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.

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.

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.