Links between central visual field loss and movement processing during walking.

The samples were small: 29 people with central vision loss and 29 controls in the first study, and 10 and 10 in the second. Many comparisons were run on these small groups, so some of the associations reported could be chance findings. The group with central vision loss was tested in San Francisco and the control group in London, by different researchers in different settings, so anything that differed between the two sites is mixed in with the difference between having and not having central vision loss. Everyone had to be able to walk independently to take part, so the results say nothing about patients who need help to walk or who use a wheelchair. Nobody was treated or followed up, so the study can only show that things occurred together in the same person. It cannot show that vision loss caused the changes in walking, or that changing these thoughts would change walking. How much people consciously think about their walking was measured by asking them. People may not report accurately how automatic or deliberate their movement is. Contrast sensitivity could not be measured in one participant with central vision loss in the second study.

The article text supplied does not include the paper's funding or conflict-of-interest declarations, so it is not possible to say from this text who paid for the work or what the authors declared. The article is indexed as receiving extramural research support from the National Institutes of Health.

Do not read this as proof that central vision loss makes people walk more cautiously by paying extra attention to their movements. They reported the same level of attention to walking as sighted people of the same age, and those with the worst contrast sensitivity reported the least, not the most. Nor do the links between slower walking and worry show cause and effect, since both were measured at a single time point in small samples.