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Showing 25–45 of 21 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Pupil Clear all
Completed Phase 4 Interventional Results available

Safety and Efficacy of Fixed Combination Phenylephrine-Tropicamide for Pupil Dilation

NCT06217796
View directory record Official record
Conditions
Mydriasis
Interventions
MydCombi
Combination Product
Lead sponsor
Eyenovia Inc.
Industry
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Apr 17, 2024 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 2 Interventional Results available

Pupil Dilation for Treatment of IFIS

NCT03760185
View directory record Official record
Conditions
Intraoperative Floppy Iris Syndrome
Interventions
Brimonidine Tartrate
Drug
Lead sponsor
Denver Health and Hospital Authority
Other
Eligibility
18 Years to 100 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2020
U.S. locations
1
States / cities
Denver, Colorado
Source: ClinicalTrials.gov public record
Updated Apr 19, 2022 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of Nyxol (0.75% Phentolamine Ophthalmic Solution) to Reverse Pharmacologically-Induced Mydriasis

NCT04620213
View directory record Official record
Conditions
Mydriasis, Dilation
Interventions
Phentolamine Ophthalmic Solution 0.75%, Phentolamine Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
12 Years and older
Enrollment
185 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
12
States / cities
Newport Beach, California • San Diego, California • Longwood, Florida + 9 more
Source: ClinicalTrials.gov public record
Updated Sep 10, 2023 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of Ophthalmic Phentolamine Mesylate to Reverse Pharmacologically Induced Mydriasis

NCT04024891
View directory record Official record
Conditions
Mydriasis, Dilation
Interventions
Phentolamine Mesylate Ophthalmic Solution 1%, Phentolamine Mesylate Ophthalmic Solution Vehicle (Placebo)
Drug · Other
Lead sponsor
Ocuphire Pharma, Inc.
Industry
Eligibility
18 Years to 45 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
4
States / cities
Pittsburg, Kansas • Lexington, Kentucky • Athens, Ohio + 1 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2023 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Wearing-Off Period of Pharmacological Dilation and Anisocoria

NCT05238233
View directory record Official record
Conditions
Anisocoria
Interventions
Tropicamide, 1% Pilocarpine, Proparacaine Hydrochloride, Tono pen AVIA, VG4 Gonio, Reichert phoropter
Drug · Device
Lead sponsor
Prisma Health-Upstate
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
Greenville, South Carolina
Source: ClinicalTrials.gov public record
Updated Mar 6, 2023 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 1 Interventional

An Investigation of Topical Ophthalmic Low-Dose Atropine on Pupil Size and Accommodation

NCT07674966
View directory record Official record
Conditions
Myopia
Interventions
Atropine 0.01% Ophthalmic Solution, Atropine 0.02% Ophthalmic Solution, Atropine 0.05% Ophthalmic Solution
Drug
Lead sponsor
University of California, Berkeley
Other
Eligibility
18 Years to 40 Years
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Jun 29, 2026 · Synced Jul 23, 2026, 6:24 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Pupillometry and Locus Coeruleus Activation (PuLCA)

NCT04579653
View directory record Official record
Conditions
Visual Impairment, Ocular Illness
Interventions
transcutaneous electrical nerve stimulation devices
Device
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 30 Years
Healthy volunteers
Accepts healthy volunteers
Timeline
2023
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Dec 18, 2023 · Synced Jul 23, 2026, 6:24 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Effects of Sevoflurane and Propofol on Light Flash Evoked Pupillometry

NCT00695890
View directory record Official record
Conditions
Measurement of Pupil Diameter
Interventions
Not listed
Lead sponsor
University of Medicine and Dentistry of New Jersey
Other
Eligibility
18 Years to 65 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2009
U.S. locations
1
States / cities
Newark, New Jersey
Source: ClinicalTrials.gov public record
Updated Dec 18, 2014 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

tVNS Responsiveness Testing With Pupil Size

NCT06335199
View directory record Official record
Conditions
Stroke
Interventions
Unilateral Left tVNS stimulation, Bilateral tVNS stimulation, Unilateral Left Sham stimulation, Bilateral Sham stimulation, Unilateral Right tVNS stimulation, Unilateral Right Sham stimulation
Procedure
Lead sponsor
Georgia Institute of Technology
Other
Eligibility
18 Years to 89 Years
Enrollment
21 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Oct 28, 2025 · Synced Jul 23, 2026, 6:24 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Effect of Brimonidine Tartrate Ophthalmic Solution 0.15% on Pupil Diameter in Normal Eyes

