Comparison of Toric Intraocular Lens Alignment Using Image-Guided System and Manual Marking Technique

Area of Science:

• Ophthalmology
• Surgical Technology
• Medical Devices

Background:

• Toric intraocular lenses (IOLs) correct astigmatism during cataract surgery.
• Accurate IOL positioning is crucial for effective astigmatism correction.
• Traditional manual marking techniques have been the standard for IOL alignment.

Purpose of the Study:

• To compare the accuracy of the Callisto eye image-guided system against manual marking for toric IOL placement.
• To evaluate the impact of each positioning method on visual outcomes.

Main Methods:

• Eighty patients received toric IOLs, randomized into an image-guided group (Callisto eye) or a manual marking group.
• Preoperative and 3-month postoperative assessments included visual acuity, refraction, and astigmatism.
• Toric IOL alignment was measured by the deviation from the intended axis.

Main Results:

• Preoperative characteristics were similar between the image-guided and manual marking groups.
• No significant differences were observed in uncorrected or corrected distance visual acuity at 3 months.
• The mean deviation from the intended axis was 2.04±1.84 degrees for the Callisto eye group and 3.24±2.64 degrees for the manual marking group, with no significant impact on visual acuity.

Conclusions:

• The Callisto eye image-guided system provides comparable accuracy to manual marking for toric IOL positioning.
• Image-guided systems offer a viable alternative to manual marking, maintaining effective astigmatism correction and visual outcomes.