Pilot Study of Normative Range of Field of Binocular Single Vision in Adults in Singapore
Recruiting now
Conditions studied: Binocular Visual Function
In brief
The assessment and monitoring of the field of binocular single vision remains a crucial aspect of ophthalmological care, yet current clinical practice relies on normative standards established by Feibel \& Roper-Hall in 1974 that present significant limitations for contemporary application. The original study, conducted with a demographically homogeneous Caucasian population in St Louis using only "several" normal individuals, raises concerns regarding its applicability to Asian populations, particularly in Singapore, where ethnic and genetic factors may influence ocular characteristics. The limited sample size significantly increases the likelihood of Type II errors, whilst the temporal gap of over five decades introduces additional concerns regarding population changes, environmental factors, and advances in measurement techniques that have not been incorporated into current normative data. Given these substantial limitations in demographic representation, statistical power, and temporal relevance, there exists a pressing need to establish population-specific normative data for the field of binocular single vision in Singapore's adult population, which would provide more clinically relevant reference values and potentially improve diagnostic accuracy for ocular conditions in the local context.
Key facts
- Study ID
- NCT07257341
- Run by
- Tan Tock Seng Hospital
- People needed
- 30
- Starts
- 2025-10-15
- Expected to finish
- 2026-10-14
- Last updated by the study team
- 2026-01-09
Who can join
Age: 21 and older, up to 59. Sex: any. Healthy volunteers: accepted.
You may qualify if…
- 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
You may not qualify if…
- 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
Where it is running
- Tan Tock Seng Hospital — Singapore, Singapore, Singapore (enrolling)
Full record on ClinicalTrials.gov
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