deltatrials
Unknown OBSERVATIONAL NCT01312662

Towards Worldwide Comparability of Visual Acuity Assessment (VisComp)

Towards Worldwide Comparability of Visual Acuity Assessment A Pilot Study Comparing ETDRS Visual Acuity Charts, Projected Landolt Charts and the Freiburg Visual Acuity Test (FrACT) With a View to Developing a Mathematical Transformation Routine Between the Results From These Three Tests

Sponsor: University Hospital Tuebingen

Updated 6 times since 2017 Last updated: Mar 8, 2011 Started: Mar 31, 2011
This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

This observational or N/A phase trial investigates Comparison of Visual Acuity Tests. and ETDRS. FrACT. Landolt Rings. and is currently ongoing. University Hospital Tuebingen leads this study, which shows 6 recorded versions since 2011 — indicating limited longitudinal coverage. The change history captured here reflects the iterative nature of clinical trial conduct.

Status Flow

~Jan 2017 – ~Apr 2018 · 15 months · monthly snapshotUnknown Status~Apr 2018 – ~Jan 2021 · 33 months · monthly snapshotUnknown Status~Jan 2021 – ~Jul 2024 · 42 months · monthly snapshotUnknown Status~Jul 2024 – ~Sep 2024 · 2 months · monthly snapshotUnknown~Sep 2024 – ~Sep 2025 · 12 months · monthly snapshotUnknown~Sep 2025 – present · 10 months · monthly snapshotUnknown

Change History

6 versions recorded
  1. Sep 2025 — Present [monthly]

    Unknown

  2. Sep 2024 — Sep 2025 [monthly]

    Unknown

  3. Jul 2024 — Sep 2024 [monthly]

    Unknown

    Status: Unknown StatusUnknown

  4. Jan 2021 — Jul 2024 [monthly]

    Unknown Status

  5. Apr 2018 — Jan 2021 [monthly]

    Unknown Status

    Phase: NANone

Show 1 earlier version
  1. Jan 2017 — Apr 2018 [monthly]

    Unknown Status NA

    First recorded

Mar 2011

Trial started

Per CT.gov start date — pre-dates our first snapshot

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:
  • University Hospital Tuebingen
  • University of Freiburg
Data source: University Hospital Tuebingen

For direct contact, visit the study record on ClinicalTrials.gov .

Study Locations