The NV-100 Near Vision Unit enables a complete refractive and binocular vision investigation to be carried out with the head and eyes in their normal posture at any working distance. The NV100 Near Vision Unit is supplied with polarising filters
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The refractive test includes:
Measurement of visual acuity using Snallen letter and illiterate E-chart, and Times Roman reading types
Accurate determination of presbyopic additions and other near corrections
Near vision astigmatism tests
Amplitude of accommodation including monocular measurements under binocular conditions
 
The binocular balance tests includes: 
Fixation disparity test for uncompensated heterophoria motor eye dominance
Quantitative evaluation of foveal suppression in heterophoria patients
Near point of convergence
Targets for subjective cover tests for heterophoria and harmonious ARC
 
Slight colour variations of the unit surround are possible.