Ebbinghaus Illusion Distortions in Amblyopia: Impairments of Visual Size Processing and Interocular Integration.

ABSTRACT:

Purpose

The perceived size of an object can be manipulated by its surroundings. In the current study, we wanted to investigate whether amblyopic patients have normal object size perception and how their perception is affected by abnormal interocular interactions.

Methods

Sixteen adult amblyopes and 16 controls participated in this experiment. We measured the Ebbinghaus illusion magnitude with large and small inducers under one binocular, two monocular, and four dichoptic viewing configurations. Exploratory factor analysis was used to extract common structures and underlying mechanisms in different conditions.

Results

The mean Ebbinghaus illusion magnitude in amblyopia was smaller with large inducers (F1,30 = 5.874, P = 0.021) and larger with small inducers (F1,30 = 5.

SUBMITTER: Tan C 

PROVIDER: S-EPMC12468097 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature