Abstract：
Purpose:There is strong evidence that abnormalities in corneal biomechanical play a causal role in corneal ectasias, such as keratoconus. Additionally, corneal crosslinking (CXL) treatment, which halts progression of keratoconus, directly appeals to corneal biomechanics. However, existing methods of corneal biomechanical assessment have various drawbacks: dependence on IOP, long acquisition times, or limited resolution. Here, we present a method that may avoid these limitations by using optical coherence tomography (OCT) to detect the endogenous random motion within the cornea, which can be associated with stromal crosslinking. Methods:Phase-decorrelation OCT (PhD-OCT), based in the theory of dynamic light scattering, is a method to spatially resolve endogenous random motion by calculating the decorrelation rate, Γ, of the temporally evolving complex-valued OCT signal. PhD-OCT images of ex vivo porcine globes were recorded during CXL and control protocols. In addition, human patients were imaged with PhD-OCT using a clinical OCT system. Results:In both the porcine cornea and the human cornea, crosslinking results in a reduction of Γ (P < 0.0001), indicating more crosslinks. This effect was repeatable in ex vivo porcine corneas (change in average Γ = -41.55 ± 9.64%, n = 5) and not seen after sham treatments (change in average Γ = 2.83 ± 12.56%, n = 5). No dependence of PhD-OCT on IOP was found, and correctable effects were caused by variations in signal-to-noise ratio, hydration, and motion. Conclusions:PhD-OCT may be a useful and readily translatable tool for investigating biomechanical properties of the cornea and for enhancing the diagnosis and treatment of patients.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Blackburn BJ,Gu S,Ford MR,de Stefano V,Jenkins MW,Dupps WJ Jr,Rollins AMdoi
10.1167/iovs.18-25535subject
Has Abstractpub_date
2019-01-02 00:00:00pages
41-51issue
1eissn
0146-0404issn
1552-5783pii
2720153journal_volume
60pub_type
杂志文章abstract：PURPOSE:To screen polymorphisms in complement factor-H (CFH), toll-like receptor 4 (TLR4), and APOE genes as potential risk factors for age-related macular degeneration (AMD) in Indian patients. METHODS:One hundred patients with AMD and 120 normal control subjects were screened for the polymorphisms by restriction dig...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.05-1430
更新日期：2006-09-01 00:00:00
abstract：PURPOSE:To analyze the mechanism of action of adrenomedullin (AM), a peptide recently isolated from human pheochromocytoma, in isolated canine central retinal arteries and to compare the action of calcitonin gene-related peptide (CCRP). METHODS:Changes in isometric tension were recorded in helical strips of the arteri...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1997-01-01 00:00:00
abstract：PURPOSE:To determine the role of connexin43 (Cx43) and gap junctional intercellular communication (GJIC) in the response of the human retinal pigment epithelial cell line ARPE-19 to oxidative stress. METHODS:ARPE-19 cells were treated with the chemical oxidant tert-butyl hydroperoxide (t-BOOH), and cell viability was ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.07-0717
更新日期：2008-02-01 00:00:00
abstract：PURPOSE:To identify genes and molecular mechanisms associated with photoreceptor degeneration in a canine model of XLRP caused by an RPGR exon ORF15 microdeletion. Methods. Expression profiles of mutant and normal retinas were compared by using canine retinal custom cDNA microarrays. qRT-PCR, Western blot analysis, and...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.10-5443
更新日期：2010-11-01 00:00:00
abstract：PURPOSE:To evaluate the performance of an automated retinal image quality assessment system for use in automated diabetic retinopathy grading. METHODS:Algorithmic methods have been developed for assessing the quality of 45 degrees single field retinal images for use in diabetic retinopathy screening. For this purpose,...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.05-1155
更新日期：2006-03-01 00:00:00
abstract：Purpose:To investigate the roles and pathways of microRNAs 143 and 145 in transforming growth factor (TGF)-β1-induced human subconjunctival fibrosis. Methods:Human tenon's capsule fibroblasts (HTFs) were obtained from a healthy eye. After treating cultured HTFs with TGF-β1, the expression of microRNAs 143 and 145 was ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.19-26797
更新日期：2019-05-01 00:00:00
abstract：PURPOSE:Classic studies have demonstrated that corneal epithelial cell density in culture can alter the balance of stimulatory and inhibitory cytokines controlling the elaboration of collagenolytic activity by co-cultured stromal cells. The current study attempts to bring the understanding of this mechanism to a molecu...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1997-02-01 00:00:00
abstract：:The properties of the oscillatory potentials (OPs) of the mudpuppy electroretinogram (ERG) were studied and compared with the properties of the b-wave of the ERG and the proximal negative response (PNR). Both transretinal and intraretinal ERGs were recorded in response to full-field as well as 200 and 500 microgram sp...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1978-12-01 00:00:00
abstract：:Upper eyelid movements were recorded in nine human subjects by mounting a miniature coil of wire directly on the eyelid and subjecting the search coil to a vertically directed alternating magnetic field. The metrics of blinks and lid movements accompanying saccades were described by "main sequence" relationships, link...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1991-12-01 00:00:00
abstract：:Iron is a potent generator of oxidative damage whose levels increase with age, potentially exacerbating age-related diseases. Several lines of evidence suggest that iron accumulation may be a factor in age-related macular degeneration (AMD). AMD retinas have more iron within the photoreceptors, RPE, and drusen than do...
