[1] She spent a short period of time in both Bryn Mawr's experimental psychology program as well as the Department of Ophthalmology at Harvard Medical School.

[3] Sloan then returned to Baltimore, Maryland to study as a graduate in the physics program at Johns Hopkins University.

[3][6] During her time at Bryn Mawr College, she was mentored by Clarence Ferree and Gertrude Rand as she began her work in ophthalmology.

[7][3] In 1929, her previous professors at Bryn Mawr College, Clarence Ferree and Gertrude Rand, invited her to join the Wilmer Eye Institute at Johns Hopkins University, where she directed the laboratory of physiological optics and ophthalmology until the end of her professional career in 1973.

[3] Sloan contributed greatly to the scientific community, with over a hundred authored and co-authored articles in a number of research areas.

[3][10] In the study, Sloan conducted "comparative determinations of the light minimum"[10] of the investigated eyes, in the process devising a novel method we now term static perimetry.

[9][3] In addition, the tests for impairments in visual function aided the development of diagnosing macropsia, micropsia, and metamorphopsia.

[3] These ten optotypes, according to Sloan, were specifically chosen from capital letters of the alphabet in an article written in 1959, in order to reduce existing inefficiencies present in other visual acuity test charts.

[19] From her development of the Lantern Test to the Sloan Letters, she stands as an important figure in America's history of ophthalmology and vision science.