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Mary  A. Johnson

Mary A. Johnson Ph.D.

Academic Title: Associate Professor
Primary Appointment: Ophthalmology and Visual Sciences
Additional Title(s): Director, Visual Function/Electrophysiology Laboratory
Location: 419 W. Redwood, Suite 472
Phone: (410) 328-5930
Fax: (410) 328-1178

Personal History:


* University of Delaware, with Distinction BA (Biology and Psychology), 1977

* Johns Hopkins University (Psychology) MA, PhD, 1982

* Johns Hopkins University School of Medicine (Ophthalmology) Fellow, 1982-83

Research Interests:

* Mechanisms of Vision Loss in Retinal and Optic Nerve Ischemia

* Ocular Complications of Diabetes Mellitus

Clinical Speciality:

Visual Electrophysiology and Psychophysics

Lab Techniques and Equipment:

* Electroretinogram (ERG)

* Multifocal Electroretinogram (mfERG)

* Visual Evoked Potential (VEP)

* Electro-oculogram (EOG)

* Scheimpflug Photography

* ICG Angiography


Johnson, M.A., Choy, D.: On the definition of age-related norms for visual function testing. Appl. Optics 26, 1449-1454 (1987).

Johnson, M.A., Marcus, S., Elman, M.J., McPhee, T.J.: Neovascularization in central retinal vein occlusion: Electroretinographic findings. Arch. Ophthalmol. 106, 348-352 (1988).

Johnson, M.A., Drum, B.A., Quigley, H.A., Sanchez, R.M., Dunkelberger, G.R.: Pattern-evoked potentials and optic nerve fiber loss in monocular laser-induced glaucoma. Invest. Ophthalmol. Vis. Sci. 30, 897-907 (1989).

Johnson, M.A., McPhee, T.J.: Electroretinographic findings in iris neovascularization due to acute central retinal vein occlusion. Arch. Ophthalmol. 111: 806-814 (1993).

Johnson, M.A., Hood, D.C.: Rod photoreceptor transduction is affected in central retinal vein occlusion associated with iris neovascularization. J. Opt. Soc. Am. A. 13: 572-576 (1996).

Krauss, G.L., Johnson, M.A., Miller, N.R.: Vigabatrin-associated retinal cone system dysfunction: electroretinogram and ophthalmologic findings. Neurology 50: 1-5 (1998).

Miller, N.R., Johnson, M.A., Paul, S.R., Girkin, C.A., Perry, J.D., Medura, M., Krauss, G.L.: Visual dysfunction in patients receiving vigabatrin for intractable seizures: Clinical and electrophysiologic findings. Neurology 53: 2082-2087 (1999).

Johnson, M.A., Krauss, G.L., Miller, N.R., Medura, M., Paul, S.R.: Visual function loss from vigabatrin: Effect of stopping the drug. Neurology 55: 40-45 (2000).

Kim, S.Y., Johnson, M.A., McLeod, D.S., Alexander, T., Otsuji, T., Steidl, S.M., Hansen, B.C., Lutty, G.A.: Retinopathy in monkeys with spontaneous type 2 diabetes. Invest. Ophthalmol. Vis. Sci. 45:4543 â?" 4553 (2004).

Johnson, M.A., Lutty, G.A., McLeod, D.S., Otsuji, T., Flower, R.W., Sandagar, G., Alexander, T., Steidl, S.M., Hansen, B.C.: Ocular structure and function in a monkey with spontaneous diabetes mellitus. Exp Eye Res 80:37-42 (2005).

Kim, SY, Johnson, MA, McLeod, DS, Alexander, T, Hansen, BC, Lutty, GA: Neutrophils are associated with capillary closure in spontaneously diabetic monkey retinas. Diabetes 54(5):1534-42 (2005).