Test Chart 2020

The first and still the best computerised Test Chart

Why the Thomson Test Chart?

The Thomson Test Chart software turns a standard PC into a powerful and versatile Test Chart for Optometrists, Ophthalmologists, Orthoptists and other eye care professionals.

Test Chart 2020 offers an unrivalled suite of test charts and vision tests, binocular vision tests and refraction stimuli. Simply install the software on your PC, mount a monitor on the wall, enter the screen viewing distance, perform a simple calibration and you have the Test Chart of your dreams!

Prof Thomson developed the first computer-based Test Chart in the early 1990s and released the first version for sale in 2000. Over 8000 eye care professionals in the UK alone now use the system making it the most popular computer-based test chart by miles!

The software benefits from over 20 years of research and development. While other companies have copied the concept, reviews consistently rate the Thomson chart as the most comprehensive and most intuitive to use.

Test Chart 2020 Software

£32/month (£345/year) +VAT

  • Includes all upgrades, updates and support. Minimum term 6 months.

Test Chart 2020 UPGRADE

£20/month (£216/year) +VAT

  • Upgrade from any version to the latest version for £20+VAT/month for one year. Normal subscription applies from year 2.

For multiple licences, please call for a quote.  Special rates are available for Hospitals, Universities and Research Institutions.

A whirlwind tour of the Thomson Test Chart

Testimonials ...

Other systems have attempted to copy the Thomson Test Chart but it is leagues ahead of the competition in terms of the range of tests and user friendliness

The days of back-illuminated and projector chart are numbered

The Thomson Test Chart is the single most important development in clinical vision assessment in decades

I can't imagine going back to a projector chart. The Thomson Test Chart has completely changed the way I practice.

It is by far the most cost-effective way of giving your practice a high tech feel. Patients walk straight past my OCT but are amazed by the clown who sticks his tongue out!

We put the Thomson Test Chart into our hospital eye clinic 5 years ago. The nurses love it and we find that we get far more reliable visual acuity measurements.

We tried a Japanese short-form chart for a while but the refraction results were not reliable so we swapped to the Thomson Test Chart. It is 100 times better and with a mirror I had no problem installing it in my small consulting room.

Test Chart 2020... in more detail

LogMAR charts:

The LogMAR chart has rapidly become the test format of choice for clinicians.  Test Chart 2020 includes a huge range of options for LogMAR charts including ETDR, Linear, Crowded Linear, Column etc.  LogMAR charts are available in 12 different optotypes including Sloan, British, Kay, Tumbling E, Landolt C, Makaton, Sheridan Gardner and in a number of different language fonts including Gujarati, Arabic, Punjabi and Hebrew.


Snellen charts

12 different optotypes can be displayed in the traditional  Snellen format including British, Sloan, Sheridan-Gardner, Landolt Cs, Tumbling Es, Kay pictures, Numbers, Gujarati, Punjabi, Arabic and Hebrew. A single row or column can be shown and a range of cursors are available to isolate specific letters or rows.

Single letter charts:

It is sometimes easier to show a single letter, particularly when testing children and those with learning difficulties. The size of the letters can be changed in 0.1 logMAR steps and crowding bars can be added. A wide range of optotypes can be displayed in single letter format.


Contrast sensitivity:

This chart is similar to the Pelli-Robson test. Patients are required to read triplets of letters of decreasing contrast. The minimum contrast required for the patient to read 2 out of the 3 letters is recorded as the contrast sensitivity. This measurement is particularly valuable for patients with cataracts and various neurological conditions such as glaucoma.

Refraction targets:

A wide range of targets are included for use during the cross-cylinder test. Targets include rings and dots of different sizes and rows of characters. Additional tests are available if a polarised monitor is used.


Fan and block test:

The fan and block test remains a useful test for identifying and correcting astigmatism.

Duochrome tests:

The duochrome test provides a rapid method for assessing patients’ refractive status. Test Chart 2020 allows various targets and optotypes to be presented against a duochrome background.


Phoria tests:

Test Chart 2020 includes a unique set of targets for use with the Maddox rod.

Associated Phoria tests:

The patient views the bars through the red/green visorprovided. The bars are moved until they appear to be aligned and a measure of the associated phoria in prism dioptres is displayed on the screen.


Fixation disparity tests:

Test Chart 2020 includes a range of fixation disparity tests. Red/green dissociation is used for non-polarised monitors while cross polarisation is used for polarised monitors.

Worth 4 dot test:

The Worth 4 dot provides a quick check for suppression. In this implementation the patient wears red / green spectacles (provided) and is asked how many dots they can see. 4= binocular, 3 = Left suppression, 2= Right suppression



Test Chart 2020 includes a distance random dot stereogram tests.  Dynamic generation of stereograms allows the disparity of the images to be adjusted to provide an accurate assessment of stereopsis. Generate shapes or letters in depth.

