Abstract Introduction Pediatric patients undergoing stem cell transplant (SCT) often experience extended hospitalizations. Inappropriate lighting during admissions is known to disrupt sleep and circadian health, which can result in worse health outcomes. This study aimed describe patterns of light across 24-hour periods two inpatient rooms children SCT. Methods Wall-mounted meters (Extech SDL40...

PURPOSE In this study, the hypothesis that near-infrared (NIR) light treatment (photobiomodulation) attenuates bright-light damage in the albino rat retina was tested. METHODS Young adult Sprague-Dawley (SD) albino rats were raised in dim (5 lux), cyclic light and then exposed to bright (1000 lux), continuous light for 24 hours. The animals were treated with 670-nm light (9 J/cm(2)) in an LED...

An increase in the degree of light adaptation causes a decrease in the slope of the subsequent rod dark adaptation function and a displacement of the function to the right on the time axis. Over a wide range, these changes occur to the same extent whether the increase in the degree of light adaptation is produced by raising the intensity or by prolonging the exposure. Within these limits, the B...

BACKGROUND Low levels of light exposure at critical times are thought to cause seasonal affective disorder. Investigators, in studies demonstrating the usefulness of bright light therapy, also have implicated light's role in non-seasonal depression. The precise cause of postpartum depression has not been delineated, but it seemed possible that new mothers would spend reduced time in daylight. T...