Difficulties at
school: is it dyslexia?
People with specific learning difficulties have problems with certain skills at school. The most common type of specific learning difficulty is specific reading difficulty; and this is often called dyslexia. Dyslexic children are usually poor at spelling and may seem intelligent in conversation, but have trouble with written language. If a person is dyslexic then it does not mean that they are unintelligent: Leonardo da Vinci and Einstein are both thought to have been dyslexic.
Dyslexia is best diagnosed by an educational psychologist who, in addition to other tests, will calculate a person's expected reading age from their intelligence and age. The difference between this and the actual reading age, as measured with a reading test, gives a measure of the reading difficulty. The term dyslexia is usually reserved for a severe degree of reading difficulty. Psychological assessments can be arranged through your school, or privately through an organisation called Dyslexia Action.
The term dyslexia is used throughout this document, but the visual problems that are described can also be present in children who have other, non-dyslexic, difficulties at school. A person does not have to be diagnosed as dyslexic in order to benefit from the tests outlined here.
Visual factors and
school difficulties
Most experts agree that problems with sight are not usually
a main cause of dyslexia. Certain visual problems, however, do occur more often
in dyslexia and these may, in some cases, contribute to the reading difficulty.
These visual problems would not normally be detected in a 
school
eye test. Two of the most common visual anomalies in dyslexia are poor or
unstable co-ordination of the two eyes (binocular instability) or a reduced
ability to focus close to. These visual problems can cause eyestrain, visual
distortions, or headaches. This may slow reading and discourage children from
prolonged reading.
Not all dyslexic people have these visual problems, but some have visual anomalies without realising it. People with a mild specific learning difficulty, perhaps not bad enough to be called dyslexia, can also have these visual problems. These problems might cause difficulties in perceiving the correct order of numbers as well as letters on the page. For some people, this might contribute to difficulties with mathematics. The visual problems can usually be treated with simple eye exercises. In some cases, glasses may be prescribed.
An eye examination with an optometrist will not be able to diagnose dyslexia. But if dyslexia is suspected then it is sensible to start by investigating whether the visual function is normal.
Our Eyecare for
Dyslexic People
Our principal optometrist, Professor Bruce Evans, has been described as “the UK’s foremost expert in the area of visual correlates of dyslexia”. Professor Evans’ doctorate was on this subject and he frequently lectures on this, both in the UK and in many countries. His research has been published widely, including a book for teachers, psychologists, and parents called Dyslexia and Vision. For more information on (or to buy) this book, click on Dyslexia and Vision and search for Dyslexia and Vision. He has also co-authored a book on Vision and Reading Difficulties which has become a respected textbook for eyecare practitioners on this topic.
Professor
Evans is able to see patients at the practice to carry out a full eye
examination and specific additional tests to look for the visual problems that
may be associated with difficulties at school. These appointments usually take
about 1 hour and the fees are detailed on the Eyecare page
of this website.
These fees include a report explaining Professor Evans’ investigations, results, and recommendations. Many tests are necessary at the first examination but it is not usually appropriate to repeat all of these at subsequent consultations.
If you would like to arrange an appointment with Professor Evans, please telephone our reception and ask for a special investigation for the assessment of visual aspects of specific learning difficulties. When the appointment is arranged, we will send you written confirmation, a map directing you to the practice, and a questionnaire. It is very helpful if you can complete the questionnaire and bring it with you to the appointment. If would like another copy of the questionnaire then it can be downloaded by clicking: specific learning difficulties questionnaire.
Tinted Lenses and
Dyslexia
Some
people with dyslexic difficulties benefit from using coloured filters. 
If
our findings suggest that a person may benefit from colour, then we will issue
them with a coloured overlay to try at home and maybe at school. If this is found
to be helpful then a further appointment can be arranged for testing with a
special instrument, the Intuitive Colorimeter (illustrated on the left). This
enables the precise tint for glasses to be determined. The charge for this
further investigation is detailed on the Eyecare page
of this website.
Continuing Care
For patients who are prescribed Precision Tinted lenses the exact colour of tint that is required can, like any other optical prescription, change over time. Therefore, we usually repeat the testing with the Intuitive Colorimeter at yearly intervals.
Useful Addresses
The British Dyslexia Association is a support group which can give information on the legal situation concerning learning difficulties and legislation on education. Their address is 98, London Road, Reading, Berks., RG1 5AU.
Dyslexia Action has many local offices where
psychologists can assess learning difficulties and specially trained teachers
can help to overcome these problems. Their head office address is 133, Gresham
Road, Staines, TW18 2AJ. The address of their local centre in Essex is
Chelmsford Dyslexia Action, 137 New London Road, Chelmsford, Essex, CM2 0QT.