Evans Freeman Near Vision Unit
The NVU provides a complete subjective means of investigating the Near Vision refraction
£299.00
Description
Evans Freeman Near Vision Unit
- Freeman Near Vision Unit
- The NVU provides a complete subjective means of investigating the Near Vision refraction.
- The general appearance of the unit can be seen in the illustration.
- It is in the form of a three side drum which is LED illuminated.
- It can be held by the patient or suspended by means of a special attachment from the rod of a Refactor Head.
- The unit should be used in a room moderately lit, or with external illumination from an ordinary reading lamp.
- Side One – The Vocational Acuity Chart
The reading matter of this test is in 4 sizes of Times Roman type face, the smallest being 5 pt. - When read aloud by the patient it gives them useful information as to their standard of reading vision and what it corresponds to in every day printed matter.
- Side Two – The Binocular Bichromatic Chart
In addition to red and green filters this chart is fitted with Polarised screens. - Used without a polarising visor this chart immediately reveals accommodation insufficiency and the chromatic balancing allows the correction of presbyopia for any working distance.
- Used with the visor it is possible to check one eye against the other, then balancing the accommodation for right and left.
- Side Three – The Oblique Tangent Scale
The scale shows 14 degrees of Exophoria and 7 degrees of Esophoria in red colour. - It provides in conjunction with the green Maddox Twirl a rapid measurement of horizontal and vertical muscle imbalances.
- The Clinical Acuity Chart
This consists of a matched pair of Landolt rings graduated in size. - Accurate measurement of near astigmatism can be made with cross Cylinders.
- The Near Prism indicator
The targets, which consist of two dots placed horizontally and two arrows placed vertically about a central fixation cross, are polarised as well as being fitted with a red and green fixers. - They can therefore be separated for right to left eyes either with a polarizing visor, red/green goggles or hand frame
code 661
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