Evaluating Rotational Stability of an Extended Depth of Focus Toric Intraocular Lens Using a Slit Lamp and...

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optical Engineering

Background:

• Toric intraocular lenses (IOLs) are used to correct astigmatism during cataract surgery.
• Extended depth of focus (EDOF) IOLs aim to provide a wider range of clear vision.
• Rotational stability of toric IOLs is crucial for maintaining astigmatic correction.

Purpose of the Study:

• To evaluate the rotational stability of a specific toric extended depth of focus (EDOF) intraocular lens (IOL).
• To compare slit lamp evaluation with image-processing software for measuring IOL orientation changes.

Main Methods:

• Prospective, unmasked, randomized clinical trial involving 150 eyes.
• Subjects received toric EDOF IOLs (TECNIS Symfony® Toric) in both eyes.
• IOL orientation was measured at 1 day, 1 month, and 3 months post-surgery using slit lamp imaging and image analysis.

Main Results:

• Mean absolute lens orientation changes were less than 2 degrees between 1 day and 3 months post-surgery.
• Over 97% of lenses exhibited rotation of 5 degrees or less.
• Image analysis provided more consistent results than slit lamp measurements.

Conclusions:

• The evaluated toric EDOF IOL demonstrated significant rotational stability, surpassing the ANSI standard.
• Image analysis is the preferred method for assessing IOL orientation changes.
• This toric EDOF IOL offers reliable astigmatism correction post-cataract surgery.