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JVVF615 Vergence Facility Prism Flipper 6D 1.5D
Vergence Facility Prism Flipper 6D & 1.5D | Vision Therapy Tool for Optometrists, Eye Exercises & Binocular Testing | White Plastic Flipper for Convergence Training & Clinical Use
₹500.00
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Product description
- Dual Prism Powers – 6D & 1.5D for Testing: This vergence facility flipper features prism lenses of 6 prism diopters (PD) and 1.5PD, ideal for assessing binocular flexibility, vergence facility, and eye coordination. Designed for use in clinical and therapy environments by professionals and students
- Vision Therapy Tool for Convergence Training: Perfect for training convergence and divergence, this flipper helps improve visual stamina and tracking. It’s widely used in treating convergence insufficiency and other binocular vision disorders in children and adults
- Durable Plastic Body – Lightweight & Reusable: Made from sturdy medical-grade plastic, the white flipper is durable enough for repeated use in therapy sessions, classrooms, and clinics. Its lightweight design and ergonomic grip allow for smooth operation and comfort during frequent handling
| Topic | Discription |
| Purpose | This flipper is designed to test and train vergence facility—that is, the ability of the eyes to rapidly and accurately alternate between convergence (base-out prism) and divergence (base-in prism) while maintaining single vision and clarity. For example, the test might ask patient to cycle prisms until the target becomes single and clear. |
| Target users | Patients (children or adults) with binocular vision anomalies such as convergence insufficiency, divergence insufficiency, fusional vergence dysfunction, symptomatic heterophoria, asthenopia (eye strain) related to vergence anomalies. Also used by vision-therapists/orthoptists in clinic settings to assess and train vergence responses. Also useful as a screening/monitoring tool in binocular vision evaluations. For instance: “Prism flippers may be used to test vergence facility” in normative or symptomatic patients. |
| Optotypes / Symbols | The flipper device itself does not provide optotypes or symbols; rather it is used in conjunction with a visual target (for example a vertical 20/30 letter line or equivalent chart at near) that the patient looks at while the prisms are alternated. Therefore you must pair the flipper with an appropriate target (chart, letters, symbols) according to the therapy/test protocol. |
| Scaling / Spacing | Scaling and spacing (size of optotypes, spacing between lines) again is determined by the target/chart you use rather than the prism flipper itself. The flipper just places prism demand; the visual target must be sized appropriately If you plan to use the flipper for home therapy you should ensure the target size/spread is comfortable and suited to the patient’s visual acuity and attention level. |
| Range of Acuity / Line Sizes | The flipper per se does not specify a range of acuity or specific line sizes; the acuity target is part of the test protocol. For example, in the Good-Lite product description: “Perform the test at 40 cm with a target of 20/30”. So you must ensure the patient’s acuity (corrected) is at or better than the target acuity so that the vergence demand is not confounded by blur. The important factor: the flipper demand (6 PD BO /1.5 PD BI in your model) is relatively light, so it’s used for facility rather than large amplitude demands. Many therapy protocols will increase prism dioptres for training as patient improves. |
| Testing Distance | According to the product documentation: The test should be performed at near—approximately 40 cm (≈16″). It is typically used at near distance because vergence demands and facility are more easily provoked at near tasks. However, some clinics may adapt for distance facility (though less common). So ensure you use the correct distance (40 cm or as instructed) and the target is placed at that distance during testing/training. |
| Dimensions | Specific dimensions (width, height, weight) of the flipper device are not always fully published. Some basic info: For example, one product description: “Each is approx 38 mm square” for certain prism sets. The flipper handle likely holds two prisms/flips (one for BO one for BI) with a pivot/flip mechanism; the size must allow comfortable hand-flip operation and insertion in a holder or for manual use. For practical purchase: check the handle length, prism plate size, weight (to ensure easy handling), and whether it includes protective case. |
| Mounting | Typically the flipper is handheld by the examiner or patient, or placed in a “flipper holder” in vision-therapy settings. There is no “display” on the flipper itself. The visual target (chart, reading card) is what’s displayed. |
| Accessories | Specific to this model you should verify what comes in the box: The flipper device itself. Possibly a protective case or cover. Instructions for use (target distance, cycles per minute). Possibly extra prism plates or spare parts (less common). Some listings mention “Examination Tools, Flippers” but do not list accessories explicitly. |
| Durability / Material Qualities | Good quality flippers use durable optical-grade prism material (acrylic or glass) with precise prism dioptre values and minimal distortion. The handle should be robust, hinge/flipping mechanism smooth and durable, and the prism plates securely held. Markers of quality: Prism plates clear, scratch-free, uniformly polished. Handle sturdy (metal or high-grade plastic) and comfortable to hold/flip. Markings (BO/BI) clearly visible. Minimal optical aberration or edge distortion when viewing through prism. You might check if the manufacturer provides optical tolerances (±?). Some product pages mention “durable, lightweight acrylic”. For example: “Made from durable, lightweight acrylic. 15 segments… includes protective case.” (though this is for a prism bar, not flipper) Also check for warranty, availability of replacement parts, cleaning instructions (handle with care to avoid scratching prism surfaces). |
| Usability | Should be easy to flip the prism plates back and forth quickly (for e.g., 15 cycles/minute is often used as normative benchmark). Ergonomic handle that allows comfortable holding for a few minutes of testing/training. Clear markings so user knows whether they’re flipping BO or BI. Good optical clarity so target remains visible without unwanted blur except that induced by prism demand. Target instructions: easy to integrate into clinic/hometraining routine. |
| Marker of Quality | Well-known manufacturer (e.g., Good-Lite, Bernell, iAdvantec) in vision-testing equipment. Verified prism dioptre values (6PD / 1.5PD in this model) and optical quality. A device that is used or recommended in peer-reviewed studies (e.g., the research about vergence facility flippers used 12BO/3BI combinations). PubMed Good build quality and durability. Clear instructions and support documentation (especially if used in clinic). Clinical acceptance: If your orthoptist/vision-therapist endorses it, that is a positive sign. |
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