Motion and form coherence processing in individuals with cerebral visual impairment.

The CVI group was small and heterogeneous, including ages 8 to 31 years, verbal IQ 22 to 148, and causes such as hypoxic-ischemic injury related to prematurity, periventricular leukomalacia, hypoxic-ischemic encephalopathy, seizure disorder, and genetic or metabolic disorders. Participants needed sufficient acuity, intact visual fields in the tested area, and motor ability to use a mouse or point; exclusions included oculomotor apraxia, intraocular pathology other than mild optic atrophy, uncorrected strabismus, and hemianopia or a field deficit in the tested area. The CVI group had lower mean verbal IQ than controls (86.42 versus 110.05), although adjusted analyses suggested no clinically meaningful effect modification. MRI data were available for only 14 CVI participants, and lesion severity was scored semi-quantitatively, so the null association with lesion scores is uncertain. The study measured psychophysical thresholds, not functional movement, daily activities, or treatment response. It was cross-sectional, so it cannot show that motion coherence deficits caused CVI-related difficulties or change over time.

The supplied text does not include an author conflicts of interest statement. The article is listed as supported by non-U.S. government and NIH extramural research funding.

Do not conclude that motion coherence testing explains daily movement problems or can be used for all people with cerebral visual impairment. The study compared 20 carefully selected participants who could use a mouse or point, had adequate acuity and intact tested visual fields, and did not measure functional movement or treatment response.