NCT06753032

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

• Status: Active Not Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 36 (actual)
• Sponsor: Superior University · Academic / Other
• Sex: All
• Age: 18 Years – 50 Years
• Healthy volunteers: Accepted

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.

Detailed 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.

Conditions

• Myopia

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Positive Lens-Induced Defocus Using Spectacle Lenses (+2.00 D) for Myopic Participants	Intervention Description: This group will be exposed to positive defocus induced by +2.00 D spectacle lenses. The lenses are designed to create optical blur to evaluate the effects on contrast sensitivity and visual fatigue. Measurements will be conducted at baseline, 2 weeks, and 4 weeks after exposure to assess changes in visual function."
DIAGNOSTIC_TEST	Negative Lens-Induced Defocus Using Spectacle Lenses (-2.00 D) for Myopic Participants	Intervention Description: This group will be exposed to negative defocus induced by -2.00 D spectacle lenses. The induced defocus will allow for the evaluation of its impact on contrast sensitivity and visual fatigue. Assessments will be carried out at baseline, 2 weeks, and 4 weeks."
COMBINATION_PRODUCT	Positive Lens-Induced Defocus Using Spectacle Lenses (+2.00 D) for Non-Myopic Participants	ntervention Description: This group will undergo positive defocus using +2.00 D spectacle lenses. The intervention aims to examine the effect of induced defocus on contrast sensitivity and visual fatigue in non-myopic participants. Data will be collected at baseline, 2 weeks, and 4 weeks."
COMBINATION_PRODUCT	Negative Lens-Induced Defocus Using Spectacle Lenses (-2.00 D) for Non-Myopic Participants	Intervention Description: This group will experience negative defocus induced by -2.00 D spectacle lenses. The purpose is to evaluate how negative lens-induced defocus affects contrast sensitivity and visual fatigue in non-myopic participants. Measurements will be taken at baseline, 2 weeks, and 4 weeks.

Timeline

• Start date: 2024-02-28
• Primary completion: 2024-07-31
• Completion: 2025-03-01
• First posted: 2024-12-31
• Last updated: 2024-12-31

Locations

1 site across 1 country: Pakistan