Worth Four Dot

Dr. Heather McBryar cartoon

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Worth Four Dot

The worth four dot is an essential tool which helps the clinician understand what the patient is able to see from each eye. It is useful to detect if there is double vision or if there is suppression, which means that the brain is ignoring the visual signals from one eye. There are different causes for suppression and the worth four dot helps identify if the brain is paying attention to the signals from both eyes or if one eye is being favored over the other.

How it Works?

The patient wears glasses that have a red filter on the right eye and a green filter on the left eye. The eye doctor holds a special Worth Four Dot flashlight which comes with four circles on it. There is one red circle, two green circles and a white circle. The eye doctor holds this flashlight at various distances and asks the patient, how many dots do you see? What colors are the dots? Based on the patient’s response, the eye doctor gains a greater understanding of different aspects of the person’s visual system and if there is suppression of one eye.

Possible Outcomes

There are different possibilities of what a person who is wearing red and green glasses would see when looking at the Worth Four Dot. These include:
  • Four dots - this is the ideal result because it means that there is proper fusion between both eyes
  • Three green dots - this means that the patient is only seeing out of their left eye that has the green filter on it and they are suppressing the right eye
  • Two red dots - this means that the patient is only seeing out of their right eye which has the red filter on it and the left eye is being suppressed
  • Five dots - this means that there is double vision because in reality there are only four dots, however this person is seeing more than what is being displayed

This gives the eye doctor a lot of useful information of which eye is being favored and which eye is being ignored through suppression. It also is a helpful indication in how to move forward with the best treatment plan which will train the brain to use both eyes most effectively.

Possible Outcomes

Common Questions

Suppression occurs when the brain chooses to favor one eye over the other by ignoring the visual signals from one eye while only paying attention to the other. The purpose of this is to prevent double or blurry vision. This is the brain’s way of coping when the eyes are not properly working together, however with vision therapy, the brain can properly be trained to operate with both eyes.
There are various causes, such as Double vision, When there is a big gap in the prescription for optical correction between the two eyes, and Lazy eye, also known as amblyopia
Worth Four Dot
Dr. McBryar cartoon


The worth four dot is a very helpful tool which simply uses a special flashlight and red and green filtered glasses in order to detect if one eye is being favored over the other. This is also used to plan the proper treatment to help both of your eyes work together as effectively as possible.

Related Articles


Vision therapy is well worth the response, time and effort. Our Son had a hard time focusing and writing neatly. After vision therapy Seth could complete a task in half the time if previously took. His abilities to focus improved greatly and so did his handwriting.

Also, he was better at listening. As a parent, we wanted learning to be fun for our Son, and vision therapy made this possible.

Amanda T.

Vision Therapy is well worth the expense, time and effort. Our son had a hard time focusing handwriting neatly. After vision therapy Seth could complete a task in half the time it previously took his abilities to focus and improved greatly and so did his handwriting.

Also, he was better at listening. As a parent you wanted learning to be fun for our son and vision therapy made this possible.

Alexa H.

Vision Therapy has given or son the tools he needs to be able to scan and read the written word more effectively and efficiently.

He love working with John and these working sessions give him the motivation to gladly work on his homework assignments.

It amazed us to see the difference in the tracking of his eyes and along a line of it's from the beginning to the end of the treatment.

Dr. McBryar , Kristen and John  are all marvelous and we would recommend them to anyone I only wish that we would have found them sooner!

Charlotte M.

Prior to coming to the institute for vision development my son complained of daily headaches. Therapy has eliminated his headaches completely. I love knowing my son is able to learn pain-free for the rest of his life because of the work that has been done over just a few weeks in this office. He he absolutely loved coming that didn't even feel like going to a doctor or therapy. We are grateful for the relief he was able to find by coming here.

Thank you!

Olivia C.

Seems much less frustrated with life

Reads non-stop and fast

Spelling abilities have been hugely improved

Seems much more confident

Thank You!!!

Kelly O.

When we first came to the practice, my son did not have huge issues, but lots of small ones- trouble with reading, sports (hitting the baseball consistently), coordination, etc- that were not easily detectable,but when put together presented issues. The staff here were all very professional and loving towards him. While I was concerned in the reading, my son was concerned with the athletic side. Seeing improvement night off the bat gave him confidence that i have nor seen in him and made him want to not only Come to therapy, but also made him want to work hard. He has surpassed his grade level and above in reading and hit his first home run this year! Thank you!!!

Alice M.
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