Description
The Stereo Optical SL001 Stereo Fly Stereotest with LEA Symbols is a clinical screening test designed to assess stereoscopic vision and the ability of both eyes to perceive differences in depth.
The large house-fly image provides a simple evaluation of gross stereopsis, making the test accessible to young children and patients who may have difficulty understanding complex instructions. When binocular stereopsis is present, the fly appears three-dimensional and elevated from the page.
For more detailed assessment, the booklet includes a graded-circle section that measures fine depth perception from 800 to 40 seconds of arc. It also incorporates internationally recognized LEA Symbols—house, apple, square and circle—for evaluating children at levels of 400, 200 and 100 seconds of arc.
The test is standardized for use at 16 inches (approximately 40 cm) with polarized 3-D viewers. Its three complementary sections make it suitable for optometry, ophthalmology, pediatric vision screening and binocular-vision evaluation.
Key Features
- Evaluates gross stereopsis and fine depth perception
- Large Stereo Fly target for an intuitive gross-stereopsis assessment
- Gross-stereopsis range of 355–700 seconds of arc
- Graded-circle test from 800 to 40 seconds of arc
- LEA Symbols at 400, 200 and 100 seconds of arc
- Child-friendly house, apple, square and circle symbols
- 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 booklet for clinical use
Additional Information
- Product type: Near stereopsis and depth-perception test
- SKU / Part number: SL001
- Model: Stereo Fly with LEA Symbols
- Test sections: House Fly, graded circles and LEA Symbols
- Testing technology: Polarized stereoscopic targets
- Visual functions evaluated: Gross stereopsis, fine stereoacuity and binocular depth perception
- Gross-stereopsis target: House fly
- Gross-stereopsis range: 355–700 seconds of arc
- Graded-circle range: 800–40 seconds of arc
- LEA Symbols range: 400–100 seconds of arc
- LEA Symbols levels: 400, 200 and 100 seconds of arc
- Symbols used: House, apple, square and circle
- Testing distance: 16 in / approximately 40 cm
- Viewing method: Polarized 3-D viewers
- Target population: Pediatric and adult patients
- Standard 3-D viewers included: 1 pair
- Answer key: Printed on the back cover
- Manufacturer: Stereo Optical Company, Inc.
What’s Included
- Stereo Fly with LEA Symbols stereotest booklet
- House-fly gross-stereopsis test
- Graded-circle stereoacuity test
- Three-level LEA Symbols test
- One pair of standard polarized 3-D viewers
- Answer key on the back cover
Cleaning and Care
Gently clean and disinfect the stereotest and 3-D viewers with disinfectant wipes or a soft, slightly damp, lint-free cloth using 70% isopropyl alcohol. Never spray alcohol or other liquids directly onto the surfaces.
Allow the booklet to reach room temperature before use when it has been exposed to cold temperatures. Do not fold it in half. Store it in a cool, dry place away from excessive heat and humidity.
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