Clinical trials: Pupil
Emmetropia, Myopia
Effects of Light on the Choroid and Pupil
Monochromatic light creates longitudinal chromatic aberration, with short wavelength blue light forming a focal point in front of the retina and long wavelength red light forming a focal point behind the retina.
- Trial name
- NCT05852782
- Testing
- White Light therapy, Blue light therapy, Red light therapy
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- University of Houston
Pupil Constriction, Iris Floppiness
Clinical Factors Associated Floppy Iris
This study is planned to investigate the incidence of intraoperative floppy iris and its relationship with pseudoexfoliation, diabetes, hypertension as well as systemic alpha-1 adrenergic blocker use.
- Conditions
- Pupil Constriction, Iris Floppiness, Iris Prolapsus From the Wound
- Trial name
- NCT00472888
- Where
- Turkey (Türkiye)
- Volunteers
- 500 people, healthy volunteers welcome
- Sponsor
- Baskent University
Light Sensitivity
Eye Movement Behaviour and Pupil Size in Natural Outdoor and Indoor Scenes
In this study, the researchers will be using eye tracking and detailed lighting measurements to understand how different types of indoor and outdoor lighting affect the eye movements and pupil sizes of our participants.
- Trial name
- NCT05971238
- Testing
- Indoor vs. outdoor scenes
- Where
- Germany
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- Technical University of Munich
Obesity
Evaluation of California's SB 19 Pupil Nutrition Act
Four California school districts will be randomized to early implementation of California's SB 19 Pupil Nutrition Act or to business as usual.
- Trial name
- NCT00067847
- Testing
- State-directed nutrition policy change
- Where
- United States
- Volunteers
- 5,020 people, healthy volunteers welcome
- Sponsor
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Measurement of Pupil Diameter
Effects of Sevoflurane and Propofol on Light Flash Evoked Pupillometry
Null hypothesis (HO): There will be no difference in pupillometry readings when using any of the maintenance anesthetic techniques within subjects.
- Trial name
- NCT00695890
- Where
- United States
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- University of Medicine and Dentistry of New Jersey
Caffeine, Alcohol
Investigating the Effect of Caffeine and Alcohol on Pupil Dynamics
The goal of this study is to understand how caffeine and alcohol affect the ocular and physiological systems, especially how the pupil (the aperture in the colored part of the eye) responds to light.
- Conditions
- Caffeine, Alcohol, Pupillary Response, Eye Movements
- Trial name
- PAC (NCT07625358)
- Testing
- Caffeine administration, Alcohol (Ethanol)
- Where
- Singapore
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- National University of Singapore
Relative Afferent Pupil Defect (RAPD)
Measuring Relative Afferent Pupillary Defect
The goal of this prospective reliability study is to test the effectiveness of a commercially available, off-the-shelf virtual reality head-mounted display (VR HMD) and machine learning (ML) algorithms in detecting Relative…
- Trial name
- RAPD (NCT05799066)
- Testing
- Swinging Light test, Virtual Reality Head-Mounted Display (VR HMD)
- Where
- United States
- Volunteers
- 71 people, healthy volunteers welcome
- Sponsor
- The University of Texas Medical Branch, Galveston
Sexual Harassment
Evaluation of Virtual Course to Increase Knowledge in Sexual Harassment,Prevention and Sanction Policies of a University
Sexual harassment is the behavior of sexual or sexist connotation unwanted by the affected person. Despite being considered as gender-based violence, victims of sexual harassment can be of both sexes.
- Trial name
- NCT04021849
- Testing
- Face-to-face Class, Asynchronous Virtual Class
- Where
- Peru
- Volunteers
- 93 people, healthy volunteers welcome
- Sponsor
- Universidad Peruana Cayetano Heredia
Chronic Pain Due to Injury
Effects of Intramuscular (IM) Oxytocin on Pupil Diameter and Heart Rate Variability (HRV)
The goal of this study is to test the effects of oxytocin on heart rate variability and pupil diameter, both of which have subtle effects on the activity rate of the autonomic nervous system.
- Trial name
- NCT04105998
- Testing
- Oxytocin
- Where
- United States
- Volunteers
- 22 people, healthy volunteers welcome
- Sponsor
- Wake Forest University Health Sciences
Retinitis Pigmentosa, Leber's Hereditary Optic Neuropathy
Pupil Dynamics and Color Vision for the Detection of Eye Diseases
The development of new oculometry techniques allows fine and dynamic measurements of pupillary diameter and use in routine clinical practice.
- Conditions
- Retinitis Pigmentosa, Leber's Hereditary Optic Neuropathy, Stargardt Disease
- Trial name
- PupDyn (NCT04909398)
- Testing
- Dynamic pupillometry sessions
- Where
- France
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Centre Hospitalier National d'Ophtalmologie des Quinze-Vingts
Intraocular Pressure
The Effect of Brimonidine on Intraocular Pressure When Dilating Routine Patients
This an interventional study looking at two different sequences of pre-operative eye drops, to determine which order is more effective in reducing intraocular pressure with pupil dilation.
