NCT07001124

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

• Status: Active Not Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 33 (actual)
• Sponsor: Superior University · Academic / Other
• Sex: All
• Age: 18 Years – 60 Years
• Healthy volunteers: Not accepted

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.

Detailed description

This study aims to evaluate the efficacy, accuracy, and reliability of the duochrome test in identifying refractive errors, including myopia and hyperopia across various ages. Refractive errors, including myopia, hyperopia, and astigmatism, are leading causes of visual impairment, requiring precise diagnostic tools. The duochrome test utilizes chromatic aberration to refine prescriptions, whereas the +1 blur test assesses spherical correction accuracy. Despite their clinical use, direct comparative studies remain limited. A total of 33 participants with estimated 10% dropout randomly assigned to undergo both tests. Groups will be based on different ages, Group A (18-35 years)and group B (36-60 years) ..both test (Duochrome test and +1 blur test) will apply on every patients.

Conditions

• Refractive Errors

Interventions

Type	Name	Description
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.

Timeline

• Start date: 2025-03-01
• Primary completion: 2025-08-01
• Completion: 2026-02-28
• First posted: 2025-06-03
• Last updated: 2025-07-16

Locations

1 site across 1 country: Pakistan