LANG Stereotest II-R

Description

The LANG Stereotest II-R is a clinically developed orthoptic instrument for screening binocular stereovision in children and adults. The LANG Stereotest II-R is a revised version of the LANG-Stereotest® II with improved print and optical quality compared to the previous version.

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Application of the LANG Stereotest II-R

The LANG Stereotest II-R is used for the early detection of stereoscopic vision disorders. The test is suitable for patients from approximately six months of age and provides a rapid indication of binocular functional abnormalities such as amblyopia, microstrabismus, and anisometropia. The test has a proven high sensitivity and specificity for stereovision and does not require special glasses, making observation of eye movements easy.

Operation and Clinical Method

The test card uses a combination of random dots and a lenticular surface, making three-dimensional figures visible with correct stereovision. The LANG Stereotest II-R contains four test figures, three of which are only visible with intact binocular vision, and one figure that is also visible monocularly. The differences in stereo disparity are designed so that the test can demonstrate a finer gradation of stereo vision than the standard version. The test is performed at a distance of approximately forty centimeters, with the subject’s eye movements observed by a trained examiner.

Key Features

The revised version distinguishes itself by the improved optical and print quality compared to previous editions and by the presence of brief instructions on the back of the test card. The test does not require the use of polarized or red-green glasses, which facilitates its use in young children and less cooperative patients.

Clinical Relevance

The test serves as a reliable initial screening method and can help identify stereovision disorders early. A positive result indicates the ability to correctly recognize the stereoscopic figures, while a negative result indicates the need for further orthoptic or ophthalmological examination. The LANG Stereotest II-R does not replace a comprehensive stereotest examination, but it is a valuable addition to standard eye care procedures.

Technical Specifications

The test card contains four figures with varying levels of stereo disparity. It is designed for use at a reading distance of approximately thirty to forty centimeters and complies with applicable medical quality standards. The test is CE marked as a medical device and complies with European regulations for medical devices.

Lang Stereotest II-R Test Plates

• ELEPHANT 600”
• TRUCK 400”
• MOON 200”
• STAR 200” (2D, always visible)
• Reading distance: 30-40 cm (10-15 inches)
• Manufacturer Part Number: 104