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Comparative Efficacy of Duochrome Test Verse +1 Blur Test in Detecting Refracting Error Across Different Ages

NCT07001124 · Status: ACTIVE_NOT_RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 33

Last updated 2025-07-16

No results posted yet for this study

Summary

The comparative efficacy of the duochrome test versus +1 blur test in detecting refractive errors across different ages remains under-explored in current ophthalmic research. While the duochrome test is widely used to refine prescriptions, its standalone effectiveness compared to +1 blur test based refraction has not been thoroughly investigated.

Conditions

  • Refractive Errors

Interventions

DIAGNOSTIC_TEST

duochrome test and +1 blur test

The participant is seated at a standard testing distance (typically 6 meters or 20 feet). A duochrome chart with black letters on a split red-green background is presented. After determining the subjective refraction, a +1.00 diopter (DS) lens is added to the final prescription. The participant is asked to read the distance visual acuity (VA) chart. The expectation is that the visual acuity should drop to 4 lines on Snellen chart (6/24) when the +1.00 DS lens is added. If VA reduces to 6/24: Indicates that the refraction is not over-minused or over-plussed (proper end point of refraction). If VA remains better than 6/24: Suggests the patient was still accommodating, possibly leading to over-minus (in myopes) or under-plus (in hyperopes) and the refraction should be re-evaluated.

Sponsors & Collaborators

  • Superior University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
HEALTH_SERVICES_RESEARCH
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
60 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-03-01
Primary Completion
2025-08-01
Completion
2026-02-28

Countries

  • Pakistan

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07001124 on ClinicalTrials.gov