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Carrot power? study tests if eye vitamins boost sight in healthy people

NCT ID NCT06098677

Symptom relief Sponsor: Zhongshan Ophthalmic Center, Sun Yat-sen University Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at whether taking a daily supplement of lutein, zeaxanthin, and meso-zeaxanthin (natural pigments found in plants) can improve contrast sensitivity—the ability to see subtle differences in light and dark—in healthy Chinese adults aged 35 and older. Over 12 months, 220 participants will either receive the supplement or a placebo. The goal is to see if these nutrients can sharpen vision, even in people without eye disease.

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

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 220 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

May 2026

An estimate. Start dates often move.

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

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

35 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show 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: * Chinese subjects * Age 35 years or above * Monocular BCVA of 6/6 or better * No more than +/- 5 diopters spherical equivalence of refraction * No previous consumption of supplements containing macular carotenoids (L, Z and/or MZ) within the last 12 months * Without severe retinal diseases (eg. retinal detachment, glaucoma, macular hole, idiopathic epiretinal membrane, retinitis pigmentosa, and age-related macular degeneration (assessed by experienced ophthalmologists during ocular examination) Exclusion Criteria: * Unable to provide informed consent * With diagnosed diabetes * With severe systemic disease which affects physical mobility and successful follow-up * Contrast sensitivity at a spatial density of 6 cpd ≤ 1.5 % at baseline in the eye with better visual acuity * Subjects who plan to receive cataract surgery within the next year * Subjects who are unable to cooperate with the examinations during follow-ups, such as those who suffer from other serious systemic diseases or mental abnormalities * History of intraocular surgery (eg. cataract surgery, vitrectomy and retinal laser photocoagulation)

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Conditions

The condition(s) this trial relates to.

vision disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Vision disorders

How to take part

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  1. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  2. A doctor treating you

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More trials for these conditions

Other studies related to the condition(s) this trial covers.