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JVECB Eccentric Circles Black 1 Pair Clear
Fixation disparity check. Small hash mark on the top of the outer ring on one card, and on the bottom of the ring on the opposite card to help improve accurate alignment and help reduce fixation disparity.
₹500.00
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Product description
- Central anti-suppression check. The word FOCUS is seen by both eyes.
- Fixation disparity check. Small hash mark on the top of the outer ring on one card, and on the bottom of the ring on the opposite card to help improve accurate alignment and help reduce fixation disparity.
| Topic | Discription |
| Purpose | A central anti‑suppression check and fixation disparity / alignment tool. The device allows assessment of suppression (i.e. whether one eye’s input is suppressed) and fine alignment (disparity) under binocular conditions. (From product description) Also used in vision therapy to train fusional vergence (i.e. convergence/divergence) by free‑space fusion without needing prisms or filters. |
| Target users | Optometrists, orthoptists, vision therapists, and their patients. It is not a screening chart for general public but a tool for binocular vision / therapy work. |
| Optotypes / Symbols | The “optotypes” are circles / rings (eccentric circles). Two cards with printed black concentric (or near‑concentric) circles. In the central region there is also a word (e.g. “FOCUS” in black‑clear variant) intended to appear to both eyes if fusion is successful, serving as an anti‑suppression check. There are also small hash marks on the outer rings (one on top of the outer ring in one card, and on the bottom in the mtching card) to aid in precise alignment / reduce fixation disparity. |
| Scaling / Spacing | The circles are printed on two separate clear acetate (or clear plastic) cards. There is no mention of a stepped scaling of circle sizes (unlike acuity charts). The design is more about matching the circles (fusion) rather than graduated sizes. The spacing between the two cards in free space allows slight horizontal disparity (i.e. you shift the cards relative to each other to challenge fusion) but the spec does not quantify typical spacing increments or step sizes. |
| Range of Acuity / Line Sizes | Not applicable (or low relevance) because this is not a visual acuity chart with multiple lines. Its function is binocular fusion / suppression, not measuring high/low acuity levels. The circles are of fixed size as printed, not graded in many line sizes. |
| Testing Distance | The test is performed in free space, at a near working distance (i.e. the cards are held in front of the patient at near, within convergence range). In many vision therapy setups, free space fusion tools like these are used at ~40 cm or similar near distances. (Though I did not find a specific distance listed in the public spec for this product.) Because it’s a near / fusion tool, it’s not designed for far distances (e.g. 6 m) but for near binocular coordination. |
| Dimensions | One general variant: the “Eccentric Circles” product is described as two 6″ × 7″ clear acetate cards. For the “Black Clear” variant, the product listing states it’s offered in “clear plastic” and mentions variants. but does not explicitly restate dimensions in that snippet. |
| Mounting | These are free‑space fusion cards, meant to be held or presented in front of the patient, not wall mounted or projected Because they are on clear acetate / plastic, they might be used with backlighting or against a neutral background, but the spec does not mention built‑in illumination. |
| Features | Anti-suppression check: The central “FOCUS” word is visible to both eyes when properly fused. Fixation disparity check: The hash marks on outer rings help detect / train precise alignment / disparity correction. Some versions allow convergence / divergence training when used with red/green filters (in variants such as red/green eccentric circles) by swapping which card is on which side relative to color filters. Because it’s clear plastic, you can see through the material, allowing overlapping images and fusion. |
| Accessories | The standard package is just a pair of clear cards (one for each eye) — “1 Pair Clear” variant. |
| Durability / Material Qualities | Clear plastic / clear acetate / clear vinyl (depending on variant) is used to allow free‑space overlapping of images. Because it’s a simple card, durability is moderate — the plastic / acetate should resist bending and fading better than paper, but frequent use, scratching, or stress may degrade alignment marks. The clarity of printing (sharp edges, contrast) is important for performance. The fact that Good‑Lite offers a plastic clear variant demonstrates a quality upgrade over paper. |
| Usability / Marker of Quality | Ease of use: Straightforward — place cards in front of eyes, ask the patient to fuse.circle images, see the central word, adjust position until alignment is achieved. Because it’s a simple device, minimal training is needed for basic use. Precision: The inclusion of small hash marks is a marker of a more precise design, allowing therapy to detect small fixation disparity Flexibility for therapy: Because these are free‑space cards, they allow more natural fusion training vs forced dichoptic setups, which is considered beneficial in therapy settings. Limitations: The lack of quantified steps, lack of variant sizes, and absence of an embedded frame or mount means the therapy depends more on operator discipline and consistency. Also, without protective casing, wear over time may reduce accuracy. |
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