Clinical trials: Retina; Change
Flicker-induced Vasodilatation
Effect of Breathing a Mixture of 92% Oxygen (O2) + 8% Carbon Dioxide (CO2) on Flicker Induced Blood Flow Changes in Ocular Perfusion
It has been shown that diffuse luminance flicker increases retinal and optic nerve head blood flow. This indicates that a neuro-vascular coupling between neural activity and blood flow exists in the retina as described previously…
- Trial name
- NCT00719342
- Testing
- Oxygen + Carbondioxide, full field flickering light at 12.5 Hz
- Where
- Austria
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- Medical University of Vienna
Electronic Cigarette Use, Retina; Change
Nicotine Influence on the Retina Following the Use of Electronic Cigarette
The marketing of electronic cigarettes (e-cigarettes) in 2003 was initially intended to present a healthier alternative to smokers.
- Trial name
- NCT05801419
- Testing
- RETI-port/scan 21, Zilia Ocular, OCT-A
- Where
- Canada
- Volunteers
- 44 people, healthy volunteers welcome
- Sponsor
- Christian Casanova
Epilepsy (Treatment Refractory), Epilepsy
Retinal OCT Changes and Biomarkers in Drug-Resistant Epilepsy
This prospective, longitudinal observational study investigates whether epilepsy involves a progressive neurodegenerative process.
- Trial name
- NCT07716930
- Where
- Turkey (Türkiye)
- Volunteers
- 250 people, healthy volunteers welcome
- Sponsor
- Kemal Tutkavul
Cataract, Diabetic Retinopathy
Diabetic Retinopathy and OCT-A Changes Post-cataract Surgery
The purpose of this study is to use optical coherence tomography angiography (OCT-A) to compare retinal vasculature after uncomplicated cataract surgery in patients with and without diabetic retinopathy.
- Conditions
- Cataract, Diabetic Retinopathy, Macular Edema Due to Diabetes Mellitus
- Trial name
- NCT04660006
- Testing
- Cataract surgery
- Where
- Canada
- Volunteers
- 170 people, healthy volunteers welcome
- Sponsor
- Uptown Eye Specialists
Ocular Physiology, Retina
Is There a Difference in Flicker Induced Vasodilatation Between Smokers and Non-Smokers?
Habitual smoking is associated with an increased risk of coronary artery disease, cerebral and peripheral vascular disease, including ocular diseases like age-related macular degeneration or diabetic retinopathy.
- Conditions
- Ocular Physiology, Retina, Blood Flow Velocity
- Trial name
- NCT00431730
- Testing
- flicker light stimulation
- Where
- Austria
- Volunteers
- healthy volunteers welcome
- Sponsor
- Medical University of Vienna
Preeclampsia (PE), Hypertension ,Pregnancy
Retinal and Choroidal Microcirculation in Preeclampsia: An OCTA Study
Preeclampsia is a multisystemic and multifactorial disorder that complicates pregnancy and is characterized by new-onset hypertension after the 20th week of gestation accompanied by proteinuria or systemic findings such as renal…
- Conditions
- Preeclampsia (PE), Hypertension ,Pregnancy, Retinal Microvascular Changes, Hypertensive Disorders of Pregnancy
- Trial name
- PE-OCTA (NCT07874191)
- Where
- Turkey (Türkiye)
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Muğla Sıtkı Koçman University
Ocular Inflammation
PGE2 Levels in Patient Treated With NSAIDs
The aim of this study is to determine vitreous levels of nonsteroidal antinflammatory drugs (NSAIDs) and prostaglandinE2 (PGE2) in eyes scheduled for vitrectomy. All patients received the study drugs for 3 days before surgery.
- Trial name
- NCT03597867
- Testing
- Dicloftil, Nevanac, Indom
- Where
- Italy
- Volunteers
- 104 people, healthy volunteers welcome
- Sponsor
- University of Trieste
Retinal Diseases
UHR-OCT and HD-OCT for Preretinal Membranes: ICG Versus Membrane Blue
Using the UHR-OCT and HD-OCT to evaluate early postoperative changes in patients with diagnosis preretinal membrane after successfully performed pars-plana vitrectomy and membrane peeling with two different types of dyes.
- Trial name
- NCT00437593
- Testing
- ppVE, MP, ICG, ppVE, MP, MB
- Where
- Austria
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- The Ludwig Boltzmann Institute of Retinology and Biomicroscopic Laser Surgery
Retinal Vascular
Physiologic Changes of Posterior Ocular Segment During the Menstrual Cycle
Changes of luteinizing hormone (LH), estrogen and progesterone during the menstrual cycle influence the ocular physiology in both anterior and posterior segments.
