Visual Assessments

The Dyslexia Research Trust (DRT) was set up to investigate visual causes of reading difficulties and to develop treatments to overcome these.  We see any child who is struggling at school; we work out what is going wrong, we suggest appropriate treatments including blue or yellow filter spectacles and we offer continuing support.

If a child experiences any of the visual symptoms below, we may be able to help:

  • Blurred letters or words 
  • Letter movement - jumping around, shaking or back to front
  • Colour changes
  • Glare or oversensitivity to bright lights
  • Headaches 
  • Concentration problems
  • Other visual discomfort

Research Studies

We carry out research studies as well as providing specialised visual assessments and measurements of reading and spelling to compare with general ability, in order to evaluate whether literacy skills are lower than they should be.  But please note that the visual assessment does not diagnose 'dyslexia'.

Children between the ages of 7-11 years are invited to take part in research studies at our Reading Clinic.

Visual Investigation

We test near and distance vision. If reduced, we try to improve the responses through blue and yellow lenses. We assess binocular vision, how well the two eyes work together, particularly in the reading position. This is important to ensure that the child never sees double and the words stay still and clear.

We test 3D vision, as another indicator of how well the eyes work together and the way the brain is processing the visual information.

We use the Ishihara test of colour vision to identify colour blindness and low contrast sensitivity.

Eye movement control is assessed from observation and also using an eye tracker. The fixation, pursuit and saccadic control systems all affect the accuracy of tracking across the page which is vital to determining the order of letters in a word.

Our main research studies the way in which our special blue and yellow glasses can help to relieve visual symptoms and improve the processing of letters by the brain.

Recommendations and Continuing Support

Finally, we discuss all the results with the parent and child, suggesting ways to improve each individual child’s particular problems.

As treatment we often suggest viewing text through blue or yellow filter glasses which we provide. Also we often suggest taking omega 3 fish oil supplements to help visual concentration and immediate auditory recall. We have also found that we may be able to help improve a child’s abilities in tests of similarities and matrices. We offer advice as to how parents can work with their child at home to improve all aspects of reading. We follow up most childrens' progress for at least 6 months to make sure our treatments and suggestions are working and to provide continuing help. If necessary, we may continue to monitor them over a longer period of time.

A full report of all findings is sent to parents to show to their child's school if they wish.

We would like to emphasis that all the results we obtain remain entirely confidential and nothing we may publish or talk about could ever be identified with individuals.

Referral can be made by parents directly to the clinic in Reading, phone: 0118 9585950, or via


Please contact the clinic helpline 0118 958 5950 if you are unable to attend so that we can offer the appointment to someone else.  We have to make an administration charge of £30 if you fail to attend without at least 48 hours notice.