Description
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Product description
- The Stereopsis Butterfly Test is a simple, near stereo-acuity test designed to demonstrate and assess gross stereopsis (depth perception) in an immediate, intuitive way. Using a large, high-contrast butterfly that appears to “float” in depth when viewed binocularly (with polarized glasses), it helps clinicians quickly confirm whether both eyes are working together—making it especially effective for children, first-time patients, and screenings where speed and engagement matter.
- What it measures: Gross stereopsis—the presence of binocular depth perception
- How it works: A prominent butterfly image viewed with polarized glasses appears raised only with true binocular vision
- Why it’s effective: Instant, visual “pop-out” makes results easy to understand for patients and parents
- Ideal for kids: Large, attractive target improves cooperation in pediatric and low-attention patients
- Clinical use: Rapid screening for binocular vision, amblyopia, and strabismus (presence/absence of stereopsis)
- Best role: Initial stereo screening or demonstration before moving to finer stereo-acuity tests
- Settings: Pediatric ophthalmology/optometry clinics, VT practices, school vision screenings
- Care: Keep plates clean and flat; protect from scratches; ensure polarized viewers are in good condition for accurate results
| Topic | Details |
| Category | Stereo Acuity Test / Pediatric Ophthalmology |
| Product Name | Stereopsis Butterfly Test |
| Purpose | Used to assess stereopsis (depth perception) and screen for binocular vision disorders such as amblyopia, strabismus, and suppression. Provides both gross and fine stereopsis evaluation. |
| Target Users | Optometrists, ophthalmologists, orthoptists, pediatric eye clinics, vision therapists, and screening programs for children and adults. |
| Test Principle | Based on polarized stereopsis testing, where each eye is presented with slightly different images to create a perception of depth when viewed through polarized glasses. |
| Optotypes / Symbols | Includes butterfly figure (gross stereopsis), animal shapes (for children), and graded circles for fine stereopsis measurement. Designed to be engaging and easy for pediatric patients. |
| Stereoacuity Range | Measures stereopsis from gross disparity (~2000–3000 arc seconds) down to fine stereopsis (~40 seconds of arc) depending on model/version. |
| Test Components | Butterfly figure (gross stereo), Animal series (pediatric-friendly), Graded circle test (fine stereo acuity), Stereo plates/booklet format. |
| Monocular Clues | Designed to minimize or eliminate monocular cues, ensuring true binocular depth perception is measured. |
| Testing Distance | Typically performed at near distance (~40 cm / 16 inches) using polarized glasses. |
| Material | Printed stereo plates on durable card/vinyl material, often with protective coating. Includes polarized plastic glasses. |
| Physical Size & Dimensions | Booklet size typically around 6.5″ × 8.5″ (≈16.5 × 21.5 cm) depending on manufacturer. Portable and easy to handle. |
| Mounting / Display Features | Handheld booklet format; used at near distance. No wall mounting required. |
| Included Accessories | Polarized glasses (adult and/or pediatric), test booklet, answer key (usually printed on back), instruction manual. |
| Durability | Designed for repeated clinical use. Durable pages but should be protected from bending, scratches, and excessive heat. |
| Usability | Easy to administer, especially for children. Does not require reading ability. Quick screening tool for binocular vision and stereopsis. |
| Marker of Quality | Widely used and clinically accepted stereopsis test. Good quality versions offer clear polarization, accurate disparity levels, and durable print quality. |
| Clinical Applications | Screening for amblyopia, strabismus, binocular vision disorders, pediatric vision testing, vision therapy baseline and monitoring. |
| Limitations | Requires proper use of polarized glasses. Some versions may still have minimal monocular cues. Fine stereo levels may be difficult for patients with binocular dysfunction. |
| Storage | Should be stored in a protective case, away from heat, moisture, and direct sunlight to maintain polarization and print quality. |
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