There have been a number of methods of assessing visual perceptual problems.

It started with the syntonics movement in the 1930s, was developed by Helen Irlen and Arnold Wilkins and has now been taken to a different level by Orthoscopics. (I may be biased - I was part of the team that developed the instrumentation, tests and new types of lenses as a response to the inadequacies of previous systems)

In education overlays and coloured rulers have been used to help children but now these methods must be considered obsolete and poor practice due to
   the poor range of overlays within colour space makes it almost impossible to get the best colour
   the near certainty of missing the worst problems and assuming that there is no problems
   metamerism i.e. ambient light change from assessment lighting

All the previous methods of assessing lenses suffer from 3 problems - a poor range (although they claim a large number of lenses - the colour range is poor), the assessment methods are often wildly inaccurate and the protocols of testing are limited.
Orthoscopics is completely different - it is accurate, based on retinal neuro-physiology, the lenses were developed to fit the need (not the other way round - it makes a big difference) and it is the only system that can be described as "gold standard"
And what of the assessment techniques and responses from the patient - the differnce is marked.


Watch this short video - it is an advert - but it will show you some of the many effects we assess.

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