Binocular Disorders

Experts estimate 80 percent of what we learn is acquired through vision.

When an adult or child sees 20/20, that does not always mean that the eyes are working together properly. There are many types of vision dysfunctions. Some can cause eyestrain, double vision, blurred vision, headaches, motion sickness, or dizziness. Some are visual impairments such as Amblyopia and Strabismus (eye turn) issues.

In its early stages, convergence insufficiency is the most treatable binocular dysfunction. Studies have shown a 70-95% success rate in treating convergence insufficiency.

Vision Therapy is the preferred treatment for many of these dysfunctions

Both children and adults can benefit from vision therapy for the treatment of binocular (two eyes) dysfunctions, Strabismus (an eye that turns), Amblyopia (reduced vision in one or both eyes), eyestrain from computer use, and for general visual enrichment.

Some of the signs and symptoms of having vision problems are listed below:
Frequent headaches Eye tire quickly when reading or doing homework Head moves when reading across the page
A finger is needed to keep place while reading Skips lines, words, or letters when reading Closes or covers one eye for near work
Difficulty copying from the board Complains of double vision Rubs eyes when reading
Excessive blinking Holds book close to face when reading Reduced attention span, can only concentrate for a short amount of time
Covers one eye by leaning on a hand Spends a long time doing homework that should only take a few minutes Must re-read material several times to understand what has been read
Avoids activities that include reading or close-up work Avoids academics  

If you would like to explore how Vision Therapy can help with any of the above issues, make an appointment with Dr Kageyama for a free consultation or Full Functional Vision Performance Evaluation.


"In first grade, Brandon’s school had a vision test and they noticed that both his eyes would cross slightly. They recommended that I take him to an optometrist for further testing. I took him to a new optometrist, she confirmed that his eyes do cross and she recommended that we take him to Dr. Kageyama, a vision therapy specialist. I thought that Dr. Kageyama would be a good fit for my son based on all the positive reviews I have read. I made an appointment and after the consultation, I was told that Brandon would need 40 sessions of vision therapy to help his strabismus and depth perception.

Dr. Kageyama was very patient with my son, even when he had bouts of stubbornness. The doctor kept me well informed of my son’s therapy every step of the way and gave me progress reports. Midway through the therapy, I realized how much Brandon’s vision had improved. It turns out the slight crossing of his eyes gave him double vision which he wasn’t aware of since it was something he was born with.

As soon as Brandon realized he was seeing double and with the aide of therapy, he was able to change what he sees and make it converge. This change enabled him to improve in many areas academically and physically.

  • He developed better balance and learned how to ride a bike.
  • He also began reading and increased his reading level.
  • He finished the entire Harry Potter series within a few months.

At the end of therapy, the doctor accessed that his reading was at the 7th grade level. Vision therapy has significantly improved Brandon’s vision, which affects all areas of his life."

(Brandon’s mother 2011)


Contact the office of
Colin J. Kageyama, O.D., FCOVD

at (408) 376-2700
to Schedule a Free Consultation or a Full Developmental Optometric Evaluation.

Conveniently located in Campbell, California.
Minutes away from San Jose, Cupertino, Los Altos, Los Gatos, and Saratoga

Our new branch office opened in December and is located in Los Altos!