Neitz CAT-CP2 Contrast Sensitivity Acuity Tester

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● In addition to daytime vision, twilight vision and glare tests are available.

● Three levels of contrast values: 100%, 25%, and 10%.

● The target is Landolt ring

● Indicator ranges can be selected by switching between NORM and WIDE

● The average brightness is constant

● Secular change of the target is less

● Measurements are with audio guide

● Measurement results can be printed out

● The patient can undergo the inspection of the contrast sensitivity with the same feeling as the conventional visual acuity test.

● Landolt broken rings are used as targets. Easy to understand for the patient.

● Fits well in a niche space.

● Compact space-saving design. Top board size 450mm x 450mm. Fits your optical bench.

Doctor’s Voice by Dr. Hiroshi Uozumi (Kitasato University, Japan)

Recently, devices with various measures to evaluate the visual performance for contrast variation have been commercialised by a lot of companies.

The compact version CAT-CP2 utilizes the principles of its predecessor CAT-2000 and inherits its selected functions.

Studies on the application of the CAT-2000 to cataract have been made 1), 2). We have confirmed its clinical efficacy at the Department of Ophthalmology of the Kitasato University 3).

The characteristics of CAT-CP2 are the use of the Landolt broken rings as targets and the unique mechanism to keep the average illuminance of the target constant at each contrast.

The Landolt broken ring consists of square wave and is well-known. The patient can undergo the inspection with the same feeling as the conventional visual acuity test. This is easy to understand for the patient and makes the inspection easier 2).

The targets are placed in the order of logarithm. It is easy to compare the visual acuity before and after the operation, and for statistical processing 3).

Furthermore, the device allows to inspect with a contrast of 25% that significant difference can be observed before and after a cataract operation. It has functions to evaluate the patient visibility in various environments, not only daylight vision, also twilight vision and burden of glare.

When choosing your device, what the important is to understand its characteristics. By evaluating the visual performance of contrast variation in the clinical settings, we expect this device will contribute to further improvement of the quality of vision of patients.

Reference

1. Visual Acuity and Contrast Visual Acuity Predicted from Cataract Type Shino Enta et al., The Journal of the Japanese Society of Cataract Research Vol 27, 68-73, 2015
2. Evaluation of a new contrast sensitivity measurement device, CAT-2000 Toshiya Lee et al., The 54th Annual Congress of the Japan Clinical Ophthalmology. Original: Japanese Journal of Clinical Ophthalmology Vol. 55 (6), 1147-1150, 2001
3. Low contrast visual acuity in CAT2000 Kaori Nogami et al., Japanese Orthoptic Journal,Vol. 32, 115-119, 2003