2017年第二届曲阜视觉科学会议知识库

PURPOSE: The gold standard of a successful amblyopia treatment is full recovery of visual acuity (VA) in the amblyopic eye, but there has been no systematic study on how the previously amblyopic eye (pAE) behaves in binocular viewing conditions. In this research, we aimed to quantify sensory dominance of the pAE in a variety of perceptual tasks in subjects with treated amblyopia.
METHODS: Sixteen treated amblyopes with similar visual acuity in two eyes participated in this study. Stereoacuity, monocular and binocular contrast sensitivity functions (CSF), binocular phase combination, and pAE dominance in binocular rivalry were measured. Three indices were derived to quantify sensory eye dominance: (1) binocular contrast summation ratio, (2) interocular balance point in binocular phase combination, and (3) percentage of pAE dominance in rivalry.
RESULTS: Stereoacuity and pAE dominance in binocular rivalry in "treated" amblyopia were largely comparable to those of normal subjects. CSF of the pAE remained deficient in high spatial frequencies. The binocular contrast summation ratio is significantly lower than normal standard. The interocular balance point is 34%, indicating that contrast in pAE is only 34% as effective as the same contrast in pFE in binocular phase combination.
CONCLUSIONS: Although VA, stereoacuity, CSF and binocular rivalry at low spatial frequency in treated amblyopes were normal or nearly normal, the pAE remained "lazy" in high frequency domain, binocular contrast summation, and interocular phase combination. Our results suggest that structured monocular and binocular training are necessary to fully recover deficient functions in amblyopia.