Binocular Vision Dysfunction (BVD) occurs when two eyes are not working together as a team. One eye is misaligned between the line of sight with the other eye. When the amount of misalignment is large, 複視： may happen. Whereas, when the amount of misalignment is small, a single image is maintained. Vertical heterophoria (VH) may occur due to the lack of coordination between two eyes. If this condition is left untreated, the patient may have vertical double vision.
What's the next step?
A comprehensive vision exam is recommended for all children (6-18 years) before they start school and every year while they are in school, which cover evaluation of external and internal eye health, color vision and refraction for optical prescription, and screening visual analysis of the functional visual abilities. However, when a child struggles with reading and learning or is not achieving his or her potential, a 眼科視覺神經發展功能檢驗 is needed.
In addition, if you have a younger child (toddler to 5 years) who has an eye turn (（斜視）) or lazy eye (Amblyopia) you should schedule a Neuro-Developmental Vision Evaluation. A Neuro-Developmental Vision Evaluation is also necessary for adults who struggle with reading or who have had a head injury of some kind. When children have special needs, are on the Autism Spectrum, or have other developmental delays a Neuro-Developmental Vision Evaluation is strongly recommended.
The Neuro-Developmental Vision Evaluation (NDVE) is much more in-depth than a regular eye exam. It takes approximately 1 to 2 hours and is given by our vision specialist & therapist on a one-to-one basis with the patient. The purpose of this testing is to determine how the visual system processes information, how vision integrates with the other sense modalities, and to determine whether the vision is supporting or interfering with performance to its full potential. Parents are asked to wait in the reception area during this testing. At the completion of this testing, scores will be tabulated and then presented at a consultation (scheduled at a different time) with our Behavioral and Developmental Optometrist, the patient, and/or the parents. Treatment options will be discussed.
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