Tiny doses of atropine: unlocking the Eye's response to slow nearsightedness
NCT ID NCT07674966
First seen Jun 30, 2026 · Last updated Jul 01, 2026 · Updated 1 time
Summary
This study investigates how low doses of atropine eye drops (0.01%, 0.02%, and 0.05%) affect pupil size and the eye's ability to focus in healthy adults aged 18 to 40. Researchers aim to compare different dosing methods and recovery times, and to see if iris color influences the effects. The findings could help optimize atropine treatment for myopia (nearsightedness).
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- atropine eye drops (0.01%, 0.02%, 0.05%)
- What this could lead to
- If successful, this could help refine dosing strategies for using low-dose atropine to slow myopia progression in children.
- What could go wrong
- This is a small, early-phase study in healthy adults, not patients. Results may not translate to real-world myopia treatment or predict long-term effects.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
-
24 people
The number who actually took part.
- Started
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Mar 2022
- Finished
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Oct 2022
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
-
18 to 40 years
- Sex
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Anyone
- Healthy volunteers
-
Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. Subjects may be male or female, of any race, and between 18-40 years old at the time of screening. 2. Patients must have best spectacle corrected visual acuity of at least 0.10 logMAR (20/25) in each eye. 3. Subjects must be willing and able to apply eye drops to their non-dominant eye and to return for all scheduled follow-up visits. Exclusion Criteria: 1. Subjects with any contraindication to atropine use (as listed on package insert). At the time of this submission, the only contraindication listed is: "Hypersensitivity or allergic reaction to any ingredient in formulation" 2. Subjects using monamine oxidase inhibitors (MAOIs). These are: Isocarboxazid (Marplan), Phenelzine (Nardil), Selegiline (Emsam), and Tranylcypromine (Parnate). 3. Subjects with a history of any of the following medical conditions: collagen vascular disease, autoimmune disease, immunodeficiency diseases, ocular herpes zoster or simplex, endocrine disorders (including, but not limited to active thyroid disorders and diabetes), lupus, and rheumatoid arthritis. 4. Subjects with a history of intraocular or corneal surgery (including cataract extraction), active ophthalmic disease or abnormality (including but not limited to, blepharitis, recurrent corneal erosion, dry eye syndrome, neovascularization \>1mm from limbus), clinically significant lens opacity, clinical evidence of trauma (including scarring). This includes any patient with open-angle glaucoma, regardless of medication regimen or control. Additionally, any patient with an intra-ocular pressure (IOP) greater than 21 mm Hg at baseline is specifically excluded from eligibility. Subjects with narrow angles (less than Van Herick angle of 3) will also be excluded. 5. Subjects who are pregnant, planning to become pregnant or breastfeeding during the course of the study.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
University of California, Berkeley
Berkeley, California, 94720-2020, United States
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