Objective accommodation measurements in pseudophakic subjects using an autorefractor and an aberrometer

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Accurate measurement of accommodation is crucial for evaluating visual function.
• Pseudophakic subjects with monofocal intraocular lenses (IOLs) provide a model to study accommodation limitations.
• Objective and subjective methods for assessing accommodation have varying degrees of accuracy.

Purpose of the Study:

• To compare objective accommodation measurements using an autorefractor and aberrometer with subjective push-down and defocus tests.
• To assess the reliability and appropriateness of objective measures in phakic and pseudophakic eyes.
• To establish a benchmark for evaluating accommodating IOL performance.

Main Methods:

• Phakic and pseudophakic subjects underwent subjective accommodation testing (push-down and defocus).
• Objective accommodation was measured using the WR-5100K autorefractor and iTrace aberrometer.
• Calibration tests with contact lenses were performed in both subject groups.

Main Results:

• Subjective tests significantly overestimated accommodative amplitude in pseudophakic subjects (3.28-3.64 D).
• Objective measurements showed minimal accommodation in pseudophakes (0.11 D autorefractor, 0.10 D aberrometer).
• Objective measures demonstrated good agreement with calibration data.

Conclusions:

• Subjective accommodation tests are unreliable and overestimate amplitude in pseudophakes.
• Autorefractors and aberrometers provide accurate and reliable objective accommodation measurements.
• Objective accommodation assessment is suitable for evaluating the efficacy of accommodating IOLs.