A Phase 3 interventional study of Apraclonidine Ophthalmic Solution, 0.125% Unit Dose Preservative Free and Vehicle in Ocular Hyperemia, sponsored by Alcon Research. Recruiting at 9 sites in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-16.
Sponsored by Alcon Research (part of Alcon) · Phase 3, Interventional, and Treatment
The purpose of this study is to evaluate the efficacy and safety of an investigational ophthalmic solution in adults with ocular redness due to minor eye irritations.
Eligible subjects will be expected to attend a total of 3 in-office study visits over a period of approximately 1 week. Subjects will receive a single dose of the study treatment in each eye on Day 1 (Visit 2). Eye redness will be assessed before and after instillations at prespecified timepoints.
98 studies on the registry are indexed under Hyperemia; 44 are open to participants now.
This study's planned enrollment of 230 is above the median of 68 across 51 interventional studies indexed under Hyperemia.
Browse Hyperemia studies →Alcon Research is the lead sponsor of 624 studies on the registry; 9 are open to participants now.
Of its 112 completed or terminated interventional studies of FDA-regulated products, 102 (91%) have results posted.
Counted across the registry records on this site, refreshed daily.
Key Inclusion Criteria:
Key Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
One drop in each eye on Day 1 (single dose)
Drug: Apraclonidine Ophthalmic Solution, 0.125% Unit Dose Preservative Free
One drop in each eye on Day 1 (single dose)
Drug: Vehicle
Investigational ophthalmic solution applied topically to the eye in a unit dose preservative free (UDPF) formulation
Also known as: FID 123472, Apraclonidine 0.125% UDPF
Inactive ingredients of FID 123472 applied topically to the eye as an ophthalmic solution in a unit dose preservative free (UDPF) formulation
Change from baseline in investigator-assessed ocular redness at 15 minutes post-instillation on Day 1 (Visit 2)
Ocular redness will be assessed by the investigator and recorded per the Ora Calibra® Ocular Hyperemia Scale, which ranges from 0 to 4 in half-point increments (0.0 = none; 1.0 = mild redness; 2.0 = moderate redness; 3.0 = severe redness; and 4.0 = extremely severe redness). Change from baseline, calculated as post-instillation minus baseline score, can range between -4 and +2.5. Positive values indicate increased ocular redness (worsening), zero indicates no change, and negative values indicate improvement (decrease in severity). This is a co-primary endpoint.
Time frame: Baseline (Day 1 pretreatment); 15 minutes post-instillation (Day 1)
Change from baseline in investigator-assessed ocular redness at 840 minutes (14 hours) post-instillation on Day 2 (Visit 3)
Ocular redness will be assessed by the investigator and recorded per the Ora Calibra® Ocular Hyperemia Scale, which ranges from 0 to 4 in half-point increments (0.0 = none; 1.0 = mild redness; 2.0 = moderate redness; 3.0 = severe redness; and 4.0 = extremely severe redness). Change from baseline, calculated as post-instillation minus baseline score, can range between -4 and +2.5. Positive values indicate increased ocular redness (worsening), zero indicates no change, and negative values indicate improvement (decrease in severity). This is a co-primary endpoint.
Time frame: Baseline (Day 1 pretreatment); 840 minutes (14 hours) post-instillation (Day 2)
Change from baseline in investigator-assessed ocular redness at 1 minute post-instillation on Day 1 (Visit 2)
Ocular redness will be assessed by the investigator and recorded per the Ora Calibra® Ocular Hyperemia Scale, which ranges from 0 to 4 in half-point increments (0.0 = none; 1.0 = mild redness; 2.0 = moderate redness; 3.0 = severe redness; and 4.0 = extremely severe redness). Change from baseline, calculated as post-instillation minus baseline score, can range between -4 and +2.5. Positive values indicate increased ocular redness (worsening), zero indicates no change, and negative values indicate improvement (decrease in severity).
Time frame: Baseline (Day 1 pretreatment); 1 minute post-instillation (Day 1)
Change from baseline in investigator-assessed ocular redness at 960 minutes (16 hours) post-instillation on Day 2 (Visit 3)
Ocular redness will be assessed by the investigator and recorded per the Ora Calibra® Ocular Hyperemia Scale, which ranges from 0 to 4 in half-point increments (0.0 = none; 1.0 = mild redness; 2.0 = moderate redness; 3.0 = severe redness; and 4.0 = extremely severe redness). Change from baseline, calculated as post-instillation minus baseline score, can range between -4 and +2.5. Positive values indicate increased ocular redness (worsening), zero indicates no change, and negative values indicate improvement (decrease in severity).
Time frame: Baseline (Day 1 pretreatment); 960 minutes (16 hours) post-instillation (Day 2)
Plan to share: No
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.