POLA VistaVision is an advanced refraction system that let the optical experts to accomplish the most accurate examination for a prescription aimed at obtaining the best performances in the binocular vision test.
The performance in a normal light setting of the binocular optotype with positive polarization (black on white background, as the monocular optotypes) makes more true user’s answers under examination tests, essential requisite to carry out the most accurate check of the binocular vision quality.
The instrument consists of an LCD polarized monitor with a 22” antiglare wide screen and with calibrated, uniform and certified luminance. Stereo sound is available. Image separation, the outcome of the most innovative polarization techniques, completely removes ghost images.
Linux Embedded System guarantees the best software stability and all the data are saved in a flash memory to avoid their lost or damages. Moreover, an electronic board, that consumes no more than 4W, ensures the lowest heating and the lowest noise, as well as the highest durability (without any fan or mobile tool). Regular software updates are available on-line, may be downloaded and executed through a USB flash drive, free of charge. Either wall assembly or on turntable are provided.
The basic software, developed thanks to the cooperation of ophthalmologists and optometrists, has been further updated according to the most officially recognized refraction techniques.
In view of the fact that the monitor itself is polarized, polarized tests do not require any additional screen. Further, polarization may be electronically reversed, using the remote control.
POLA VistaVision is a multiuser refraction unity: hence, every user (up to a maximum of three) may select desired types of examination. Four types of examination are available for each user: conventional, child, low vision, individual. Every user may customize the desired type of examination.
Examination distance may be set up between 2 and 8 mt. (with a 5 cm step) and the optotypes may be displayed either in direct or indirect vision (through a mirror). The screen luminance may be set up, as high or low, according to the brightness of the setting.
Monocular optotypes, without limits of displaying.
Visual Acuity value may be selected among 17 scales (decimal logarithmic acuity, 20ft, 6m, /10, LogMar, etc.). Visual acuity values are available between 0,03 and 1,6. Optotypes may be displayed either as lines of different visual acuity with fixed or proportionally decreasing space, as lines of equal acuity, as single horizontal or vertical line, or as single optotypes. Moreover, random functions and variations in contrast may be performed (13 different levels according to LogSC scale). It is possible to add the red-green shape to all previous optotypes displays.
New tests for new examination types or sequences.
POLA VistaVision includes: a child examination provided with specific tests, not only for the estimation of the visual acuity, but also for the balance of refraction, phorias and ductions; a low vision examination that offers, in addition to the tests of preliminary examination, three EDTRS tables for 1 or 2 mt., the tests for the estimation of the spherical and cylindrical compensation, the tests to check the binocular vision and the balance of refraction, suitably enlarged for a 2mt. distance of examination, the Amsler tests, Ishihara color vision test, and Contrast Sensitivity tests. Finally, it is provided a specific sequence for the check of binocular vision quality trough MKH methodology (Haase evaluation and correction method). This is a sequence of tests aimed at determine the prescription to obtain the best performances in the binocular vision.
“MKH methodology consists of specific polarized tests with peripheral, paracentral or central fusional stimuli which are seen by both eyes, while, on the contrary, other particular tests are seen by each eye separately and cannot be merged.
The MKH investigates on angular ametropia, a normal binocular vision status, (associated to the fusion and not dissociated, by prism i.e.), that occurs with a lateral error of image position in order to reduce the energy consumes. While heterophoria represents an artificial condition owing to the break of the fusional stimulus (dissociate phoria), in the natural condition the visual system uses a proportional compensation of the error of the image position (associated phoria).
MKH method, estimating the value of the associated phoria, let obtain a complete correction of the angular ametropia through an optical binocular prescription, or prismatic, if necessary, in order to accomplish a perfect bifoveale vision with the highest stereopsis value. According to this school of thought, performing the MKH method is of great importance either for those who apply strictly the dictates of Haase school or for those who, even though professionally grown in another school of thought, prefer to propose a calculated spherical version and/or a cycle of Visual Training, as an alternative to the prism test.
Other tests… and even more
POLA VistaVision also consists of 15 stereo anaglyphic tests to be performed with Red/Green glasses. Moreover, it includes several contrast sensitivity tests, one of those uses a psycho-physical sequential procedure, or “fast 2-1”, that reproduces in a graphic the findings of 144 stimuli, 3 random inclinations, 8 contrast levels, 6 spacial frequences levels (between 0.75 and 18 cycles/grades). A printable version of this graphic is available.
Finally, Ishihara tables, consisting of 25 tables calibrated as regards luminance, contrast and saturation. Multimedia windows let to access to an instructive cartoon for children, to display some tables explaining eye anatomy, diseases and therapies and to display some personal images and movies (slideshow).
In addition, POLA VistaVision offers BlueKit, a wireless connection kit to the digital phoropter (now available for the following refraction systems: Huvitz HDR-7000, Huvitz CDR-3100, Indo eDR-10, Potec PAV-6100 and Unicos UDR-700) and PolaTrolley, granting a safe transport everywhere.