Vernier Acuity:

Vernier Acuity has been shown to be useful in assessing the potential vision of patients with cataracts. Simply measure the minimum displacement required for the patient to detect that the two bars are mis-aligned.


Fixation targets:

Test Chart 2020 includes over 200 different images for fixation including photographs, cartoons and a selection of spots and crosses. The images are arranged in groups and a slide-show of the images within a group may be shown during retinoscopy or ophthalmoscopy for example. Add your own images and videos if required.

Task images:

Test Chart 2020 includes a range of task images which simulate very screens and tasks that they may be called upon to read in everyday life. Sky menu, arrival board, sub titles, clocks - to name but a few.


UK number plate tests:

The “number” plate test remains the only statutory test of vision required for driving in the UK. Test Chart 2020 is capable of exactly replicating a series of front and rear number plates using the exact fonts and character spacing. The number plates can also be presented against a variety of backgrounds to simulate real world conditions.

LogMAR scoring utility:

Simply record the number of letters correctly read on each line and let the utility work out the LogMAR score and the equivalent Snellen acuity.


Stopwatch and Timers:

A number of clinical tests require timing.  Test Chart 2020 introduces a handy set of timing tools for use in the consulting room including a Stopwatch, a Coundown timer and a Metronome.

Contact Lens fitting tools:

Test Chart 2020 incorporates a powerful set of contact lens fitting tools to help with those tricky contact lens-related calculations.


Efron images:

Test Chart 2020 includes the complete set of Efron images for grading contact lens-related complications.

Tablet interface:

Test Chart 2020 introduces a two way link with a variety of tablets and smartphones including the iPad, iPhone and most Android devices to provide a powerful interactive remote control for the Test Chart and a huge range of near vision tests.

This requires the use of a third-party app such as Air Display or Duet which allow a PC to project to the tablet as a second/third display.


Interactive remote control:

Test Chart 2020 can link to a tablet to provide a fully interactive remote control.  A thumbnail of the current test chart screen is shown at the top of the display and running a finger over it causes a pointer to move across the main test chart.  All display modes and options can be selected from the tablet.

Using a phone as a remote control:

Test Chart 2020 can also link to most smart phones including iPhones and Android phones,  The remote control interface is automatically optimised for the smaller screen.


Near vision testing on a tablet:

Modern tablets are ideal for near vision testing, being light enough for the patient to hold and having the resolution to reproduce small test stimuli. Conventional near vision testing apps like the Vision Toolbox for the iPad (Thomson Software Solutions) provide a huge range of near vision tests and stimuli.  However, changing from one test to another requires the clinician to interact with the tablet which reduces the efficiency of this approach.
Test Chart 2020 provides a novel solution to this problem by using a PC to generate the stimuli which are then displayed on the tablet. This approach has all the advantages of using a tablet but uses a PC to control the display.

Test Chart 2020 provides a wide range of near vision tests when connected to a tablet. The patient is handed the tablet and asked to hold it at an appropriate distance. The practitioner can then change the vision tests remotely from the PC.


Near acuity tests:

Test Chart 2020 includes a range of near vision acuity tests including a LogMAR reading chart, single row reading test and a conventional Test Type test.  The text displayed can be edited and new text added.  The colour and contrast of the charts can be changed at the click of a button.

Near vision tasks:

One of the purposes of near vision testing is to ensure that the patient can perform certain near vision tasks like reading a directory of seeing the time on a watch.  Test Chart 2020 can display a wide range of images on a tablet screen to simulate these tasks.  The magnification of each image can be varied and new images can be readily added.


Near vision binocular vision tests:

Test Chart 2020 includes a wide range of binocular vision tests including phoria, fixation disparity and stereopsis tests. The patient wears red/green visors to dissociate the images for each eye.

Near vision stereopsis:

Test Chart 2020 can display random dot stereograms and a variety of red/green anaglyph images to assess stereopsis. These are generated dynamically allowing the stereo depth to be varied to assess stereoacuity thresholds.


Amsler charts:

The Amsler chart is designed to detect disturbances within the central visual fields associated with macula disease. The patient is simply instructed to look at the red cross in the centre of the grid and report if all the lines in the grid look straight and if any areas in the grid are feint or missing.Test Chart 2020 allows these areas to be indicated by “drawing” directly on the grid using a finger on the tablet. This image may then be placed in the Windows clipboard by selecting Edit … Copy from the menu at the top of the screen. The annotated grid can then be pasted into a word document, patient management software etc.