[4] In 1915 she won the Sarah Berliner Research Fellowship from the American Association of University Women for study at the Mt.
She focused on the effects of radiation on human eyesight including occupational diseases related to illumination, and had a particular interest in the physiological effects of visible and ultraviolet light, infrared light, and X-ray radiation in a variety of organisms and tissue types.
She also continued her research in biophysics, studying the effect of radiation on breast tumors in mice under a grant from the Jane Coffin Childs Memorial Fund.
"[10] After her retirement from the University of Rochester, Clark moved back to Baltimore and lectured on environmental medicine and continued her research.
[2] In 1917, Janet Howell married Dr. Admont Halsey Clark, a professor in Pathology at Johns Hopkins University Medical School, who died in October 1918 at age 30 due to the Spanish influenza epidemic.