In addition to general ophthalmology, Dr. Greer's areas of interest have included:
Effects of solar ultraviolet on the eye -- presented in-the-field dosimetry of tropical solar UV reaching eyelids at the American Society of Photobiology, Edward Harkness Eye Institute, and other academic forums;
The use of lasers in general ophthalmic practice -- was an early adopter of lasers in comprehensive ophthalmology;
corneal transplantation - instructed corneal transplantation at the DC VA Hospital for ten years; and
Other areas of interest: Glaucoma; Glaucoma patient education; benefits/risks of LASIK; eye allergies; and intracellular magnesium deficiency.