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JVMBY Marsden Ball Yellow
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JVMBY Marsden Ball Yellow

A basic vision therapy tool no vision therapy practice should be without. Improved Marsden Balls now have a better weight which offers a better swing.

₹500.00

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SKU: JVBS510-1-1-1-1-1-3-1-1-1-1-1-1-1

Description

Plastic

Beads

Nylon

String

Beads

wood

Therapeutic

heavier cords

Product description

  • A basic vision therapy tool no vision therapy practice should be without. Improved Marsden Balls now have a better weight which offers a better swing.
  • The Marsden Ball is available in 3 different versions: Hard Plastic, Soft White Vinyl and Soft Yellow Foam.
  • The White Hard Plastic Economy marsden ball is 3″ hollow ball made of hard plastic with black letters on a 10’ cord.

TopicDiscription
PurposeThe Yellow Marsden Ball is designed for ocular-motor/visual-motor training, including pursuits, saccades, tracking moving objects, hand-eye coordination, binocular vision integration (when used with appropriate filters) and overall visual-motor rehabilitation.
Target usersPatients (children or adults) with binocular vision problems (e.g., amblyopia, strabismus), visual-motor coordination difficulties, poor tracking, hand-eye integration issues, and also for general vision therapy or developmental therapy. The Yellow ball version is intended “suitable for patients … everyone can use it, children as well as adults.”
Optotypes / SymbolsThe ball has letters and numbers printed on its surface. For example: “printed black letters and numbers on a 10 foot cord.”
These letters/numbers act as visual targets during motion (ball swinging) so the patient must visually track and read or call out letters/numbers, thereby integrating tracking + recognition.
So the “optotypes” are the letters/numbers on the ball, but note: they are not standardized acuity charts — they serve as moving discrimination targets rather than formal visual acuity lines.
Scaling / SpacingThe printed letters and numbers appear at various positions around the ball’s surface; the spacing is irregular because of curvature and movement of the ball.
Specification example: “Yellow Foam Marsden Ball is 3.25 inch with printed black letters and numbers on a 10 foot cord.”
Another (European version) says: “Soft sphere … Ø 70 mm … rope length 6 m.”
Therefore the “scaling/spacing” of the symbols is less formal than static charts — the key is that the size is large enough to be legible at the distance the ball swings.
If using for children/adults, you will want the letters reasonably large (e.g., visible size ~6–12 mm depending on viewing distance) so the tracking + recognition is feasible.
SizeThe Marsden Ball itself is not a standardized acuity chart with line sizes (e.g., 20/20, 20/40). The items printed are letters/numbers for recognition/tracking rather than formal acuity measurement.
So the “range of acuity” in a strict sense is not specified by the ball; the ball is used in tandem with training/therapy tasks, not primarily for acuity measurement.
If you wanted to use it for grading difficulty you could vary the letter size or swing distance to adjust demand, but that would be a custom setu
Testing DistanceThe ball is intended to be suspended and swung so that the patient tracks the ball as it moves. For example the spec says “10 foot cord”.
Another spec: rope length 6 m (≈ 20 ft) for certain European version.
The actual “testing distance” is therefore dynamic: the ball is swinging perhaps at arm’s length or further, depending on mounting height. The key is that the patient’s eyes must follow the ball across space.
You should ensure you have adequate space: a clear area around the swing path, height of mount so the ball swings in the patient’s eye‐level or comfortable height.
If the ball is used at near or mid‐distance, adjust accordingly; many therapy protocols have the ball in near-field (within a meter or two) for tracking tasks rather than 6 m away.
DimensionsFor the Yellow version: “3.25″” ball (≈ 82.6 mm diameter) with printed letters and numbers.
The Good-Lite spec lists: “Yellow Foam Marsden Ball is 3.25 inch with printed black letters and numbers on a 10 foot cord.”
Another version lists: “Ø 70mm” for a soft sphere with rope length 6 m.
So typical diameter ~70–83 mm (~2.8–3.3″). Cord/rope length: ~10 feet (≈3 m) in U.S. version; up to ~6 m in other markets.
Weight is not always specified, but material versions (foam vs vinyl) will vary. The spec for “soft sphere … weight 90 g” for a 70mm version.
utstyrsavdelingen.no
Ensure the ball size is appropriate for your therapy space and patient.
MountingThe ball is supplied with a cord/rope (e.g., 10-foot cord) so you suspend it from a hook/ceiling or have a holder/trainer hold the rope. For example: “attached to a 10 foot cord.”
FeaturesThe ball itself is the target; there is no electronic display. The letters/numbers on the surface act as the visual target.
Some versions mention “includes hook” or “anti-twist string + hook” (European version).
Good mounting should allow smooth swinging, safe clearance, eye-level placement. The therapy instructions typically: “Attach the Marsden Ball to the ceiling or have someone hold the rope in the air so the ball is swinging in the height of the patient’s eyes.”Check that you have space and proper mounting hardware, that the rope is secure, free of tangles, and safe.
AccessoriesThe product page lists Package: “Yellow Marsden Ball *1, Rings *2” (rings presumably for mounting).
For European version: set includes “stickers set to customise the ball with letters – polyurethane soft material with anti-twist string + hook”.
So accessories may include mounting rings/hooks, rope/cord, possibly adhesive letter stickers (for customising ball) depending on variant
Ensure you have the mounting hardware (hooks/rings), the cord length is sufficient, and any extras (instructions, therapy manual) if required.
Durability / Material QualitiesThe product is described as foam sphere for some versions. For example: “Soft sphere … foam sponge” for the yellow version.
Other descriptions suggest a “hollow ball made of durable vinyl” (for white version) but for the yellow version the spec emphasises foam. However Good-Lite spec: “Yellow Foam Marsden Ball is 3.25 inch … printed black letters … on a 10 foot cord.”
Usability / Marker of QualityLetters printed clearly and robustly (not fading)
Cord/rope sturdy (anti-twist, secure mounting)
Ball material resilient to repeated swings/therapy sessions
Safe for children (if used with children)
One listing states: “Improved Marsden Balls now have a better weight which offers a better swing.”
So check that your version has correct “weight” for swing (too light may flick too easily, too heavy may be unsafe), good build quality, and mounting hardware safe.

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