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Outdated eye test norms get a modern update for asian adults

NCT ID NCT07257341

Knowledge-focused Sponsor: Tan Tock Seng Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This pilot study will measure the normal range of binocular single vision—the ability to use both eyes together as one—in 30 healthy Asian adults aged 21 to 59 in Singapore. Current standards are based on a small 1974 study of Caucasians, which may not apply to today's Singaporean population. Participants will undergo a single vision test using a special machine to map their field of single vision, helping create more accurate local reference values.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this study could provide more accurate reference values for diagnosing binocular vision problems in Asian populations, improving eye care in Singapore.
What could go wrong
This is a small pilot study with only 30 participants, so results may not fully represent the broader population. It is observational and does not test any treatment.

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.

Participants

About 30 people

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

Started

Oct 2025

Expected to finish

Oct 2026

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.

Who is studied

Healthy Individuals

Ages

21 to 59 years

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: * Age: 21 to 59 years old * Gender: Males or females * Ethnicity: Asian descent. * Language comprehension: Able to understand verbal spoken instructions in: • British/American English * Mandarin Chinese * Bahasa Melayu * Protocol compliance: Ability to comply with the study protocol, as determined by the investigator's judgment * Consent capacity: Must be able to understand and provide informed consent, with signed informed consent form required before any study assessments Exclusion Criteria: \- Communication barrier: Unable to understand verbal spoken instructions * Medical history: * Any facial trauma * Any ocular trauma * Any head trauma * Any history of ocular disease * Any history of ocular surgery * Systemic condition(s) * Near visual acuity: o Right eye \& Left eye monocularly, binocularly unaided near vision: worse than N6 at 40cm from participant's nose * Ocular alignment: o Prism cover test at near (30cm) of equal or greater than 10 prism diopters at these positions of gaze: * Primary gaze * Right gaze * Left gaze * Up gaze * Down gaze * Extraocular movement: o Extraocular movement of over-action or under-action of equal or greater than 0.5 in any of the nine cardinal positions of gaze * Confrontational Visual field: o Abnormal monocular visual field on confrontational visual field test * Hess chart test o Abnormal or asymmetry in pattern of extraocular muscle action in Hess chart test

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Conditions

The condition(s) this trial relates to.

binocular vision disease

As listed by the trial registrant

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

Binocular visual function

How to take part

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  1. The places running it

    1 site. The list below names each one and where it is.

  2. 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 ↗

  3. A doctor treating you

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Contacts and locations

Locations

  • Tan Tock Seng Hospital

    RECRUITING

    Singapore, Singapore, 308433, Singapore

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