Description
Plastic
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Nylon
String
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Therapeutic
heavier cords
Product description
- The Clear Eccentric Circles – Black (1 Pair) are transparent, free-fusion cards that train vergence (convergence/divergence), stereo awareness, and anti-suppression—all without special glasses. Patients hold one card in each hand and fuse the black concentric circles into a single, “floating” target; by sliding the cards apart/together or adding slight rotation, you can increase demand, develop facility, and introduce gentle cyclofusion skills, making them a versatile staple for both clinic blocks and supervised home VT.
- What it does: Builds convergence/divergence range, facility, stereo stability, and suppression control
- How to use (quick start): Hold at ~40 cm; align the two cards; fuse the circles into one stable ring; separate (BI) or overlap (BO) to change demand
- Progressions: Start with easy spacing → increase separation for more vergence → add small rotations to train cyclofusion and fine alignment
- Feedback cues: A single, centered “lock” with depth = success; ghosting/doubling indicates loss of fusion; note break/recovery distances
- No glasses needed: Transparent design makes setup fast and patient-friendly in any room lighting
- Who it suits: Children through adults for clinic sessions and home programs under clinician guidance
- Great pairings: Brock string, barrel/dot convergence cards, RG bar reader (to check suppression), fixation stick or metronome for pacing
- Good practices: Keep posture steady, breathe/blink normally, log reps, time, break/recovery to track gains
- Care: Wipe clean with a soft, non-abrasive cloth; avoid solvents/heat; store flat to prevent warping and preserve contrast
| Topic | Details |
| Purpose | Eccentric Circles – Black (1 Pair Clear) is a binocular vision training and diagnostic tool used to evaluate suppression, binocular fusion, and fixation disparity. The device allows clinicians to observe whether both eyes contribute equally to a fused image and helps train fusional vergence (convergence and divergence) using free-space fusion without the need for prisms or additional filters. |
| Target users | The product is intended for optometrists, ophthalmologists, orthoptists, and vision therapists, as well as patients undergoing binocular vision therapy or orthoptic training. It is primarily used in professional vision therapy programs rather than general visual acuity screening. |
| Optotypes / Symbols | The visual stimulus consists of black eccentric circles (ring targets) printed on transparent cards. The central area may contain a word or fixation target (e.g., “FOCUS”) that appears clearly only when both eyes successfully fuse the images. Small alignment hash marks on the outer rings assist clinicians in detecting subtle fixation disparity or misalignment. |
| Scaling / Spacing | The device uses fixed concentric circle patterns rather than graded optotype sizes. The two transparent cards are positioned slightly apart in free space, allowing controlled horizontal disparity adjustments to challenge and train binocular fusion. |
| Range of Acuity / Line Sizes | Not applicable. The Eccentric Circles device is not a visual acuity chart and does not measure line sizes or acuity levels. Its function is focused on fusion ability, suppression detection, and binocular alignment training. |
| Testing Distance | The tool is typically used at a near working distance (approximately 40 cm) during binocular vision testing or therapy sessions. Because it is a fusion training device, it is designed primarily for near binocular coordination exercises rather than distance vision testing. |
| Dimensions | The cards are typically manufactured in approximately 6 × 7 inch transparent sheets, providing sufficient viewing area for overlapping circle targets during free-space fusion exercises. |
| Mounting | The cards are designed for free-space presentation, meaning they are held in front of the patient rather than mounted on a wall or stand. The transparent design allows the circle images from each card to overlap visually when fused. |
| Features | Key features include: central anti-suppression indicator, concentric circle fusion targets, and alignment hash marks for detecting fixation disparity. The transparent plastic design enables free-space binocular fusion, and the cards may also be used with red/green filters in certain therapy protocols to enhance dissociation training. |
| Accessories | The standard package includes one pair of clear transparent cards (one card for each eye). Additional accessories such as cases or filters are typically not included unless specified by the supplier. |
| Durability / Material Qualities | The cards are typically made from clear plastic or acetate material with printed high-contrast targets. This material provides greater durability than paper charts, resists bending and fading, and allows repeated use in clinical therapy sessions. |
| Usability / Marker of Quality | The design is simple, effective, and widely used in binocular vision therapy. Quality markers include clear printing, accurate circle alignment, durable transparent material, and precise alignment markers that allow clinicians to detect subtle binocular disparities and guide therapy progression. |
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