Which factor is NOT a recognized cause of visual impairment?

Extensive travel is not recognized as a factor that causes visual impairment. Visual impairment typically results from physiological or developmental conditions rather than behaviors or activities such as travel. Cerebral palsy, along with various diseases and birth defects, can lead to changes in vision due to neurological or structural issues inherent in those conditions. In contrast, extensive travel may expose individuals to different environments but does not inherently affect visual function. Understanding this distinction helps clarify the contexts in which visual impairments arise and ensures appropriate support strategies can be implemented for those affected.