journal_title：Investigative ophthalmology & visual science
pub_type：
doi：10.1167/iovs.06-0568
更新日期：2006-11-01 00:00:00
abstract：PURPOSE:To establish whether fucoidin, by blocking the adhesion of leukocytes on the limbal vascular endothelium, prevents extravasation of the cells from the blood stream into the limbal stroma and the wounded area after corneal injury. Successful leukocyte blocking enabled investigation of the influence of leukocytes...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1999-03-01 00:00:00
abstract：PURPOSE:To develop models for assessing the differential growth of the fetal face along its horizontal and vertical axes, as well as of the orbit and the eye. METHODS:Normal human fetuses (n = 205), whose gestational ages ranged from 15.5 to 41 weeks of amenorrhea, were examined. Orbitofacial parameters were as follow...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
abstract：PURPOSE:To investigate the capacity for rapid saccade adaptation in Williams-Beuren Syndrome (WBS), a genetic neurodevelopmental disorder, in which it has been observed that saccadic accuracy is severely reduced. METHODS:Saccade amplitude modification was elicited by backward steps (30% of target eccentricity) during ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.05-0617
更新日期：2006-04-01 00:00:00
abstract：PURPOSE:To compare EyeCam (Clarity Medical Systems, Pleasanton, CA) imaging with gonioscopy for detecting angle closure. METHODS:In this prospective, hospital-based study, subjects underwent gonioscopy by a single observer and EyeCam imaging by a different operator. EyeCam images were graded by two masked observers. T...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.09-4418
更新日期：2010-06-01 00:00:00
abstract：PURPOSE:To examine the in vitro properties of gap junctions on the isolated rabbit ciliary epithelium. METHODS:Intracellular potential was measured and lucifer yellow (5% in 1 M LiCl) was iontophoretically injected into a ciliary epithelial cell. Fixated tissue was examined with a laser confocal microscope. RESULTS:D...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1994-04-01 00:00:00
abstract：PURPOSE:To investigate the association of 25-hydroxyvitamin D with AMD. METHODS:A population-based, cross-sectional study using a nationwide, systemic-stratified, multistage-clustered sampling method involved a total of 17,045 subjects older than 40 years who participated in the Korean National Health and Nutrition Ex...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章,多中心研究
doi：10.1167/iovs.14-14763
更新日期：2014-07-11 00:00:00
abstract：PURPOSE:The pharmacokinetics of ophthalmic biotherapeutics are difficult to determine in human vitreous humor. Because of the high transparency of living tissue to near-infrared (NIR) light, the temporal changes in vitreous concentrations of a biomolecule labeled with an NIR fluorescent probe can be monitored in situ w...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.11-7790
更新日期：2011-09-01 00:00:00
abstract：PURPOSE:Changes in gene expression were investigated after treatment of cultured human retinal pigment epithelial (RPE) cells with vitreous. This may have implications for proliferative diseases such as proliferative vitreoretinopathy. METHODS:Cells were cultured in the presence or absence of human vitreous, and gene ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1998-10-01 00:00:00
abstract：PURPOSE:To determine the prevalence and incidence of epiretinal membranes (ERM) in eyes with inactive extramacular cytomegalovirus (CMV) retinitis in patients with acquired immune deficiency syndrome (AIDS). METHODS:A case-control report from a longitudinal multicenter observational study by the Studies of the Ocular ...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章,多中心研究
doi：10.1167/iovs.14-14479
更新日期：2014-06-12 00:00:00
abstract：:Linear nonperforating incisions were made in the corneas of 2-week-old and 2-year-old rabbits. The resulting wounds were examined by light microscopy and transmission and scanning electron microscopy. A corneal incision of a 2-week-old rabbit produced a wide gaping wound caused by retraction of the cut stromal lamella...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：1982-11-01 00:00:00
