Director:

Dr. Randy Hammond

The primary goal of our research program is to conduct basic and applied studies on the visual system. A primary focus of the laboratory has been the study of the dietary carotenoids lutein and zeaxanthin, concentrated within the fovea (termed macular pigment or the macula lutea) and brain.  These studies have ranged across populations, infants to elderly, normal to diseased, and techniques, from pyschophysics to neuroimaging.

Researchers involved in the UGA Vision Laboratory:

B. Randy Hammond, Jr. PhD - Principal Investigator
Lisa Renzi, PhD - C0-invesitgator
Laura Fletcher- Graduate Student
Sarah Thorne- Graduate Student
Kevin OBrien- Graduate Student

Selected Publications:

Hammond, B.R., Fletcher, L. and Elliott, J. (2013) Glare disability, photostress recovery, and chromatic contrast: relation to serum and retinal lutein and zeaxanthin.  Investigative Ophthalmology and Visual Science.  54(1), 476-81.

Renzi, L., Bovier. E and Hammond, B.R. (2013).  A role for the macular carotenoids in visual motor response.  Nutritional Neuroscience. 16(6), 262-268.

Bovier, E. R., Lewis, R. D., and  Hammond, B. R. (2013). The Relationship between Lutein and Zeaxanthin Status and Body Fat.   Nutrients, 5(3), 750-757.

Hammond, B.R. and Renzi, L. (2013).  Carotenoids.  Advances in Nutrition, 4, 474-76.

Renzi, L.M., Dengler, M.J., Puente, A., Miller, L.S. and Hammond, B.R.  (2014) Relations  between macular pigment optical density and cognitive function in unimpaired and mildly cognitively impaired older adults.  Neurobiology of Aging, 35(7), 1695-1699.

Wong, J., Kaplan, H. and Hammond, B.R. (2014).   Lutein and Zeaxanthin Status and         Auditory Thresholds in a Sample of Young Healthy Adults. Nutritional Neuroscience.

Fletcher, L., Engles, M. and Hammond, B.R. (2014) Visibility through Atmospheric Haze and  its Relation to Macular Pigment. Optometry and Vision Science.91(9), 1089-96..

Bovier, E.R., Renzi, L. and Hammond, B.R. (2014). A double-blind, placebo-controlled      study on the effects of lutein and zeaxanthin on neural processing speed and        efficiency. PLoS ONE 9(9): e108178. doi:10.1371/journal.pone.0108178.

Hammond, B.R., Johnson, B.A., George, ER. (2014).  Oxidative photodegradation of        ocular tissues: beneficial effects of filtering and exogenous antioxidants.     Experimental Eye Research, 129, 135-50.

Bovier, ER and Hammond, B.R. A randomized placebo-controlled study on the effects of lutein and zeaxanthin on visual processing speed in young healthy subjects. Archives of Biochemistry and Biophysics.

Hammond, B.R., Fletcher, L., Roos, F., Wittwer, J. and Schalch, W. (2014) A double-blind, placebo-controlled study on the  effects of lutein and zeaxanthin on  photostress recovery, glare disability and chromatic contrast.  Investigative Ophthalmology and        Visual Science, 55, 8583-89.

Hammond, BR. (2014).   Lutein and Cognition in Children.  Journal of Nutritional  Science,  e54, 1-2.

Hammond, B.R. (2015).   Attenuating glare disability and photostress in pseudophakes through the addition of a short-wave absorbing filter.  Journal of Ophthalmology, 215,  1-8.