Dr. LessmannDr. Hans F. Lessmann, Executive Director of VDI, (back center in staff picture below) is a Board Certified Fellow in both Vision and Light therapy by the College of Optometrists in Vision Development ( and the College of Syntonic Optometry ( He has won numerous awards, including being named Pennsylvania’s Optometrist of the Year in 2003. He enjoys solving complex vision and developmental problems for all ages from infancy to late adulthood. Dr. Lessmann is the father of a daughter with Down syndrome and understands the concerns of children with special needs and their parents. Click here to view Dr. Lessmann’s cv.


Our experienced staff consists of skilled professionals who cumulatively have more than 75 years of experience in vision therapy.



al2.3 250x250Amy has been with the practice since 1992. She handles administration and covers the front desk. She also maintains the inventory of the many stylish frames in our optical frame room. Amy understands the value of services at VDI and can address questions from prospective new patients.
dd2.3 250x250Don is the senior staff member, having been a vision therapist in Pittsburgh since 1966. Don is a career high school science teacher, retired; and a continuous associate of Dr. Harry Wachs, O.D. and now of Dr. Hans F. Lessmann, O.D. serving as a therapist and administrative assistant in many capacities. Don is particularly passionate about the science of vision and the cognitive aspects of developmental therapy.
mh1.3 250x250Maria joined the Vision Development Institute in 2009 training under senior therapists and continues her vision therapy education through COVT course work. Uniquely she is a Certified Suzuki Method violin instructor and also adept at homeschooling. She has a daughter who benefited from vision therapy and finds it very rewarding helping patients of all ages obtain their goals through vision therapy.