abstract：PURPOSE:To explore the effect of lateral tension as a survival factor for retinal explants in vitro. The central nervous system (CNS) resides in a highly mechanical milieu. However, the importance of biomechanical homeostasis for normal CNS function has not been extensively explored. Diseases in which normal mechanical...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.12-11420
更新日期：2013-03-13 00:00:00
abstract：PURPOSE:Lysophosphatidic acid (LPA) is a phospholipid growth factor that stimulates proliferation, chemotaxis, cation currents, and K(+) currents in retinal pigment epithelial (RPE) cells. LPA receptor transduction was analyzed in human and rat RPE cells. METHODS:Cells were cultured with standard methods, and signalin...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：2002-07-01 00:00:00
abstract：PURPOSE:To determine directional changes in peripheral corneal thickness and corneal astigmatism over a range of severity of Fuchs' endothelial corneal dystrophy (FECD). METHODS:Eyes with FECD were categorized as mild, moderate, or advanced according to the area and confluence of guttae and the presence of clinical ed...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.15-17311
更新日期：2015-09-01 00:00:00
abstract：PURPOSE:To characterize the features and possible mechanism of plus disease in the mouse oxygen-induced retinopathy (OIR) model for retinopathy of prematurity. METHODS:Wild-type and Adam (A Disintegrin And Metalloproteinase) knockout mice were exposed to 75% oxygen from postnatal day 7 to 12 (P7 to P12) (hyperoxia), t...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.12-11492
更新日期：2013-08-07 00:00:00
abstract：PURPOSE:It is well documented that grafting of cells in the subretinal space of Royal College of Surgeons (RCS) rats limits deterioration of vision and loss of photoreceptors if performed early in postnatal life. What is unclear is whether cells introduced later, when photoreceptor degeneration is already advanced, can...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.07-0992
更新日期：2008-01-01 00:00:00
abstract：PURPOSE:Metabolism and transport of glutathione (GSH), the endogenous thiol antioxidant, in conjunctival tissue to date are poorly understood. The purpose of the present study was to define transport characteristics of GSH in primary cultured rabbit conjunctival epithelial cells (RCECs). METHODS:RCECs were grown on me...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：
更新日期：2002-04-01 00:00:00
abstract：PURPOSE:To investigate the effect of ABCA4 mutation status on lipofuscin-related quantitative autofluorescence (qAF) in humans and on bisretinoid accumulation in mice. METHODS:Genotyped parents (n = 26; age 37-64 years) of patients with biallelic ABCA4-related retinopathy underwent in-depth retinal phenotyping includi...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.15-17629
更新日期：2015-12-01 00:00:00
abstract：PURPOSE:To evaluate the histologic effects and clinical outcomes of high-intensity focused ultrasound (HIFU) delivered by miniaturized annular transducers for ciliary body coagulation in an animal study. METHODS:Eighteen eyes of 18 rabbits were insonified with a ring comprising a six-sector transducer, to produce a 12...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.09-5135
更新日期：2010-10-01 00:00:00
abstract：PURPOSE:To investigate the effect of hyperbaric oxygen (HBO) chamber treatment in mouse models of retinal ischemia. METHODS:Unilateral central retinal artery occlusion (CRAO) or optic nerve crush (ONC) was induced in 50 mice each, of which 30 were treated with 100% oxygen at 2 atm for 90 minutes immediately after inju...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.11-7574
更新日期：2011-09-29 00:00:00
abstract：PURPOSE:Juvenile monkeys being trained on smooth-pursuit tasks exhibit ocular oscillations resembling pendular nystagmus. The purpose of this study was to analyze these oscillations, the effects of gabapentin on them, and responses of cerebellar floccular neurons to understand possible neuronal mechanisms. METHODS:Fou...
journal_title：Investigative ophthalmology & visual science
pub_type： 杂志文章
doi：10.1167/iovs.10-5903
更新日期：2011-06-01 00:00:00
