A typical eye test assesses the ability of an eye to read a letter at 20 feet (6 metres) called acuity. Reading the "normal" line on the chart is recorded as 20/20 (or 6/6). If you can only read the letters twice that size, the acuity is recorded at 20/40 (or 6/12), meaning that you are only able to read a letter at 20 feet (6 metres) that a normal person could read at 40 feet (12 metres)
An Optometrist will carry out a variety of tests to identify the lens that gives the greatest clarity at 20 feet, and where necessary prescribe these lenses to give patients this clarity for distance. Typically over the age of 40 our focusing system fails to provide clear vision at near (presbyopia), so spectacles are additionally provided to improve reading vision
A basic eye test in the Vision Centres is different!
At the Vision Centres, even our basic eye tests include additional tests that we have developed over the years to identify how a child's visual system is performing. We automatically check out the quality of eye movements, check the possibility of convergence insufficiency and focusing limitations.
Eye health is generally checked with digital retinal photography to ensure good eye health
In addition, we are able to identify unique lens designs that can improve visual function, extend reading range and improve reading performance
In-depth Eye test and Vision assessment
Eye tests and Vision assessments,
however, additionally investigate :-
our ability to identify and process information in our peripheral world,
how we control our eye movements and how these movements relate to head and body posture
our ability to converge (turn the eye in) to look at a near object such as text
the flexibility of our focusing system - can we change focus quickly (essential for copying off the board), do we have a good range of clear near vision (needed for efficient and comfortable use of computers)
how well and flexible is the system that co-ordinates the two eyes to work as a team
how well our brain is able to integrate the input from our two eyes to obtain a "stress free" single image to allow us to understand, organise and control our environment
organisation and development of the child's primitive reflexes
These assessments take about 90-120 minutes to complete - this may seem a long time for a child diagnosed or suspected of Dyslexia or ADHD, but we find most children cope very well as there are a lot of things happening and each test only taking a few minutes to complete and they are often intrigued in what we are doing.
Completing a vision assessment allows the behavioural optometrist to really understand the problems your child is experiencing and even some of the potential causes that have led to many of their problems.