- Trial name
- NCT04731207
- Testing
- Optovue®
- Where
- Thailand
- Volunteers
- 39 people, healthy volunteers welcome
- Sponsor
- Khon Kaen University
Multiple Sclerosis
Using Optical Coherence Tomography to Capture Retinal Microvascular Changes Associated With Multiple Sclerosis
Recent studies have shown that people with multiple sclerosis (MS) who also have diseases related to vascular health such as high cholesterol, high blood pressure, diabetes, cardiovascular disease, and others, may end up more…
- Trial name
- OCT in MS (NCT01596881)
- Where
- United States
- Volunteers
- 101 people, healthy volunteers welcome
- Sponsor
- Oregon Health and Science University
Alzheimer Disease, Mild Cognitive Impairment
Atlas of Retinal Imaging in Alzheimer's Study
The Atlas of Retinal Imaging in Alzheimer's (ARIAS) study is a 5-year study examining the natural history of retinal imaging biomarkers associated with disease risk, disease burden, and disease progression in Alzheimer's disease…
- Conditions
- Alzheimer Disease, Mild Cognitive Impairment, Mild Dementia, Aging
- Trial name
- ARIAS (NCT03862222)
- Testing
- Retinal Imaging, Pupillometry, Contrast Sensitivity
- Where
- 4 sites in United States
- Volunteers
- 165 people, healthy volunteers welcome
- Sponsor
- University of Rhode Island
Myopia
Pharmacological and Non-pharmacological Treatment Effects on Children With Different Predicted Myopia Progression Rate
The goal of this clinical trial is to compare pharmacological and non-pharmacological treatment effects on the children with different predicted myopia progression rate measured by modified multifocal electroretinogram.
- Trial name
- NCT06282848
- Testing
- Atropine 0.05%, DIMS lens
- Where
- Hong Kong
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- The Hong Kong Polytechnic University
Healthy
Measurement of Retinal Venous Pressure Under Short-term Low-oxygen Environment
The hypothesis is that the pressure in the retinal veins increases under a short-term lack of oxygen and leads to a decreased blood circulation.
- Trial name
- NCT01771757
- Where
- Switzerland
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- University Hospital, Basel, Switzerland
Retinopathy of Prematurity
Changes in Vital Signs and Pupil Diameter Related to Pharmacologic Mydriasis in Premature Infants: A Randomized Double Blind Clinical Study
Retinopathy of prematurity (ROP) is one of the common anatomic causes of blindness among Filipinos, accounting for 47.7% of the cases.
- Trial name
- NCT04838665
- Testing
- 0.5% cyclopentolate and 2.5% phenylephrine, 0.5% tropicamide + 0.5% phenylephrine, 0.5% tropicamide + 0.5% phenylephrine with a cotton wick
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- University of the Philippines
Covid19
OCTA Study: Retinal Vascular Changes in Patients With SARS-CoV-2 Infection
This study evaluates the retinal vascular features using optical coherence tomography angiography in patients that have been affected by COVID-19.
- Trial name
- NCT04601012
- Testing
- Optical coherence tomography angiography
- Where
- Italy
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Federico II University
Obesity, Obesity, Morbid
Effects of Differences in Body Composition on Retina and Choroid
The goal of this observational study is to examine the effects of body composition differences on retinal and choroidal structures.
- Conditions
- Obesity, Obesity, Morbid, Body Composition
- Trial name
- NCT06888765
- Testing
- Optical Coherence Tomography (OCT) and Body Composition Analysis
- Where
- Turkey (Türkiye)
- Volunteers
- 261 people, healthy volunteers welcome
- Sponsor
- Bayram Meydan
Pediatric Disorder, Vitamin D Deficiency
Retinal Changes in Vitamin D Deficiency
Retinal tissue parameters of pediatric patients with vitamin D deficiency will be evaluated in this prospective case-control study. The patients will be divided into 2 groups according to the vitamin D level.
- Conditions
- Pediatric Disorder, Vitamin D Deficiency, Retinal Disease, Choroidal Disease
- Trial name
- VDD (NCT04891211)
- Testing
- Vitamin D deficiency
- Where
- Turkey (Türkiye)
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Adiyaman University
Healthy
Measurement of Total Retinal Blood Flow During Flicker Stimulation in Healthy Subjects
Neurovascular coupling or functional hyperemia is defined as an essential physiologic mechanism in the brain, which is necessary for the local adaption of blood flow to altered metabolic demands of the tissue.
- Trial name
- NCT02531399
- Testing
- FDOCT, LDV, DVA
- Where
- Austria
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Medical University of Vienna
Sepsis, Retinal Microcirculation Disorder
Ocular Microvascular Changes in Patients With Sepsis
This study evaluates differences in the ocular microcirculation between septic patients and healthy subjects and the course of ocular microvasculature in survivors and non-survivors over a 24 hours period of time in septic…
- Conditions
- Sepsis, Retinal Microcirculation Disorder, Conjunctiva; Disorder
- Trial name
- NCT04214743
- Testing
- Incident dark field videomicroscope from Braedius, Fundus camera from Optomed
- Where
- Lithuania
- Volunteers
- 76 people, healthy volunteers welcome
- Sponsor
- Lithuanian University of Health Sciences
Alzheimer Disease, Dementia
OCT Angiography and NRAI in Dementia
The primary goals of this study are to use optical coherence tomography (OCT) angiography (blood vessel mapping) to: 1. Detect retinal blood vessel and blood flow changes in participants with dementia. 2.
- Conditions
- Alzheimer Disease, Dementia, Mild Cognitive Impairment
- Trial name
- NCT03761381
- Testing
- Optical Coherence Tomography Angiography (OCTA) Imaging, Noninvasive Retinal Amyloid Imaging (NRAI)
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Oregon Health and Science University