We recently published a paper looking at a new method of assessing fixation disparity using the Hoya EyeGenius (Optician 17.02.17) and I have arranged a trial of the binocular vision assessment system later in the spring.
While organising this, I have discovered that the EyeGenius is complete and comprehensive electronic display system, and much more than just a fixation disparity unit.
The unit
The unit comprises a distance target screen (either standalone or wall mounted – figure 1), a near target screen and a tablet (figure 2).
A further adaptation is possible to test the impact of glare on distance vision. The Light Kit consists of two light sources that are attached to either side of the distance display screen (figure 3) and help assess the impact of extraneous light sources upon distance acuity. This is a legally required measurement for drivers in some European countries.
Figure 1
The distance chart is controlled through the tablet and has four main display options:
- Measurement (Refraction)
- Function
- Binocular Examination
- EyeGenius Fixation Disparity Examination
Table 1: Distance tests
The unit is for six-metre viewing, either directly or through a mirror, though may be calibrated for shorter distances where necessary. Table 1 summarises some of the key tests available on the distance chart.
Figure 2
Figure 3
The battery of tests available on the near unit is summarised in table 2.
Table 2: Near tests
There are also a host of videos, both educational and for improving fixation and co-operation in younger patients.
Flexibility
We will be publishing results of our trial of the EyeGenius as a means of assessing fixation disparity later in the spring. In the meantime, the scope of this new technology as a flexible and adaptable electronic vision testing systems might not yet be fully realised. The EyeGenius is certainly much more than a just single binocular vision assessment technique.
Further information from www.hoya.eu