EyeDetect FAQ

Here is everything you need to know about EyeDetect lie detector test. However, if you have a specific query, please get in touch with our customer support team on 0800 368 8279 (Free Helpline)

What is EyeDetect?

EyeDetect is a non-intrusive technology that analyses eye behaviour, detecting lies within 30 minutes. It is the first technology of its kind in the world today. This ocular motor deception test is efficient, cost effective and secure.

How does it work?
Sitting at an EyeDetect workstation the examinee answers a series of true/false questions on the computer screen. An infra-red scanner measures changes in eye behaviour during the test. Taking 60 measurements per second, the high-speed camera will measure blink rates, reading behaviour, gaze fixation, pupil dilation, question response time, accuracy of responses and other variables.
How accurate is the test?

With EyeDetect a single-issue test is up to 91 percent accurate.

Using EyeDetect+ (with polygraph) 97-99 percent outcome confidence.

How long does the test take?

EyeDetect (optical only) – up to  30 minutes

EyeDetect+ (with polygraph) – up to 60 minutes


What will be asked in the test?

There are normally 3 sets of questions/statements depending on type of test.  All of which requires a True or False response.

The first set of questions/statements will be specific to the issue of interest such as infidelity or theft for example.

The second and third set of questions/statements are used to help determine a baseline reaction when the examinee is telling the truth. An example of this could be 1 + 1 = 2?  (True) or Many people drink coffee or tea in the morning (True). The computer will also require to get a baseline reaction for when the examinee is lying.  So the examinee will also be asked questions about themselves that they are required to lie about, an example of this could be “In my entire life as an adult, I have never broken a rule.” Since everyone has broken a rule at some point in life the examinee would deliberately lie and answer “False.” 

Practice test(s) will be conducted to ensure the examinee is fully focused on the questions/statements presented to them.


I have more than one issue, can I take 2 tests?
Yes, this is possible, however Converus recommends a minimum one-hour break between tests. In this break we would recommend that you go have lunch or perhaps go for a leisurely walk and avoid doing anything that is mentally challenging.
How long does it take to get the results?

A detailed test report with the results is provided within 12 hours.

Why would a dishonest person agree to take an EyeDetect test?
A refusal to take any form of lie detector test does not necessarily indicate that a person is guilty. Natural nervousness is often the reason that examinees are hesitant. This is particularly the case with polygraph examinations.
However, EyeDetect is non-intrusive so there are no sensors, cuffs or other equipment attached to the examinee, providing a more relaxing experience.
Can you cheat EyeDetect?

Currently there is no evidence to suggest that EyeDetect can be cheated. Some examinees attempt to “fool” the system by implementing countermeasures. A countermeasure is an action taken by a person to defeat or distort the test.

Countermeasures that we know do not work are:

  • Closing eyes or squinting when answering questions are easily observed by the test examiner and the test will be stopped.
  • If the examinee gives a ‘false’ response to most questions or is responding randomly or choosing not to respond to a significant number of questions, EyeDetect will observe these patterns of behaviour,  returning a “not credible” test score and the examinee will fail the test.

Other examples of countermeasures include physical movement, mental exercise, or the use of drugs. The goal of using countermeasures is to alter physiological changes to try and affect test results. However, in the case of EyeDetect, eye behavior changes observed during questioning are related to increases in cognitive load and are involuntary. They cannot be controlled.

In addition, the fast pace of questions administered during an EyeDetect test make implementing an effective countermeasure extremely challenging.


Can I sit in on the test?

For privacy reasons and to minimise distractions, others should not be able to see the examinee during the test, except for the Test Examiner.

How old do you have to be to take an EyeDetect test?
Usually, children under 14 years of age do not possess the comprehension required to take the test, so 14 years and upwards. For optimum accuracy, the examinee must have good cognitive function with good English language skills and must understand the concept of honesty. Suitability checks will be carried out with the minor and parent/guardian prior to us accepting the test.

Signed parental consent is required for children aged under 18 years.

I wear glasses, will this cause issues?
No, however where possible, it is preferable that the examinee does not wear bi-focal and tri-focal eyeglasses when testing. The Eye Tracker can potentially misread pupil size changes due to the magnification changes that occur with bifocals or trifocals when the examinee tilts his/her head. If an examinee uses bifocals or trifocals, the font on the computer screen will be set to the largest size so that the test validator can determine if the examinee can read the text on screen without the use of glasses. If this option doesn’t work, the examinee will be provided with a set of non-glare reading glasses.
Can prescription medication affect the test?
Eye drops or other eye medication may affect the test results. It is better to finish the course before booking a test.

Most prescription drugs, including anti-anxiety and anti-depressant medication, will not interfere with the accuracy of the test, but please check with our customer support team before booking a test.