- Trial name
- NCT03139708
- Testing
- Alphagan, Phenylephrine, Tropicamide
- Where
- United States
- Volunteers
- 5 people, healthy volunteers welcome
- Sponsor
- Wake Forest University Health Sciences
High-intensity Interval Training
Effect of a 4-week Fun Fast Interval Training (FFIT) Activity Programme on Physical Fitness and Quality of Life in Adolescent School Pupils
Low-volume high-intensity interval exercise training may improve aspects of health and fitness in young people, but the effect of this type of exercise on quality of life has yet to be assessed.
- Trial name
- NCT02759432
- Testing
- High-intensity interval exercise training
- Where
- United Kingdom
- Volunteers
- 132 people, healthy volunteers welcome
- Sponsor
- Teesside University
Full Spectrum
A Self-controlled Study of the Effect of Partial Spectral Absence of Visible Light on the Pupil
Previous studies have shown that the spectrum of light influences myopia. LED lights with a partially absent light spectrum increase the risk of myopia progression compared to LEDs with a full spectrum, potentially mediated by…
- Trial name
- NCT06501131
- Testing
- full-spectrum light exposure, specific spectrum absence light exposure
- Volunteers
- 66 people, healthy volunteers welcome
- Sponsor
- Zhongshan Ophthalmic Center, Sun Yat-sen University
Mydriasis
Safety and Efficacy of Phenylephrine 2.5%-Tropicamide 1% Microdose Ophthalmic Solution for Pupil Dilation
This study evaluated pupil dilation after administration of fixed combination tropicamide-phenylephrine (TR/PH) vs. placebo. Participants attended 3 visits.
- Trial name
- MIST-2 (NCT03751098)
- Testing
- Tropicamide/Phenylephrine ophthalmic solution (TR/PE)
- Where
- 2 sites in United States
- Volunteers
- 76 people, healthy volunteers welcome
- Sponsor
- Eyenovia Inc.
Cataract, Myopia
Evaluating the Effect of Laser Vision Surgery, Phakic Intraocular Lens Implantation, Cataract Surgery, and Pupil Dilation on the Iris Recognition Scanner Function of Smartphone
This study included patients who visit for refractive surgery (photorefractive keratectomy, photorefractive keratectomy with with corneal collagen cross linking, laser in situ keratomileusis, small incision lenticule extraction)…
- Conditions
- Cataract, Myopia, Myopic Astigmatism
- Trial name
- NCT02939001
- Testing
- iris recognition scanner
- Where
- South Korea
- Volunteers
- 25 people, healthy volunteers welcome
- Sponsor
- Yonsei University
Eye Cyclorotation Degree, Pupil Shift
Evaluation of Position-induced Cyclorotation Between Wavefront Measurement and Refractive Surgery by the Iris Registration Method
Cyclorotation of eyes may be affected by motion and orientation of the head and body. An automated alignment method with the technique of iris recognition was used to assess the amount and orientation of position-induced…
- Trial name
- NCT00943163
- Where
- Taiwan
- Volunteers
- 93 people, healthy volunteers welcome
- Sponsor
- National Taiwan University Hospital
Regional Anesthesia, Horner Syndrome
Cerebral Blood Flow Evaluation With Trancranial Doppler After Interscalene Nerve Block
The purpose of this study is to assess cerebral blood flow velocity (CBFV) following regional anesthesia for shoulder surgery. The results of this study will help to further understand the physiologic effect of the interscalene…
- Conditions
- Regional Anesthesia, Horner Syndrome, Cerebral Blood Flow
- Trial name
- CBF-TCD (NCT04642612)
- Testing
- TCD Measurement
- Where
- United States
- Volunteers
- 10 people, healthy volunteers welcome
- Sponsor
- Stanford University
no Condition, Electroencephalography
Testing the Noradrenergic Hypothesis of Transcutaneous Vagus Nerve Stimulation
This study investigates the capacity of non-invasive vagus nerve stimulation, applied at the ear, to alter to measures of locus coeruleus output pupil diameter and EEG alpha power.
- Conditions
- no Condition, Electroencephalography, Pupil Diameter
- Trial name
- NCT04455295
- Testing
- Transdermal Vagus Nerve Stimulation (tVNS)
- Where
- United States
- Volunteers
- 55 people, healthy volunteers welcome
- Sponsor
- Arkansas Tech University
Autism Spectrum Disorders
Social Interactions: Ocular Explorations and Pupillometry in Autism
The primary objective of this work will first to characterize in typical childhood, visual exploratory behavior and pupillary response associated with salience of human social stimuli (faces and body movements), and then to…
- Trial name
- ISEOP (NCT01647295)
- Where
- France
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Institut National de la Santé Et de la Recherche Médicale, France
Myopia
Side Effects of Atropine (SEA) Study
This study will perform several objective and subjective measurements of the eye and vision before and after a week of using 0.01% concentration atropine drops.
- Trial name
- SEA (NCT03593044)
- Testing
- 0.01% concentration atropine drops
- Where
- United States
- Volunteers
- 31 people, healthy volunteers welcome
- Sponsor
- Jeffrey J. Walline, OD PhD