Dr. Koenig joined the faculty at ICO in 2018. He assists in 1st and 2nd year clinical methods and procedures labs and optics courses. Dr. Koenig developed an interest in teaching at an optometric institution after initially overseeing 4th year students on rotation in San Antonio, Texas. ICO is an ideal location and provides an exciting and rewarding opportunity to pursue my interest in teaching the skills and ideas of optometry to newer generations of students.

Special Interests

Geometric, physical and visual optics, vision quality and visual optics in aging, optical and neurological limits to visual function, primary care optometry and ocular disease

Education

OD – Nova Southeastern University College of Optometry
PhD – University of Houston College of Optometry – Physiological Optics and Vision Science

Experience

MCPHS University School of Optometry
University of Houston College of Optometry
Brook Army Medical Center
Lackland Air Force Base

Awards & Honors

Bausch + Lomb Ezell Fellow
Ruth L. Kirschstein National Research Service Award
National Eye Institute/ARVO Travel Grant
Minnie F. Turner Memorial Fund for Impaired Vision Research Award
Beta Sigma Kappa Optometric Honor Society

Professional Organizations

Past and Present Memberships:
American Academy of Optometry (Fellow)
American Optometric Association
Optical Society of America
Association for Research in Vision and Ophthalmology
American Association for the Advancement of Science

Publications

Peer Reviewed Publications:

Applegate RA, Donnelly WJ, Marsack JD, Koenig DE, Pesudovs K: Three-Dimensional Relationship Between High-Order Root-Mean-Square Wavefront Error, Pupil Diameter, and Aging. J Opt Soc Am – A, 24(3): pages 578-587, 2007.

Koenig DE, Applegate RA, Marsack JD, Sarver EJ, Nguyen LC: Detecting Significant Change in Wavefront Error: How Long Does it Take? Clin Exp Optom, 92(3):246-252, 2009.

Koenig DE, Hofer HJ: The absolute threshold of cone vision. Journal of Vision, 11(1):21, 1-24, 2011.

Koenig DE, Hofer HJ: Do color appearance judgments interfere with detection of small threshold stimuli? J Opt Soc Am, 29(2):A258-A267, 2012.

Hofer HJ, Blaschke J, Patolia J, Koenig DE: Fixation light hue bias revisited: implications for using adaptive optics to study color vision. Vis Res, 56: 49-56, 2012.

Koenig DE, Nguyen LC, Parker KE, Applegate RA (2013). Factors accounting for 4 year acuity change in patients 50 to 80 years old. Optometry and Vision Science, 90(7):620-627.

Koenig DE, Hart NW, Hofer HJ (2014). Adaptive optics without altering visual perception. Vision Research, 97:100-107.

Marsack JD, Ravikumar A, Nguyen LC, Ticak A, Koenig DE, Elswick JD, Applegate RA (2014). Wavefront-guided scleral lens correction in keratoconus, Optometry and Vision Science, 91(10):1221-1230.

Ticak A, Marsack JD, Koenig DE, Ravikumar A, Shi Y, Nguyen LC, Applegate RA (2015). A comparison of three methods to increase scleral contact lens on-eye stability, Eye Contact Lens, 41(6):386-390.

Posters and Platform Presentations:

Koenig DE, Hofer HJ (2007). The Absolute Threshold of Cone Vision is Relatively Insensitive to the Criteria for Seeing. Poster presented at the Optical Society of America – Fall Vision Meeting, Berkeley, California.

Koenig DE, Applegate RA (2007). Metrics Reduced to Best Subsets to Predict Visual Performance. Poster presented at the annual meeting of the American Academy of Optometry, Tampa, Florida.

Koenig DE, Hofer HJ (2008). Test of the Threshold-Criterion Relationship in Cone Vision Indicates an Internal, Fixed Threshold. Poster presentation at the annual meeting of the Houston Society for Engineering in Medicine and Biology, Houston, Texas.

Applegate RA, Thibos LN, Marsack JD, Queener HM, Koenig DE (2008) Change in retinal image quality for physiologic pupil diameters does not account for the loss of logMAR acuity with age. Invest. Ophth. Vis. Sci. 49: E-Abstract 2840.

Koenig DE, Hofer HJ (2009). What Determines the Absolute Threshold of Cone Vision? Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida.

Applegate RA, Koenig DE, Marsack JD, Sarver EJ, Nguyen LC (2009) Pupil center location uncertainty is a major source of noise in WFE measurements. Invest. Ophth. Vis. Sci. (ARVO).

Koenig DE, Hofer HJ (2010). Dark Adapted Foveal Detection Thresholds and Spatial Pooling. Paper presentation at the annual meeting of the Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida.

Hofer HJ, Blaschke J, Patolia J, & Koenig DE (2010). Fixation light hue bias and adaptive optics psychophysics: does the wavefront sensor beacon alter color appearance? Poster presentation at the annual meeting of the Association for Research in Vision and Ophthalmology.

Koenig DE, Hofer HJ (2010). Simultaneous measurements of detection thresholds and color appearance: Does attending to color appearance impact detection? Poster presented at the Optical Society of America – Fall Vision Meeting, Rochester, New York.

Koenig DE, Hofer HJ (2011). Does reporting color facilitate detection in a threshold-level, dual-judgment task? Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmalogy, Fort Lauderdale, Florida.

Koenig DE, Hofer HJ (2011). Can subjects tailor their detection strategy to match expected stimulus size at absolute cone threshold? Poster presented at the Optical Society of America – Fall Vision Meeting, Seattle, Washington.

Koenig DE, Hofer HJ (2012). Spatial integration in the dark-adapted fovea. Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida.

Hart NW, Koenig DE, Hofer HJ (2012). Adaptive optics without altering visual perception. Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmology, Fort Lauderdale, Florida.

Ravikumar A, Koenig DE, Applegate RA (AAO poster abstract 2012). Does abrupt change in image quality impact acuity in a similar manner as a function of age?

Kellogg A, Koenig DE, Hofer HJ (AAO poster abstract 2012). Is there a universal in-focus wavelength for aberration based subjective refractions?

Marsack JD, Nguyen LC, Koenig DK, Ticak A, Elswick J, Applegate RA (2013). Visual performance and residual aberration in keratoconus subjects wearing custom scleral contact lenses. Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmology, Seattle, Washington.

Hofer HJ, Koenig DE (2013). Two-point detection and appearance in the absence of higher order aberrations. Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmology, Seattle, Washington.

Koenig DE, Hofer, HJ (2013). Is dark-adapted cone detection optimized given noise and uncertainty? Poster presented at the annual meeting of the Association for Research in Vision and Ophthalmology, Seattle, Washington.

Koenig DE, Ravikumar A, Hofer, HJ (2013). Two-point detection, discrimination, and appearance without higher order aberrations in the dark-adapted fovea. Contributed paper presentation for the Optical Society of America’s Fall Vision Meeting, Houston, Texas October 2013.