Comparative Effect of Cylindrical Lenses Verses Spherical Equilient on Contrast Sensitivity

Not Applicable

Active, not recruiting

• Conditions: Low Vision Aids
• Interventions: Diagnostic Test: Contrast sensitivity; Other: Refraction

• Registration Number: NCT06407336
• Lead Sponsor: Superior University

Brief Summary

the concept of spherical equivalent plays a pivotal role in simplifying the prescription and enhancing communication between eye care professionals and patients. The spherical equivalent is a calculated value that condenses the spherical and cylindrical components into a single power.

Detailed Description

Mathematically, it is determined by adding half of the cylindrical power to the spherical power (SE = Sphere + (Cylinder/2)). This calculated value serves as a convenient representation of the overall refractive error, aiding in a more straightforward understanding of the prescription. Understanding their individual and collective impact on contrast sensitivity opens up new avenues for refining corrective interventions and enhancing the overall quality of vision. This article aims to demystify the intricate relationship between spherical equivalent and cylindrical correction, and their collective impact on contrast sensitivity.

Study Timeline

• Study Start: 2023-10-01
• Primary Completion: 2024-03-01
• Status Verified: 2024-05
• Study First Submitted: 2024-05-02
• Study First Submitted QC: 2024-05-06
• Last Update Submitted: 2024-05-06
• Study First Posted: 2024-05-09
• Last Update Posted: 2024-05-09
• Study Completion: 2024-09-01

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 68

Inclusion Criteria

• Patients within 18 to 35 years will be included.
• Both genders will be included.
• Patients having astigmatism will be included.
• Patients having 6/6 corrected vision will be included.
• Eyes having no other ocular pathology will be included.
• Patients having no history of ocular surgery or corneal scar will be included.

Exclusion Criteria

• i. Eyes having any ocular pathology will be excluded.
• Patients with corneal suture will be excluded.
• Those using contact lenses instead of spectacles for vision correction will be excluded.
• Participants with a history of eye surgery within the past year will be excluded.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Contrast sensitivity	Contrast sensitivity	-
Refraction	Refraction	-

Primary Outcome Measures

Name	Time	Method
Contrast sensitivity	12 Months	The ability to perceive sharp and clear outlines of very small objects. It is also defined as the ability to identify minute differences in the shadings and patterns. CS helps detect objects without a clear outline and distinguish them from their background contrast

Trial Locations

Locations (1)

Sehat Medical Complex Hanjarwal; 🇵🇰 Lahore, Punjab, Pakistan