Near Vision Unit

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Telephone: (01842) 766004



The Evans Near Vision Disparity Unit combines a comprehensive range of tests for refraction and ocular motor investigations at near. The unit is supplied with polarisation set at 90 degrees x 180 degrees (for UK market) and 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. A retractable measuring tape is incorporated within the unit.


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

Cat. No. 660 Evans Near Vision Unit