The aim of this study was to investigate the effects of MP on retinal ganglion cell (RGC) survival and visual function after ischemia in rats. ME...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.08-1869
更新日期：2008-11-01 00:00:00
abstract：:The earlier reports from this laboratory that the renewal of rat photoreceptor membranes was dependent on essential fatty acids have not been confirmed in more recent studies. ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1978-11-01 00:00:00
abstract：PURPOSE:We studied the correlation between outer nuclear layer (ONL) thickness and cone density in normal eyes and eyes with retinitis pigmentosa (RP). METHODS:Spectral-domain optical coherence tomography (SD-OCT) scans were acquired using a displaced pupil entry position of the scanning beam to distinguish Henle's fi...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章,随机对照试验
doi：10.1167/iovs.14-15521
更新日期：2014-12-16 00:00:00
abstract：PURPOSE:We compared the ability of circumpapillary retinal nerve fiber layer (cpRNFL) thickness and macular parameters obtained by three spectral-domain optical coherence tomography (SD-OCT) instruments to detect glaucoma. METHODS:We enrolled 87 normal eyes and 145 glaucomatous eyes (75 early glaucomatous eyes (EGs), ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.12-11268
更新日期：2013-07-10 00:00:00
abstract：PURPOSE:We report on instantaneous volumetric flow rate of vitreous cutters measured by means of particle image velocimetry (PIV). METHODS:In an in vitro experimental study, vitreous cutters mounting a regular blade (RB) or modified Twedge blade (TB) engineered for higher flow were connected to a console machine equip...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.14-15467
更新日期：2014-11-20 00:00:00
abstract：:Heightened interest in meibomian glands dysfunction prompted the authors to examine the ultrastructure of the glandular epithelium in specimens of surgical origin, by thin section and freeze-fracture electron microscopies. In meibomian glands, the morphology and ultrastructure of acinar cells varies considerably accor...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1992-06-01 00:00:00
abstract：:Experiments were performed with a model of focal, thermal-induced ulceration to test the clinical impression that vascularization prevents ulceration of the corneal stroma. Slow-release polymers containing a vasoproliferase agent (tumor angiogenesis factor) were placed in corneal pockets 2 mm central to the limbus of ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1980-04-01 00:00:00
abstract：:The lacrimal gland is a functional part of the mucosal immune system and is populated by lymphoid cells that begin to appear early in neonatal development. To define the events controlling the accumulation of these cells, an in vitro adherence assay was used to investigate the interactions of lymphocyte populations wi...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1990-08-01 00:00:00
abstract：PURPOSE:To investigate the effect of high glucose on the proliferation of human retinal endothelial cells (HRECs) and to elucidate the possible mechanisms of antiangiogenic activity of curcumin, a diferuloylmethane. METHODS:Human retinal endothelial cells were isolated from the retinal tissue obtained from human donor...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.05-0580
更新日期：2006-05-01 00:00:00
abstract：:The impact of aging on cell loss in the human retina was examined in foveal and temporal equatorial regions in eyes from 35 donors with ages spanning a 78-yr period from the second to the ninth decade of life. Equatorial cones and retinal pigment epithelial cells (RPE) decreased at uniform rates from the second to the...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1992-01-01 00:00:00
abstract：PURPOSE:Previous studies have demonstrated a role for the retinal pigment epithelium (RPE) in the development and maintenance of the choroidal vasculature, suggesting that RPE serves a trophic role for the choroidal vessels. The goal of this study was to determine the expression pattern of vascular endothelial growth f...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.05-1229
更新日期：2006-07-01 00:00:00
abstract：PURPOSE:Human adenovirus species D type 19 (HAdV-D19) has been associated with epidemic keratoconjunctivitis (EKC), a highly inflammatory infection of the ocular surface. Confusion exists regarding the origins of HAdV-D19. The prototype virus (HAdV-D19p) does not cause EKC, while a virus identified later with the ident...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.12-9656
更新日期：2012-05-14 00:00:00
abstract：PURPOSE:To determine whether the lipid peroxidation inhibitor tirilazad mesylate can block the death of retinal ganglion cells induced by the inhibition of oxidative phosphorylation and glycolysis. METHODS:Rat retinal ganglion cells were labeled retrogradely with the fluorescent tracer DiI, and mixed cultures were pre...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1996-12-01 00:00:00
abstract：PURPOSE:Severe ocular allergic diseases are characterized by pronounced conjunctival inflammation triggered by T helper 2 (Th2) cells and corneal epithelial damage induced by eosinophils. To examine the role of alarmins released by damaged corneal epithelial cells in tissue eosinophilia, we investigated the effects of ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.13-11969
更新日期：2013-08-27 00:00:00
abstract：PURPOSE:Leber hereditary optic neuropathy (LHON) is an inherited mitochondrial optic neuropathy characterized by bilateral, severe loss of central vision. In this study, the first formal assessment was conducted of visual disability in affected and unaffected individuals from molecularly confirmed LHON pedigrees. METH...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.08-3166
更新日期：2009-07-01 00:00:00
abstract：PURPOSE:We examined the treatment period necessary to restore retinal and visual stability following trauma to the optic nerve. METHODS:Cats received unilateral optic nerve crush and no treatment (NT), treatment of the injured eye with brain-derived neurotrophic factor (BDNF), or treatment of the injured eye combined ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.13-12683
更新日期：2013-10-09 00:00:00
abstract：Purpose:To evaluate the nature and extent of functional abnormality in X-linked retinoschisis (XLRS) by comparing three dark-adapted, full-field measures: the electroretinogram (ERG), pupillary light reflex (PLR), and luminance threshold. Methods:ERGs, PLRs (pupil constriction due to light stimulation), and luminance ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.61.6.53
更新日期：2020-06-03 00:00:00
abstract：PURPOSE:We evaluated whether UVA-riboflavin collagen cross-linking (CXL) increases transverse stromal shear moduli ex vivo, whether the shear moduli are greater in the anterior compared to the posterior stroma, and whether the shear moduli are affected by CXL. METHODS:The resistance to unidirectional transverse shear ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.12-10710
更新日期：2013-07-26 00:00:00
abstract：PURPOSE:To examine the accommodative accuracy and amplitude in children with Down syndrome. Accommodation is usually assumed to be good in children and is rarely measured. METHODS:A dynamic retinoscopy technique was developed that allows rapid and reliable measures of accuracy and amplitude of accommodation in infants...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1993-06-01 00:00:00
