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 5 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 caused by minor eye irritations.
Eligible subjects will be expected to attend a total of 6 in-office study visits over a period of approximately 10 weeks. Subjects will receive a single dose of study treatment in each eye (either Apraclonidine 0.125% UDPF or Vehicle) on Day 1, after which subjects will be instructed to self-administer one drop in each eye twice daily at home for a total of approximately 8 weeks (Days 2-55), with the last dose administered on Day 56 in office. Subjects will then return for the final study visit on Day 63, following a 1-week treatment discontinuation. Eye redness will be assessed before and after instillation at prespecified timepoints.
98 studies on the registry are indexed under Hyperemia; 44 are open to participants now.
This study's planned enrollment of 178 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.
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.
One drop in each eye on Day 1, followed by one drop in each eye twice daily (approximately 12 hours apart, but not less than 11.5 hours apart) beginning the day following Day 1 up until the day prior to Day 56. On the day of Day 56, subjects will receive the last dose in-office.
Drug: Apraclonidine Ophthalmic Solution, 0.125% Unit Dose Preservative Free
One drop in each eye on Day 1, followed by one drop in each eye twice daily (approximately 12 hours apart, but not less than 11.5 hours apart) beginning the day following Day 1 up until the day prior to Day 56. On the day of Day 56, subjects will receive the last dose in-office.
Drug: Vehicle
Investigational ophthalmic solution applied topically to the eye in a unit dose preservative free 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 formulation
Change from baseline in investigator-assessed ocular redness at 15 minutes post-instillation on Day 1
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 600 minutes post-instillation on Day 1
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); 600 minutes post-instillation (Day 1)
Change from baseline in investigator-assessed ocular redness at 1 minute post-instillation on Day 1
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 720 minutes post-instillation on Day 1
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); 720 minutes post-instillation (Day 1)
Change from baseline in investigator-assessed ocular redness at 30 seconds post-instillation on Day 1
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); 30 seconds post-instillation (Day 1)
Number of subjects who achieve prespecified improvements from baseline in investigator-assessed ocular redness score in both eyes at 30 seconds post-instillation on Day 1
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). The 30-second score will be compared to the baseline score. The number of subjects with improvements as prespecified in the protocol will be reported.
Time frame: Baseline (Day 1 pretreatment); 30 seconds post-instillation (Day 1)
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 ↗
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