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Completed

NCT Number: NCT07674966

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

The goal of this clinical study is to learn about the short-term physiological effects of low-dose atropine in healthy volunteers. The study seeks to examine three questions related to low-dose topically applied ophthalmic atropine:

1. Does applying two drops of 0.01% atropine sulfate solution cause the same clinical effects as one drop of 0.02% atropine? 2. How quickly do the pupil responses and accommodative amplitudes recover following a dose of 0.01% atropine, 0.02% atropine, and 0.05% atropine? 3. Does applying a single drop of 0.02% atropine sulfate solution cause the same clinical effects in participants with light vs. dark iris colors? Participants will have their pupil size and accommodative status measured at appropriate intervals to answer the questions above.

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Key information

Age range

18 year–40 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

University of California, Berkeley

Berkeley, California, 94720-2020, United States

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Subjects may be male or female, of any race, and between 18-40 years old at the time of screening.
  • Patients must have best spectacle corrected visual acuity of at least 0.10 logMAR (20/25) in each eye.
  • 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

  • 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"
  • Subjects using monamine oxidase inhibitors (MAOIs). These are: Isocarboxazid (Marplan), Phenelzine (Nardil), Selegiline (Emsam), and Tranylcypromine (Parnate).
  • 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.
  • 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.
  • Subjects who are pregnant, planning to become pregnant or breastfeeding during the course of the study.

Treatment and study plan

Atropine 0.01% Ophthalmic Solution

Drug

Two drops of 0.01% atropine sulfate solution

Atropine 0.02% Ophthalmic Solution

Drug

One drop of 0.02% atropine sulfate solution

Atropine 0.05% Ophthalmic Solution

Drug

Atropine 0.05% Ophthalmic Solution

Primary outcomes

  1. Minimum pupil size

    Time frame: 1-24 hours after drop application

    Dynamic pupil responses to a single pulse of light were measured 1 hour, 2 hours, 4 hours, 8 hours, and 24 hours after instilling the drop(s). The smallest pupil size (maximum pupil restriction) was used as the primary outcome measure.

Secondary outcomes

  1. Accommodative Amplitude

    Time frame: 1-24 hours after drop application

    Subjective accommodative response was measured via the pull-away AA method.

Sponsors and collaborators

Lead sponsor

University of California, Berkeley

Other

Registry information

Important dates

Study start
2022
Primary completion
2022
Study completion
2022
First posted
Jun 30, 2026
Registry last updated
Jun 30, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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