Reduced visual field may lead to activity decline
Increased visual field damage may lead to decreased levels of physical activity in patients with glaucoma, according to findings published in Ophthalmology.
E. Jian-Yu, MD, MPH, of the department of epidemiology at Johns Hopkins Bloomberg School of Public Health, and colleagues sought patterns of objectively measured physical activity by level of visual field (VF) damage in patients with glaucoma. They included activity fragmentation and diurnal patterns of activity in the measurements.
The researchers evaluated data from a prospective cohort study of older adults diagnosed with glaucoma or suspected glaucoma.
Degree of VF damage was defined by average VF sensitivity within the integrated VF (IVF), Jian-Yu and colleagues wrote. Investigators equipped participants with hip accelerometers for 1 week to measure minute-by-minute activity for 7 consecutive days.
The main outcome was activity fragmentation and amount of activity over the course of the day between 5 a.m. and 11 p.m., the researchers wrote.
Jian-Yu and colleagues found that each 5-unit decibel decrement in IVF sensitivity was associated with 16.3 fewer active minutes per day and 2% greater activity fragmentation (P < .05 for both), but not with the number of active bouts per day.
Lower IVF sensitivity was associated with fewer steps in 3-hour increment groups ranging from 11 a.m. to 2 p.m. and 2 p.m. to 5 p.m. (106.6 fewer steps vs. 93.1; P < .05 for all), the researchers wrote. The 5 p.m. to 8 p.m. period recorded 89.2 fewer steps.
“Given the associations between more fragmented activity and physiological decline, our findings suggest possible physical health consequences in some glaucoma patients, ie, those with more fragmented activity due to severe VF damage,” the researchers wrote.