EyeDetect has been used to successfully test examinees that use anti-depressants and anti-anxiety medications.

Alcohol and recreational drugs should not be consumed for at least 24 hours before a test.

Which conditions affect an EyeDetect test?

Test results may be affected by dry eyes and excessive eye makeup. In these circumstances, the test validator will ensure that EyeDetect can track the examinee’s eye behaviour using a simple calibration method.

EyeDetect is a reading test. However, if an examinee’s reading skills are poor the Converus Audio MCT testing protocol can be used. 

Other conditions that may distort the outcome of the test include:

  • Multiple system atrophy (MSA)
  • Brain or spinal injury
  • Disorders that affect the brain stem and hypothalamus, autonomic ganglia or spinal cord
  • Parkinson´s disease
  • Multiple sclerosis (MS)
  • Diabetes mellitus
  • Any disease or condition that causes hypotension 

Conditions that do not affect the outcome of the test include:

  • Heart arrhythmia or related issues
  • High functioning Asperger´s syndrome
  • ADD – Attention Deficit Disorder
  • Anxiety Disorder
  • PTSD – Post Traumatic Stress Disorder
  • Pregnancy
  • Asthma or other related respiratory diseases
How much does and EyeDetect test cost?

The cost of a single EyeDetect Optical Test is £345 inclusive of VAT.
The cost of a couples EyeDetect Optical Test is £545 inclusive of VAT.
Three or more tests taken on the same day at the same location are £245 inclusive of VAT each.


The cost of a single EyeDetect+ with Polygraph Test is £395 inclusive of VAT.
The cost of a couples EyeDetect+ with Polygraph Test is £595 inclusive of VAT.
Three or more tests taken on the same day at the same location are £295 inclusive of VAT each.

The price includes the services of a licensed, fully trained Converus test examiner and a printed report of the results.


Why is the booking fee non-refundable?

The booking fee for an EyeDetect test confirms the examinee’s intention to take it. Booking slots are scheduled with several tests per day being conducted. If the booking is cancelled without giving the required minimum 48 hours’ notice, it disrupts the test examiner’s schedule and incurs test licensing costs. 

In addition, a guilty party may show proof of booking a test to give the impression that they have nothing to hide, then cancel it. Please ensure, when booking a test slot for an examinee that they are available and agreeable to attend the appointment. This avoids the loss of fees paid.

In this way we can keep EyeDetect tests at reasonable and competitive prices.

How do I book an EyeDetect test?

You can book a test using the secure and simple to use booking system on our website. Alternatively call our free helpline on 0800 368 8279 and our customer support team will be happy to take your booking on the phone.

In most cases you will be able to arrange a test within one or two days of your order being confirmed. For tests that need to be conducted urgently (same day or next day) we require payment in full at the time of booking.

What is the science behind EyeDetect?

There have been numerous peer reviewed articles published on the accuracy of the EyeDetect technology and you can access them all by clicking here.

Broadly, these ocular motor deception tests are between 88 and 91% accurate depending on the type of test. Scientists on the Cornverus Science Team continue to work on methods to improve accuracy. The data from frequent field studies assist them in optimising the algorithm to increase overall accuracy.

An EyeDetect test is automated and administered by a computer. When the analysis is complete, of the subject’s responses and eye behaviour data, the Converus Credibility Score is calculated.

The algorithm measures and records variables that include blink rates, reading behaviour, gaze fixation, pupil dilation, question response time, accuracy of responses and other variables. The reason for analysing these variables is to achieve a test result of deceptive or credible.

The scoring method used by EyeDetect, seeks to “maximise the likelihood” of the categorisation of deceptive or credible. If the test results in a Converus Credibility Score of 50 to 99, it indicates credibility. However, deception is indicated if the score is between 1 and 49.

The nearer a score is to 99 the higher the credibility of the subject is. Scores closer to 50 indicate minimal credibility.

When the score has been calculated, a test report is created within minutes.

What is Converus?

Credibility Assessment Technologies LLC was formed In October 2009, a company specifically set up to market the new lie detector test technology. In September 2013, the technology was branded ‘EyeDetect’.

On 12 December 2013, the company was officially renamed Converus, Inc. The name Converus is derived from two Latin words: con (meaning “with”) and verus (meaning “truth”). The company’s head office is currently in Lehi, Utah, USA.

Eye-Detect.UK are licensed test examiners for Converus.

Can EyeDetect be submitted as evidence in court?

It can be submitted but it is at the discretion of the judge as to whether it will be admissible. 

In the USA case – State of New Mexico (plaintiff) vs. John Rael (defendant), Judge Jeff F. McElroy allowed EyeDetect evidence to be admitted (Daubert motion). This criminal sexual assault case was heard in the 8th District Judicial Court, County of Taos, New Mexico in May 2018. Mark Handler of Converus was the expert witness.