Carleton Optical - Evans LED Near Vision Unit

Sight Testing and Refraction

Vision Screening | Evans LED Near Vision Unit

  • Evans LED Near Vision Unit
  • Evans LED Near Vision Unit

The Evans’ Near Vision Disparity Unit combines a comprehensive range of tests for refraction and ocular motor investigations at near, incorporating the latest LED illumination technology. The unit is supplied with polarisation set at either 90 x 180 degrees (for UK market) or 45 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 is much lighter than previous models and is easy to hold, especially for the young and elderly. A retractable measuring tape is incorporated within the unit and a wide range of languages is available.

Evans LED Near Vision Unit

The tests included in the unit:

  • 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