Total keratometry for toric intraocular lens calculation: comparison from two swept-source optical coherence...

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optical Coherence Tomography

Background:

• Accurate astigmatism prediction is crucial for successful toric intraocular lens (IOL) implantation.
• Swept-source optical coherence tomography (SS-OCT) devices offer advanced methods for measuring total corneal astigmatism (TCA).
• Comparing different SS-OCT devices for toric IOL calculations is essential for clinical practice.

Purpose of the Study:

• To compare the astigmatism prediction accuracy of total keratometry (TK) from the IOLMaster 700 and total corneal power (TCP) from Anterion.
• To evaluate the performance of these devices in toric IOL calculations using Z CALC 2.0 software.

Main Methods:

• A retrospective observational study included 56 eyes undergoing toric IOL implantation.
• Total corneal astigmatism was measured using both IOLMaster 700 (TK) and Anterion (TCP).
• Postoperative refractive astigmatism prediction errors were analyzed using vector analysis (Holladay method).

Main Results:

• No statistically significant difference was found in the mean vector prediction error between TK (0.48D) and TCP (0.46D).
• Both devices showed similar percentages of eyes within specific prediction error intervals (≤0.25D and ≤0.5D).
• Centroid prediction errors and component differences were comparable between the two devices.

Conclusions:

• The IOLMaster 700 and Anterion provide comparable astigmatic predictability for toric IOL calculations.
• Both SS-OCT devices, when used with Z CALC 2.0, are suitable for toric IOL planning.
• These findings support the use of either device for accurate refractive outcomes in astigmatism correction surgery.