Aniseikonia Tests: A Review of Current Measurement Methods.

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Aniseikonia, a disparity in perceived ocular image size or shape, significantly impairs binocular vision and stereopsis.
• Accurate aniseikonia testing is vital for diagnosing visual dysfunction and guiding treatment prognosis.

Purpose of the Study:

• To review advancements in aniseikonia testing methodologies.
• To evaluate the clinical utility and identify limitations of current aniseikonia assessment tools.

Main Methods:

• A narrative review synthesizing evidence on traditional and digital aniseikonia assessment approaches.
• Analysis of testing principles, psychophysical protocols, and clinical applications.

Main Results:

• Digital innovations like the New Aniseikonia Test (NAT) and Aniseikonia Inspector (AI3) offer enhanced precision over traditional methods.
• Aniseikonia measurements correlate with retinal pathologies and surgical outcomes, aiding in managing conditions like amblyopia and post-retinal surgery.
• Methodological inconsistencies in stimulus types, testing distances, and scoring criteria limit cross-study comparability.

Conclusions:

• Aniseikonia tests are essential clinical tools providing insights into visual dysfunction and treatment outcomes.
• Standardization of test parameters and validation in diverse populations, including pediatric and amblyopic patients, are critical for refining diagnostic thresholds.
• Emerging technologies and consensus guidelines will improve the accessibility, reliability, and practical application of aniseikonia testing, ultimately enhancing patient care.