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

NCT07001124 | Active Not Recruiting DMC

• 1 other identifier: MSRSW/Batch-Fall23/821
• Study Type: interventional
• Target: 33
• Locations: 1 country
• Sites: 1

Brief 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

Outcome Measures

Primary Outcomes (3)

• Visual Function Index (VF-14) Questionnaire:

  Scores on all activities that the person performed or did not perform because of vision were then averaged, yielding a value from 0 to 4. This value was multiplied by 25, giving a final score from 0 to 100. A score of 100 indicates able to do all applicable activities score of 0 indicates unable to do all applicable activities because of vision

  12 Months

• +1 blur test

  Adding a +1.00 diopter (DS) lens to a patient's final refraction and measuring their distance visual acuity (VA). There are 4 questions with 5 different options ranging from 0-4. minimum score is 0 and maximum score is 16 with spherical correction.

  12 Months

• Duochrome Test

  A duochrome test chart .There are 4 questions with 5 different options ranging from 0-4. minimum score is 0 and maximum score is 16 with spherical correction.

  12 Months

Study Arms (2)

duochrome test and +1 blur test (Group1) 18-35

EXPERIMENTAL

Diagnostic Test: duochrome test and +1 blur test

duochrome test and +1 blur test (Group1) 36-60

ACTIVE COMPARATOR

Diagnostic Test: duochrome test and +1 blur test

Interventions

duochrome test and +1 blur test DIAGNOSTIC_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.

duochrome test and +1 blur test (Group1) 18-35; duochrome test and +1 blur test (Group1) 36-60

Eligibility Criteria

• Age: 18 Years - 60 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• Age between 18 to 60 years old.
• Both genders.
• Those who have refractive error.
• Patients with no history of prior eye surgery.
• No active eye diseases affecting visual acuity, such as cataracts or retinal disorders.
• Ability to cooperate with both the duochrome test and +1 blur test.

You may not qualify if:

• Patients with severe visual impairment or neurological conditions affecting vision.
• Patients with nystagmus or conditions that could interfere with reliable testing.
• Age below 18 year and above 60 year excluded
• Those patients who don't show their consent.

Sponsors & Collaborators

• Superior University: lead

Study Sites (1)

Eye professionals clinic (14-S DHA Phase 2 Ghazi road)

Lahore, Punjab Province, Pakistan

Location

MeSH Terms

Conditions

Refractive Errors

Condition Hierarchy (Ancestors)

Eye Diseases

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Principal Investigator

Study Record Dates

• First Submitted: May 23, 2025
• First Posted: June 3, 2025
• Study Start: March 1, 2025
• Primary Completion: August 1, 2025
• Study Completion: February 28, 2026
• Last Updated: July 16, 2025

Record last verified: 2025-07

Data Sharing

• IPD Sharing: Will not share

Locations

PA (1)