The Near Vision Disparity Unit combines a comprehensive range of tests for refraction and ocular motor investigations.
 
The unit is supplied with polarisation set at 90 degrees x 180 degrees (for UK market) or 45 degrees x 135 degrees (for export or use with a refractor head). 
 
The unit is rechargeable, incorporating the latest charging circuitry and is recharged via a plug-in power supply.
 
The new casing has a much smaller footprint to previous models, standing upright on the desktop, and a retractable measuring tape is incorporated.
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The tests incorporated in the unit are as follows:
Fixation disparity test
Polarised foveal suppression test
Polarised test for arc & suppression in strabismus
Polarised bichromatic test
Polarised cross cylinder target & visual acuity balance test
Measurement of monocular amplitude of accommodation under binocular conditions
Stereopsis test
Tangent scale & spotlight
N5-N12 Times reading fonts
Dominant-eye & accommodation convergence relationship test
Visual acuity charts (both letter & E) in decimal notation
Near point convergence