Comparative Effect of Cylindrical Lenses Verses Spherical Equilient on Contrast Sensitivity

Low Vision Aids Clinical Trial

Official title:

Comparative Effect of Cylindrical Lenses Verses Spherical Equilient on Contrast Sensitivity

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT06407336
• Other study ID #: MSRSW/Batch-Fall22/702
• Status: Active, not recruiting
• Phase: N/A
• Start date: October 1, 2023
• Est. completion date: September 1, 2024

Study information

• Verified date: May 2024
• Source: Superior University
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial 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.

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.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 68
• Est. completion date: September 1, 2024
• Est. primary completion date: March 1, 2024
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 35 Years

Eligibility

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.

Related Conditions & MeSH terms

• Low Vision Aids
• Vision, Low

Intervention

Diagnostic Test:
• Contrast sensitivity
Contrast sensitivity will be assessed by using two different techniques of refraction on is Cylinderical lens and other is Spherical equivalent

Other:
• Refraction
Refraction will be performed and contrast sensitivity will be assessed to assess patient comfort level and compliance.

Locations

Country	Name	City	State
Pakistan	Sehat Medical Complex Hanjarwal	Lahore	Punjab

Sponsors (1)

Lead Sponsor	Collaborator
Superior University

Country where clinical trial is conducted

Pakistan, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Contrast sensitivity	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	12 Months