Understanding Sensory Fusion: A Vital Test for Eye Health

Published on
March 16, 2023

Maintaining healthy vision is essential to live a fulfilling life. Our optometrist in Bellflower provides advanced functional vision testing to ensure your eyes and vision are working at their best. During a functional eye examination, various tests are performed to determine the overall health of your eyes. In this blog, we will discuss the significance of sensory fusion and how we use it to diagnose vision-related problems.

What is Sensory Fusion and Why is Binocular Vision Important? 

Sensory fusion is the ability of the brain to combine two images from each eye into a single image. This is vital for proper vision, as it allows us to perceive depth and distance accurately. Without sensory fusion, we would experience double vision, which can be debilitating and cause a range of issues.

How Our Optometrist Tests for Lazy Eye: The Worth Four Dot Test

The worth four dot test is a simple, yet effective, way to measure sensory fusion. The test consists of four dots arranged in a square. One dot is red, one is green, and two are white. During the test, the patient wears special glasses that alternate the image shown to each eye. This allows us to determine whether the patient's brain is fusing the images or suppressing one of them.

Interpreting the Test Results

The worth four dot test is interpreted by our optometrist based on the patient's responses. If the patient is fusing the images, they will see four dots, one red, one green, and two white. If the patient is suppressing one of the images, they will only see three dots, all green or all white. This indicates that the brain is not properly fusing the images, and further testing may be required to diagnose the issue.

Why is Sensory Fusion Important?

Sensory fusion is important for a range of everyday activities, such as driving, reading, and sports. It allows us to perceive depth and distance accurately and maintain our balance. Children with sensory fusion issues may struggle in school, as reading and writing require accurate vision. Adults may struggle with work-related tasks, such as using a computer or driving. Furthermore, sensory fusion issues may indicate other underlying vision problems, such as strabismus (crossed eyes), amblyopia (lazy eye), or binocular vision dysfunction.

Take our online visual skills assessment to help identify if you or your child has a potential visual deficit that may be interfering with success in the classroom, work, or sports https://amplifyeyecarelongbeach.com/about-us-practice-page/our-specialty/vision-therapy-specialty/vision-and-learning-quiz/ 

Schedule a Comprehensive Functional Eye Exam Today and Prioritize Your Eye Health with Amplify EyeCare of Greater Long Beach

At Amplify Eyecare of Greater Long Beach, we prioritize the measurement of sensory fusion during every eye examination. It is a vital test that allows us to diagnose vision-related issues early on and prevent long-term damage to your eyes. If you are experiencing any vision-related problems, contact us at (562) 925-6591 to schedule your appointment today.
Patients searching for functional eye exams visit our clinic from all over California, and we are proud to be a leading provider of medical eye care services for patients from Bellflower, Long Beach, Lakewood, and Los Angeles.


I haven't actually used the optometrist side, so my review is limited to the vision therapy offered.  This office was recommended by my occupational therapist for the treatment of my double vision following a stroke.

Claire A.

Love this location. I had a brain injury accident from day one one. All the team make you feel you still important and hope in the horizon after when the medical system fell you miserably. Dr. Ikeda very professional and very understanding about your issue. Two tombs up.

Jim K.

My husband and I were immediately impressed with Dr Ikeda. I was hit by a car while cycling which caused broken bones and three brain injuries. The brain injuries caused double vision. Dr. Ikeda examined my eyes and got me started on vision therapy with his occupational therapist who specializes in vision therapy.  She (Chris) is absolutely great.  I am impressed with the array of tools used to help recover my binocular vision.  I am doing things I never thought were possible (balance boards etc).  Chris pushes me and keeps me motivated. I really enjoy my sessions with her.  The office staff is always friendly and they have a wonderful appointment reminder tool that makes it easy to keep my calendar up to date. I am happy the rehab center at Little Co. of Mary recommended them!!

Teresa S.

The Vision Therapy is handled in a separate office through a different door from the shared waiting room. Chris, the vision therapist, has a wide and varied assortment of tools, equipment and resources to best evaluate and treat most vision issues. After just a few visits, my double vision became easier to control, using exercises developed during the therapy process. It was time well-spent.

Joe M.

I have been coming here since I can remember. I love it here. The staff is so amazing and nice. They explain everything they gonna do and never make you feel rushed. Dr. Ikeda has always been my doctor and I would never want another one. He is the doctor for my whole family and is always asking how everyone is doing. I am also so crazy about picking out my frames and have to try so many and each person who helps me take the time and lets me try them all on. I would never want to go anywhere else! I definitely would recommend this office to anyone looking for a great eye doctor.

Kayla W.

This is not for the eye exam but for the frames selection portion. I brought my prescription from Kaiser here with my VSP insurance. The reception staff was very polite and professional.  Manny helped me to pick out frames and explain my coverage.  Very helpful and patient not like the individual at the other place I rated here on Yelp.  I was running late and he still helped me and was not bothered at all.  I am so glad I came here ..........very pleased.

Very professional staff and pleasant.

Daniel G.
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