The doctors and staff at the Vision & Conceptual Development Center (VCDC) are dedicated to giving our patients relief from visual development disorders, vision defects and challenges. We are passionate about helping children and adults with complex, hard-to-diagnose vision problems who need specialized care.


Your VCDC Eye Doctors

Amanda R. Zeller Manley, OD, FCOVDAmanda R. Zeller Manley, OD, FCOVD
Developmental Optometrist

Board-CertifiedCollege of Optometrists in Vision Development
ODNova Southeastern University, Ft. Lauderdale, FL
BScMicrobiology & Cell Science, University of Florida, Gainesville, FL

Dr. Amanda Zeller Manley specializes in Neuro-Optometric Vision Rehabilitation, binocular vision disorders, brain injury vision rehabilitation, visuo-spatial disorders (vision-related learning problems) and special-needs vision care for children and adults. Dr. Zeller is board certified in Vision Therapy and Vision Development, and is a Diplomate of the American Board of Optometry.

Along with associate Dr. Green, she has extensive experience treating children with autism spectrum disorders and other special populations. Their approach to visuo-cognitive therapy goes far beyond most vision therapy practices, being focused on the development of the visual-spatial basis for learning. Dr. Zeller enjoys spending time outside the office with her husband and children.

Dr. Zeller is available for in-services for schools and other organizations.


  • Neuro-Optometric Rehabilitation Association (NORA),
  • College of Optometrists in Vision Development (COVD),
  • Optometric Society of the District of Columbia,
  • Maryland Optometric Association,
  • American Optometric Association,
  • Optometric Extension Program Foundation,
  • Institute of Behavioral Optometry,
  • Special Olympics (vision screening volunteer),
  • Volunteer Optometric Services to Humanity (VOSH),
  • Women Business Owners of Montgomery County


Mehrnaz D. Azimi Green, OD, FCOVDMehrnaz D. Azimi Green, OD, FCOVD
Developmental Optometrist

Board-Certified: College of Optometrists in Vision Development
OD: Nova Southeastern University, Ft. Lauderdale, FL
BABiology, St. Mary’s College of Maryland, St. Mary’s City, MD

Dr. Mehrnaz Azimi Green’s expertise lies with diagnosing and treating patients to develop their visual and cognitive knowledge. She enjoys working with children, including infants and toddlers, with special needs.  Dr. Green is also involved in the rehabilitation of brain injured patients; these patients often suffer from vision related neurological and cognitive challenges. 

Dr. Green has extensive training in working with children with developmental delays, including autism.  She is a DIR-FCD Certified Profectum Professional in Developmental Optometry and Intermediate DIR(R) Floortime(tm) provider. 

Dr. Green enjoys speaking to parents and professionals about visuo-cognitive therapy and has lectured at multiple schools, conferences and symposia. She works with occupational, physical, and speech-language therapists, psychologists, educators, and parents to help them understand the relationship between vision and learning, and how vision therapy can help patients succeed.

Dr. Green also volunteers with the Special Olympics and at multiple area schools. She has received several national awards for her skills and knowledge in vision therapy and has published original articles in those subjects.  When she’s not working, Dr. Green spends her time with her husband and two young daughters.


  • College of Optometrists in Vision Development,
  • Optometric Extension Program Foundation,
  • Neuro-Optometric Rehabilitation Association,
  • Institute of Behavioral Optometry,
  • American Optometric Association,
  • Maryland Optometric Association,
  • Interdisciplinary Council of Developmental & Learning Disorders,
  • Profectum,
  • The Minds in Motion Academy Advisory Board, Special Olympics

Your VCDC Therapists 

Matt Hiller, COVT - Chevy Chase, MDMatt Hiller, COVT
Certified Optometric Vision Therapist

Membership: College of Optometrists in Vision Development (COVD)
Degree: BSc Psychology, Radford University, Radford, VA
Interests: Martial Arts, Chess, and Magician

“When I was in third grade, I was helped by a developmental optometrist and became interested in the field. Today, I enjoy the one-on-one interaction with patients and find very rewarding the personal achievements patients are making during therapy. I am extremely caring, with a great sense of wonder and a strong desire to make learning fun.” 


Kate Kinsey, COVT - Chevy Chase, MD

Kate Kinsey, COVT
Certified Optometric Vision Therapist

Membership: College of Optometrists in Vision Development (COVD)
Degree: BA Psychology, George Mason University, Fairfax, VA
Interests: Sports, Traveling, Cuisine, & Learning French

“I have always wanted to go into the healthcare industry because I love helping people. Vision impacts so many aspects of our daily lives and even small struggles in this area can be great stressors when completing everyday tasks. Helping patients accomplish their goals can greatly improve their self-esteem, academic efforts, occupational goals and overall quality of life. The excitement my patients express as they notice progress due to strides in our vision therapy program makes my job worthwhile.”

Ben Mazur
Optometric Vision Therapist

Degree: BA Psychology, American University, Washington, D.C.
Interests: Science & Trivia

"I enjoy working with people and helping them grow. I like being able to share in the joy when a patient is able to do something that was previously impossible. Vision Therapy is also the only field I know of that lets me combine my experience with people on the Autism Spectrum, with my love of physics. The most rewarding part of my job is knowing I’ve made a difference in someone else’s life."

Stephen Yednock
Optometric Vision Therapist

Degree: BA Secondary Education, University of Maryland, College Park, MD
Interests: Theater & Movies

"Having a background in special education, I find it fascinating and rewarding to see patients improve from session to session and to see the impact on both their vision and daily life. I enjoy approaching each session with enthusiasm and the aim of making therapy a pleasant experience." 


Swithin David
Optometric Vision Therapist

Certifications: Primitive Infantile Reflex Remediation & Z-Bell Screening
Degree: BSc Brain & Cognitive Sciences, University of Rochester, Rochester, NY
Interests: Improvisational Comedy & Personal Finance 

"I never let school interfere with my education." -Mark Twain




Your VCDC Administrators 

Alastair Firby                     
Patient Care Coordinator

Martha David
Front Desk Liason

Alastair and Martha will be happy to provide assistance in guiding you and your family through the process of scheduling your evaluation and vision therapy, making sure all of your non-clinical needs are met.



Our Founder 

Harry WachsThe Vision & Conceptual Development Center (VCDC) was founded as a private practice in 1996 by the late Harry Wachs. Previously, he had created a successful optometry practice in Pittsburgh, and reading centers in both Catholic University of America, and George Washington University. He designed the foremost home vision training kit that is used by many vision therapy offices today. His influence still persists through his published articles, and the books Thinking Goes to School and Visual/Spatial Portals to Thinking, Feeling and Movement. They are the foundation of Visuo-Cognitive Therapy that still evolves today through our office, other private optometric offices around the world, and as well as professional organizations like Profectum and ICDL.  



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