Patient Calibration with Equal-Eyes Pro
Patient Calibration
Most strabismus sufferers, suffer a condition where the eye positions are not being synchronised by the brain. Equal-Eyes Pro (EE-Pro) addresses that by providing several methods to present to your eyes. Images that can provide apparent synchronisation. This is an important step in starting the process of steroescopic fusion of your vision.
There are several scenes varying in complexity of data from simple ie for a child to detailed for a veteran user.
It is first important to add any amblyopia correction. This can be achieved by altering the brightness and / or focus of the Good Eye so that both eyes perceive a similarly matched image in both terms of brightness and bluriness (focus).
Method one is a Simple scene which comprises of two grey squares. For normal vision. the smaller grey square should appera perfectly alingned and fitted to the large grey hollow square. However, it's more than likely that the left image is what appears.
A child can use the controls to re-align the small square to the large square to provide the image shown to the right.
Although is may not be precise. It is a way to get your child on the way to fixing his or her gaze.
Method two is a little more advanced but can provide good precision but may be a little challenging for a child.
It utilises two similar targets and a central ball. This technique can provide a good Patient to Headset calibration. It does however lack any real-time detail.
Below are the typical steps in calibrating from No-Alignment through to good alignment. The order is based on patient preference. Show is, Torsional Correction first, then Vertical and Horizontal second.
Method three uses a simplified Target, but as there is less detail in the target less confusion prevails. The precision can be a little better than above and should be used by the more proficient patient.
It utilises two similar targets and a central ball. This technique can provide a good Patient to Headset calibration. It does however lack any real-time detail.
Again, below are the typical steps in calibrating from No-Alignment through to good alignment. Shown is, Torsional Correction first, then Vertical correction and then Horizontal correction and finally tweaking of the tweaking of the Vertical.
The Final and preferred method again uses a simplified Target, Also provided are guide graduation for H, V and Torsional Alignment. The patient can switch between torsional and HV scenes to finally come up with the perfect calibration. The graduation can provide useful feedback to the user as to how far out their vision is in real-time during the adjustment.
The final two images shows both H & V alignments as well as torsional alignment all in perfect calibration.
It is important to note. Whilst the calibration may be correct on an instance of going through the steps, due to the lack of fusion most amblyopes initially have. The next time the patient comes back to this setup/calibration scene, the images may have shifted slightly. This is normal and only longer term exercising will provide the 'Target Locking' of both eyes required for perfect convergence.
Once calibration is complete, you return to the calibration menu by pressing the context button on the left hand controller. This will bring you here.
The Head Up Display Menu also provides you with guidance on using the controllers and details the settings for each axis including the general Dominant Eye Brightness and Blur amounts.
The Target distance is equivalent to 65 metres. The display provides an optional degree of error at 1m for the Vertical as this is generally a very small value and the 1m distance provides a more granular measurement. The Horizontal Assist displays the degrees at 65m and Prism Diopters at 65m and 1m.
The Prism Diopters @ 1m for Horizontal is generally the value used by Optometrists.
Equal-Eyes Pro Clinic Application
