Cantwell Vision Therapy Centers

With offices in Ashburn and Annandale, Virginia, Dr. Dennis Cantwell, Optometrist and his staff have been providing quality developmental vision care to patients for over 30 years. He is board certified in Vision Therapy.

With offices in Ashburn and Annandale, Virginia, Dr. Dennis Cantwell, Optometrist and his staff have been providing quality developmental vision care to patients for over 30 years. He is board certified in Vision Therapy.

[04/06/20]   Most of our patients have moved to our interim remote vision therapy program and it is working with great success! Patients are working with therapists through an online meeting platform until it is safe to return back to in-office VT. If you were enrolled in our program before the stay-at-home order and have not yet scheduled for remote vision therapy, please call our office right away so we can get you moving! (703) 729-3545.

[03/23/20]   I am excited to announce that I have worked the past week developing an effective remote vision therapy program for our patients so you can continue to make gains during this time. I can implement this tailored-to-the-patient program immediately. I will be contacting all of our patients/parents by email today. Stay safe. Kindest regards, Dr. Cantwell

A resource for parents - I hope you find this helpful!

Spot-It Party Game (Color of Packaging May Vary)

Parents are asking what they can do to keep their children's visual skills improving. I'll provide a detailed list a bit later, but for right now, let me share one of my all time favorite games: Spot It! Fantastic for visual memory, tracking, and visual discrimination. And fun as well!! Packaging Color & and Packaging Labeling May differ. Same exact contents within. Exact same manufacturer UPC Bar Code, Same manufacturer product number. Sam exact game except the color and wording on packaging may vary.

[03/16/20]   March 16: Today my staff and I will be discussing a detailed action plan which will be implemented immediately which includes: 1) arranging the VT schedule in order to limit VT sessions to 2 patients or less at one time; 2) "Buffered" scheduling for Dr. Cantwell, allowing more time in between each of his appointments which will limit the number of people in the waiting room; 3) Having all patients wash their hands as soon as they enter the office. These are just a few of the changes that will go into affect. Current Vt patients expect a call and email with more details.

The ultimate goal to have as few patients in the office at one time so we can continue to serve patients and their needs in a safe manner for them and the community at large.

If you or your child are sick or have a fever, please reschedule your appointment as soon as possible.

[03/16/20]   March 15 UPDATE: Our office will open Monday the 16th and VT sessions run as usual; all VT patients/parents will be contacted Monday regarding our plan to limit the numbers of patients in each session and in the waiting room going forward.

Cantwell Vision Therapy Centers's cover photo

[09/21/19]   It is official: Our Annandale office is now closed. Dr. Cantwell now sees all patients in our Ashburn location at 44075 Pipeline Plaza #100, Ashburn, VA 20147; Phone: (703) 729-3545. Stop by and see us!

[12/11/17]   This is a test post. 12/11/2017

NowThis Future

This 17-year-old made a huge discovery that could change the way we deal with brain injury

Stirred Up

What these children with learning disabilities have to say is really important and something all adults need to hear. I had no idea! - via

College of Optometrists in Vision Development

The research is stacking up--amblyopia (lazy eye) treatment with vision therapy is better than patching alone! Watch COVD Fellow Dr. Brenda Heinke Montecalvo tell us why and read about the advantages. Learn more at

[03/15/17]   WED MARCH 15: Ashburn office open on time.

[03/15/17]   WED MARCH 15: Annandale office open 10:30 am.

[03/14/17]   TUE MAR 14: Annandale, Dr. seeing patients; VT therapist calling VT patients for sched.

[03/14/17]   TUE MAR 14: Ashburn office closed.

Vision therapy is changing lives

Fantastic article about how vision therapy helped change a young person's life for the better.


Here is a simple fine motor activity with playdoh and pasta that every toddler will enjoy

[01/14/17]   Saturday, Jan 14: Both offices OPEN for vision therapy.

[01/07/17]   SATURDAY, JAN 7: Ashburn Office Open for Vision Therapy/Dr. Cantwell sched appts.
Boost Post

[01/07/17]   SATURDAY, JAN 7: Ashburn Office Open for Vision Therapy and Dr. Cantwell appointments.
Boost Post

[01/07/17]   SATURDAY, JAN 7: Ashburn Office Open for Vision Therapy and Dr. Cantwell appointments.

[12/17/16]   Annandale VT Saturday: OPEN

[12/17/16]   Ashburn VT today: 8:45 & 9:30 CANCELLED; Open for 10:15 onward.

[11/25/16]   THANKSGIVING WEEKEND: No vision therapy in Annandale or Ashburn.

College of Optometrists in Vision Development

Look at this! A new post at The Vision Therapy Center, Inc.'s blog gives a full profile on everything we do and all we're trying to achieve, including words from President Dr. Barry Tannen. The staff there boasts a full roster of COVD Certified optometrists and vision therapists!

College of Optometrists in Vision Development

Out of Fox Vision Development comes a fantastic article featuring COVD Fellow Dr. Robert Fox and vision therapist Elizabeth Levy, explaining why a school vision screening isn't enough and how vision therapy can help children struggling in school!

College of Optometrists in Vision Development

Dale Earnhardt Jr. is working hard to return to the driver's seat with treatment that includes vision therapy!
"I struggled with my eyes for a while," Earnhardt said. "I'm starting to see improvements there, which I was thrilled to wake up one day and feel a difference."

College of Optometrists in Vision Development

After a major concussion left the world blurry and doubled, Abbie needed help to get back on track in school. In our final Vision & Learning Month Success Story, read about her recovery with vision therapy as well as her advice to others who share a similar struggle! #augustvisionlearning2016

College of Optometrists in Vision Development

COVD Fellow Dr. Samantha Slotnick did a TV interview to share important info about vision therapy in honor of Vision & Learning Month! Thanks for spreading the word, Dr. Slotnick! Learn more about the connection between vision and learning at ! #augustvisionlearning2016

Why a Child Eye Exam Belongs on Your Back-to-School Checklist Bad vision can negatively affect academic performance.

College of Optometrists in Vision Development

This Olympian equestrian from Great Britain has been able to return to the saddle after a severe concussion thanks to vision therapy! Locate a Doctor near you to get help if you or your child is having vision problems after a head injury:

[07/12/16]   ASHBURN OFFICE CUSTOMERS: main phone line is down, please reach us at (703) 729-3546.

Vision Therapy at Lyons Family Eye Care

If your son or daughter has ADHD or other attention problems, more than likely they also have significant eye and vision problems as well. "These problems do not improve when ADHD medication is given."

LFEC can help. Besides comprehensive eye and ision assessment and treatmente, we also have the TOVA test a computerized assessment of attention) available for our patients.

Read the article below for more information:

Visual function and ocular features in children and adolescents with attention deficit hyperactivity disorder, with and without treatment with stimulants

Results: High eso/exophoria, subnormal stereovision, abnormal convergence, astigmatism (greater than or equal to1.0 D), visuoperceptual problems, smaller optic discs) and neuroretinal rim areas and decreased tortuosity of retinal arteries than that of controls.

Have LFEC evaluate your child wit ADHD soonest!

College of Optometrists in Vision Development

All the more reason to have your child to receive a comprehensive eye exam from a member of COVD!

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44075 Pipeline Plz #100
Ashburn, VA

Opening Hours

Monday 10:00 - 18:00
Tuesday 10:00 - 18:00
Wednesday 10:00 - 18:00
Thursday 10:00 - 18:00
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