Interocular Axial Length Asymmetry and Postoperative Refractive Error After Bilateral Cataract Surgery: A...

Area of Science:

• Ophthalmology
• Refractive Surgery
• Biometry

Background:

• Accurate prediction of postoperative refractive error is crucial for successful cataract surgery outcomes.
• Axial length (AL) is a primary determinant of refractive error, but interocular differences may also play a role.

Purpose of the Study:

• To investigate the association between interocular axial length (AL) asymmetry and postoperative refractive error.
• To determine if AL asymmetry influences refractive outcomes independently of absolute AL measurements.

Main Methods:

• Retrospective comparative study of 42 patients (84 eyes) undergoing bilateral cataract surgery.
• Comparison of longer AL eyes versus shorter AL eyes within patients and with AL-matched controls.
• Analysis of postoperative spherical equivalent (SE) against predicted SE using Barrett Universal II and SRK/T formulas, with multivariable regression.

Main Results:

• Longer AL eyes exhibited a significantly greater myopic shift compared to shorter AL eyes and control eyes.
• Interocular AL asymmetry was independently associated with postoperative refractive error.
• Significant differences in mean postoperative refractive error were observed between longer and shorter AL eyes using both prediction formulas.

Conclusions:

• Interocular AL asymmetry is a significant factor associated with postoperative myopic shift after cataract surgery.
• This asymmetry independently impacts refractive outcomes, even after adjusting for axial length and other potential covariates.