Based Visual Dysfunction

Utilize evidence-based assessment tools for vision disorders related to neurological conditions

KDt Tablet Apps

Performance Facts

K-D Test products measure eye movement speed and accuracy during rapid number naming in which a series of single-digit numbers is read aloud.

Performance on the K-D Test requires vision and eye movements involving the integrated function of the brainstem, cerebellum and cerebral cortex (Lancet, The Neuro-ophthalmology of Head Trauma, 2014). Cognitive processing is also required including:


Pathology in any of these functional pathways may result in errors and poor K-D Test performance (Concussion, The King-Devick test of rapid number naming for concussion detection: meta-analysis and systematic review of the literature, 2016).

Vision alone accounts for more than 50% of the brain’s pathways, making vision and eye movements particularly vulnerable in brain injury (Lancet, The Neuro-ophthalmology of Head Trauma, 2014).

Following a brain injury up to

90% of patients experience vision-related symptoms (Occurrence of oculomotor dysfunctions in acquired brain injury: A retrospective analysis, 2007).

Neurological Pathways Involved in K-D Test Performance

Highlighted areas shown here include those responsible for planning, initiation and execution of the coordinated functions of vision, eye movement, attention, language and concentration required for successful performance on the K-D Test (Lancet, The Neuro-ophthalmology of Head Trauma, 2014).

Software Products

K-D TEST Pro Monitoring

K-D TEST Pro Monitoring

Price: $700 (USD) (15 Subject Licenses)

Objectively and quantitatively monitor King-Devick Test progress.

Use charts and graphs to capture K-D Test performance over time.

  • Quickly and easily administer K-D Test to monitor progress
  • Normative data for patients over 15 years old
  • Automated Speech Recognition for scoring
  • For in-office or at-home use

K-D Recovery Acceleration Program

K-D Recovery Acceleration Program

Price: $650 (USD) (10 Subject Licenses)

Improve eye movement deficits in subjects suffering from oculomotor dysfunction.

K-D Recovery Acceleration Program is a web-based oculomotor program with compliance monitoring.

  • Set goals and tailor programs for individual subjects
  • Monitor real-time outcome measures and compliance
  • For in-office or at-home use

King-Devick Test in association with Mayo Clinic

King-Devick Test in association with Mayo Clinic

Price: $20 (USD)

Sideline Assessment For Impaired Eye Movements.

Ideal for providing medical outreach services for sports clubs and schools.


K-D Eye Tracking Software System

Contact a Specialist for Pricing

Bring quantitative tools to clinical management.

Provide detailed assessment of oculomotor function during performance of K-D Test.

  • Quantify impairment severity and recovery progression
  • Display eye metrics
  • Easily evaluate change over time

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