Description
The Stereo Optical SL005 Random Dot Stereo Butterfly with LEA Symbols is a clinical stereotest designed to evaluate binocular depth perception in pediatric and adult patients.
Its random-dot butterfly provides three levels of gross stereopsis at 2,000, 1,150 and 700 seconds of arc. Because the butterfly is hidden within a random-dot pattern, the test minimizes recognizable monocular contours and requires binocular fusion to perceive the figure in depth. Suppression checks are also incorporated into the butterfly section.
For fine depth-discrimination testing, the booklet includes nine graded-circle levels ranging from 800 to 40 seconds of arc. The patient identifies which of four circles appears to project forward from the reference plane.
A separate pediatric section incorporates familiar LEA Symbols at 400, 200 and 100 seconds of arc, helping clinicians evaluate young children who may respond more easily to recognizable figures than to directional instructions.
The test is standardized for use at 16 inches, approximately 40 cm, with polarized 3-D viewers. Its portable booklet format is suitable for optometry, ophthalmology, pediatric vision screening and binocular-vision assessment.
Key Features
- Evaluates gross stereopsis and fine stereoacuity
- Random-dot butterfly reduces monocular contour clues
- Three gross-stereopsis levels: 2,000, 1,150 and 700 seconds of arc
- Nine-level graded-circle test from 800 to 40 seconds of arc
- LEA Symbols at 400, 200 and 100 seconds of arc
- Child-friendly symbol-recognition format
- Includes binocular suppression checks
- Suitable for pediatric and adult patients
- Standard testing distance of 16 in / approximately 40 cm
- Includes one pair of standard polarized 3-D viewers
- Answer key printed on the back cover
- Portable folding booklet for clinical use
Additional Information
- Product type: Near stereopsis and depth-perception test
- SKU / Part number: SL005
- Model: Random Dot Stereo Butterfly with LEA Symbols
- Testing technology: Polarized random-dot stereograms
- Test sections: Random-dot butterfly, graded circles and LEA Symbols
- Functions evaluated: Gross stereopsis, fine stereoacuity, binocular fusion and suppression
- Gross-stereopsis target: Butterfly
- Butterfly levels: 2,000, 1,150 and 700 seconds of arc
- Butterfly reference points: Upper-wing tips, lower-wing bottoms and abdomen tip
- Graded-circle range: 800–40 seconds of arc
- Number of circle levels: 9
- Circle levels: 800, 400, 200, 140, 100, 80, 60, 50 and 40 seconds of arc
- Circle-test format: Four-circle multiple choice
- LEA Symbols levels: 400, 200 and 100 seconds of arc
- Testing distance: 16 in / approximately 40 cm
- Viewing method: Polarized 3-D viewers
- Suppression check: Included
- Target population: Pediatric and adult patients
- Answer key: Printed on the back cover
- Manufacturer: Stereo Optical Company, Inc.
What’s Included
- SL005 Stereo Butterfly with LEA Symbols booklet
- Random-dot butterfly gross-stereopsis test
- Nine-level graded-circle test
- Three-level LEA Symbols test
- One pair of standard polarized 3-D viewers
- Answer key on the back cover
- Testing and scoring instructions
Cleaning and Care
Clean and disinfect the stereotest and viewers gently with disinfectant wipes or a soft, slightly damp, lint-free cloth. The manufacturer permits 70% isopropyl alcohol for surface cleaning. Never spray alcohol or other liquids directly onto the test or viewers.
Allow the booklet to reach room temperature before use if it has been exposed to cold conditions. Do not fold it in half. Store it in a cool, dry place because excessive heat and humidity may fade the polarized images.
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