Specialising in Paediatric Vision Testing
Specialising in Paediatric Vision Testing

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Kay iSight Test Professional App

Available for iphones and ipads


The Kay iSight Test Professional app lets you measure and record near and distant visual acuity in children from 18 months of age through to adults. It is simple and intuitive to use, making your testing quick and easy.

The FREE setting provides a distance, letter test and new subscribers have a one-month free trial to test all the additional features. Cancel at any time.

The app uses international standard letters and Kay Picture optotypes for young children and others with a learning disability. In addition, near reading text is provided as short paragraphs or single, high frequency words.

NEW for 2021 is the addition of a point of light fixation target plus 4 animated images and two static scenes.

Using a suitable Bluetooth mouse, the app can be operated remotely to test at distance. See a short demonstration here.

The Kay Picture Test is the only fully validated picture vision test with accurate, recognisable pictures and evidence-based crowding. This app is registered and CE marked as a medical device with MHRA.


  • Choice of 6 or 8 letters and pictures for acuity testing.
  • Various testing distances from 33cm to 6 metres.
  • Reading text in 12 sizes from N48 to N5.
  • NEW! Near and distance fixation targets.
  • Offers single, crowded and chart presentations.
  • Notation in LogMAR, plus Decimal or Snellen (metric or imperial).
  • Easy to increase and decrease the size displayed.
  • Simple to refresh the optotypes on screen.
  • Records visual acuity results for each eye.
  • Saves your results for later review in test history.

You can cancel the subscription at any time during the introductory free period and pay nothing. If you wish to use the app after the free period, payment will be taken by iTunes (£4.99 per month, or £35.99 per year).

Research articles:
The Redevelopment of the Kay Picture Test of Visual Acuity

JAMA Ophthalmol. 2021; doi: 10.1001/jamaophthalmol.2020.6177 Visual Acuity Testing for Telehealth Using Mobile Applications Benjamin J. Steren, BA; Benjamin Young, MD; Jessica Chow, MD


Home User

If you have been asked by your eye professional to use the Kay iSight Test Pro app during the Covid-19 pandemic, please read the information below.

During the Covid-19 pandemic some eye professionals are offering their patients remote support and advice in monitoring their own eye condition by a home vision test.
If you have been contacted by your eye professional, you may download the Kay iSight Test Pro and safely use it under their guidance. Patients must not test their own visual acuity without the help, advice and support of a qualified eye professional. These professional titles are ophthalmologists, orthoptists and optometrists.

Kay Pictures is not offering technical or clinical support to patients. You must contact Apple support for any difficulty with installing the app and contact your eye professional for all clinical advice and support.

You can cancel your subscription at any time from within the app or if this function is not supported by your device’s version of iOS please read this guide showing you how to cancel through your device’s settings

Business User

If you would like to make iSight Test Pro available to a number of users within your department or practice, please refer to the Apple Business Manager Guide which can be downloaded here.

Demo Videos


For a full overview of our terms and conditions of iSight Pro, please click here.


“Fabulous App! Kay pictures is a fabulous app. It is able to be set at multiple viewing distances and is ideal for use in our remote offices. We recently found that it could be used with a mouse from across the room. It is simple, intuitive and just plain works well.”
PA Doc, Lancaster

“Kay’s crowded picture testing using the iPad app has transformed our practice, we are so mobile and it is great for those children who usually would take a longer time to warm to you/testing!”
Laura, Senior Orthoptist, GCUH, Australia

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