NCT00413751
View directory record Official record
Conditions
Healthy
Interventions
Brimonidine tartrate ophthalmic solution 0.15% (Alphagan P)
Drug
Lead sponsor
Walter Reed Army Medical Center
Federal
Eligibility
18 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Dec 19, 2006 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Side Effects of Atropine (SEA) Study

NCT03593044
View directory record Official record
Conditions
Myopia
Interventions
0.01% concentration atropine drops
Drug
Lead sponsor
Jeffrey J. Walline, OD PhD
Other
Eligibility
21 Years to 30 Years
Enrollment
31 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Dec 1, 2022 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Effects of Intramuscular (IM) Oxytocin on Pupil Diameter and Heart Rate Variability (HRV)

NCT04105998
View directory record Official record
Conditions
Chronic Pain Due to Injury
Interventions
Oxytocin, Placebo
Drug
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 66 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Nov 9, 2022 · Synced Jul 23, 2026, 6:24 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Cerebral Blood Flow Evaluation With Trancranial Doppler After Interscalene Nerve Block

NCT04642612
View directory record Official record
Conditions
Regional Anesthesia, Horner Syndrome, Cerebral Blood Flow
Interventions
TCD Measurement
Device
Lead sponsor
Stanford University
Other
Eligibility
18 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Sep 15, 2021 · Synced Jul 23, 2026, 6:24 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Cause of Pigment Dispersion Syndrome

NCT00005919
View directory record Official record
Conditions
Glaucoma, Healthy, Pigment Dispersion Syndrome
Interventions
Not listed
Lead sponsor
National Eye Institute (NEI)
NIH
Eligibility
Not listed
Enrollment
90 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2000 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Jul 23, 2026, 6:24 PM EDT
Completed No phase listed Observational

Reliability of Pupil Response to Acute Pain

NCT02628314
View directory record Official record
Conditions
Pain, Osteoarthritis
Interventions
Not listed
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2025
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Apr 28, 2026 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 3 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of Phenylephrine 2.5%-Tropicamide 1% Microdose Ophthalmic Solution for Pupil Dilation

NCT03751631
View directory record Official record
Conditions
Mydriasis
Interventions
Tropicamide 1%-Phenylephrine 2.5% ophthalmic solution (TR/PE), Tropicamide 1% ophthalmic solution (TR), Phenylephrine 2.5% ophthalmic solution (PE)
Drug
Lead sponsor
Eyenovia Inc.
Industry
Eligibility
Not listed
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Cypress, California
Source: ClinicalTrials.gov public record
Updated Mar 17, 2022 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Light on the Choroid and Pupil

NCT05852782
View directory record Official record
Conditions
Emmetropia, Myopia
Interventions
White Light therapy, Blue light therapy, Red light therapy, Darkness
Other
Lead sponsor
University of Houston
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated May 9, 2023 · Synced Jul 23, 2026, 6:24 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Head Injury-associated Photosensitivity and Pupillary Function (HIPP) Study

NCT01942564
View directory record Official record
Conditions
Head Injury, Traumatic Brain Injury (TBI), Photosensitivity, Photophobia
Interventions
Not listed
Lead sponsor
Ohio State University
Other
Eligibility
18 Years and older
Enrollment
40 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 24, 2017 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 3 Interventional Results available

A Randomized Study in Children Ages Birth Through Three Years Undergoing Unilateral Cataract Extraction With or Without Lens Replacement

NCT02132312
View directory record Official record
Conditions
Unilateral Cataract Extraction, Congenital Cataract
Interventions
OMS302, Phenylephrine HCl
Drug
Lead sponsor
Omeros Corporation
Industry
Eligibility
1 Day to 47 Months
Enrollment
78 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
11
States / cities
Los Angeles, California • Atlanta, Georgia • Chicago, Illinois + 8 more
Source: ClinicalTrials.gov public record
Updated Jul 21, 2021 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers

Topical 0.4% Ketorolac and Vitreoretinal Surgery

NCT00576329
View directory record Official record
Conditions
Surgery
Interventions
Ketorolac
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
76 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2007
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated May 13, 2014 · Synced Jul 23, 2026, 6:24 PM EDT
Completed Phase 2Phase 3 Interventional Accepts healthy volunteers Results available

Pupillary Unrest as an Indicator of Central Opioid Effect in Subjects 40-60 Years of Age

NCT05391555
View directory record Official record
Conditions
Opioid Toxicity, Pupillary Miosis, Respiratory Depression
Interventions
Remifentanil Hydrochloride, Pupillometry measurement
Drug · Device
Lead sponsor
University of California, San Francisco
Other
Eligibility
40 Years to 60 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated May 1, 2025 · Synced Jul 23, 2026, 6:24 PM EDT