Neitz OT2

Neitz Anomaloscope

OT-II

Neitz OT-II

Outstanding Features:

Anomaloscope OT-II is used to detect and differentiate red-green colour vision defects.
Its more compact size (approx. 20% less than former model OT), and lighter weight (40% less), make it more portable, conserving valuable table space.
Since both light emitting diodes and interference filters are used for producing colour-mixture field (red and green) and monochromatic field (yellow), wave lengths of the three colours are constant. This is the big advantage in comparison with the method of using direct vision spectroscope.
No increase of temperature even after over periods of extended use as light-emitting diodes are used as light source. No cooling fan is needed.
High reliability of colour-mixture and monochromatic control done by the special electric circuit which controls the brightness of light-emitting diodes without a complicated slit mechanism.
Digital display of colour-mixture and monochromatic figures helps easy scale reading and avoid misreading.
Test results have been proved to coincide with those of Neitz Anomaloscope OT. (Ohta, Y, Professor of Tokyo Medical College and others: The test results of Anomaloscope obtained by use of both light emitting diodes and interference-filters. Acta Soc. Ophthalm. Jpn., 83: 12, 1989)

Specifications:

The diopter adjustment

-8D to +7D. 0 at the white line

Apparent field of view

2°10'

The upper half circle of visual field

By rotating the Colour Mixture knob, the upper half circle looks pure red, pure green, or a mixture of both coloured lights. The wave length of pure red is 671nm（±2nm ） and pure green is 546nm （±2nm ）. The ratio of amount of red light and green light is indicated by the numbers of 0 to 73 on the Colour Mixture Scale digitally.

Scale Figure	Ratio		Observed Colour
Scale Figure	Pure Red	Pure Green	Observed Colour
0	0	73	Pure Green
a	a	73-a	Greenish Yellow -> Yellow -> Reddish Yellow
73	73	0	Pure Red

The ratio of the two coloured lights can be changed continuously as shown above.

Lower half circle of the vision field

You can choose either complete dark or pure yellow by rotating the Monochromatic control knob. The wave length of pure yellow is 589 nm(±2nm). The brightness of yellow is indicated by the numbers of 0 to 87 on the Monochromatic Scale. At 0, it becomes completely dark and brightness increases when the number is getting increased. Maximum brightness is obtained at 87.

Colour Constancy

Since each colour is obtained through the interference filter, the waves of the three colours maintain constant, regardless of the Colour-Mixture or Monochromatic Scale figures.

Colour Mixture knob

Red, green, and yellow lines are indicated on the colour Mixture and Monochromatic control knobs. Change in the width of these red, green and yellow lines indicate the change in the amount of the corresponding coloured lights.

Adapter

Uses white opal glass, and as the light source a specially designed long-life bulb.

Power Source

The primary side: 100, 120, 220, 240V - 50-60 Hz. (Should be used within ±10％）

Fuse

0.5A (100V/120V)0.25A 220V / 240V)

Size

Approximately Depth 125 Width 371 Height 323mm.

Weight

Approximately 4.5kgs.

Accessories

Adapter spare bulb, Fuse, Test Chart, Dust Cover.

Back to: Neitz Refraction Room Equipment

Last Updated: 31-August-2005 11:59
Copyright © 1998-2005 Medmont International Pty. Ltd.
E-mail: webmaster@medmont.com.au

Neitz Anomaloscope

OT-II

Outstanding Features:

Specifications:

Last Updated: 31-August-2005 11:59 Copyright © 1998-2005 Medmont International Pty. Ltd. E-mail: webmaster@medmont.com.au

Last Updated: 31-August-2005 11:59
Copyright © 1998-2005 Medmont International Pty. Ltd.
E-mail: webmaster@medmont.com.au