Impact of Positive & Negative Lens-Induced Defocus on Contrast-Sensitivity in Myopic & Non-Myopic Adults

Last updated: December 22, 2024
Sponsor: Superior University
Overall Status: Active - Not Recruiting

Phase

N/A

Condition

Allergies & Asthma

Allergy

Myopia

Treatment

Positive Lens-Induced Defocus Using Spectacle Lenses (+2.00 D) for Myopic Participants

Negative Lens-Induced Defocus Using Spectacle Lenses (-2.00 D) for Myopic Participants

Negative Lens-Induced Defocus Using Spectacle Lenses (-2.00 D) for Non-Myopic Participants

Clinical Study ID

NCT06753032
MSRSW/Batch-Fall22/750
  • Ages 18-50
  • All Genders
  • Accepts Healthy Volunteers

Study Summary

examines the influence of lens-induced defocus on contrast sensitivity-a crucial aspect of visual performance.Each participant experiences both positive and negative defocus through different lenses, with measurements taken for contrast sensitivity using the Pelli-Robson chart. Outcomes are evaluated at baseline, 2 weeks, and 4 weeks to understand the effect of defocus over time.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Adults aged 18 to 50 years.

  • Participants with a confirmed diagnosis of myopia or non-myopia.

  • Best corrected visual acuity of 20/30 or better.

  • No history of ocular surgery or significant ocular disease.

  • Informed consent was obtained.

Exclusion

Exclusion Criteria:

  • Individuals with a history of systemic diseases affecting vision (e.g., diabetes,hypertension).

  • Presence of binocular vision anomalies or strabismus.

  • Pregnant or nursing women.

  • Any current use of medications affecting visual function (e.g., medications causingvisual side effects).

Study Design

Total Participants: 36
Treatment Group(s): 4
Primary Treatment: Positive Lens-Induced Defocus Using Spectacle Lenses (+2.00 D) for Myopic Participants
Phase:
Study Start date:
February 28, 2024
Estimated Completion Date:
March 01, 2025

Study Description

Additional data on symptoms like visual fatigue and computer vision syndrome are gathered using the Visual Fatigue Questionnaire (VFQ) and the Computer Vision Syndrome Questionnaire (CVS-Q), respectively. This study's findings could be instrumental in refining optical treatments, offering insights into how defocus impacts visual function across refractive conditions. Results may ultimately benefit optometric practices by guiding lens prescriptions for improved contrast sensitivity and quality of life for myopic and non-myopic individuals alike.

Connect with a study center

  • Tehsil Headquarters (THQ)

    Taunsa, Punjab
    Pakistan

    Site Not Available

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