Accuracy evaluation of objective refraction using the wavefront aberrometer in pseudophakic eyes

Area of Science:

• Ophthalmology
• Optometry
• Optical Engineering

Background:

• Cataract surgery with intraocular lens (IOL) implantation is a common procedure.
• Accurate refractive outcomes are crucial for patient satisfaction after cataract surgery.
• Objective refraction methods are being developed to complement or replace subjective manifest refraction (MR).

Purpose of the Study:

• To assess the precision of wavefront-derived objective refraction in eyes with existing intraocular lenses (pseudophakic eyes).
• To compare objective refraction measurements with traditional manifest refraction (MR).
• To investigate the influence of axial length (AL) and keratometry on objective refraction accuracy.

Main Methods:

• A retrospective analysis of 356 eyes (356 patients) that underwent phacoemulsification and IOL implantation.
• Comparison of noncycloplegic manifest refraction (MR) with wavefront aberrometer objective refraction data.
• Subgroup analysis of objective refraction at a 2.6-mm zone, stratified by AL and average keratometry.

Main Results:

• Objective refraction showed statistically significant differences from MR for sphere, spherical equivalent (SE), and J0 at various zones (2.6, 3, and 4 mm), but not for J45.
• The 2.6-mm zone provided the highest accuracy for SE in short eyes (AL ≤ 22.5 mm), with minimal bias (-0.15 ± 0.28 D).
• No significant differences in accuracy were observed between keratometry subgroups.

Conclusions:

• The wavefront aberrometer demonstrates optimal accuracy at the 2.6-mm zone in pseudophakic eyes with short AL.
• Current wavefront technology requires further refinement to be a reliable substitute for manifest refraction in this patient population.