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JVVT Variable Tranaglyph
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JVVT Variable Tranaglyph

The term “JVVT Variable Tranaglyph” refers to a specific type of vision therapy device, identified by the SKU JVVT, for improving binocular vision and fusional reserves.

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Description

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Product description

  • The Variable Tranaglyph™ Kit (600 Series) is appropriate for a wide range of problems including strabismic and non-strabismic orthoptics. Fusional convergence/divergence range is from ortho to 30PD, 10.5″ x 5.5″ red/green targets are on transparent vinyl. Use with Polachrome Trainer as a cost-effective alternative to Polaroid vectograms.
  • Five pairs of variable slides, New Age red/green goggles, hand-held horizontal slide holder, two red pointers and manual.

TopicDiscription
PurposeThe Variable Tranaglyph is a vision-therapy training and assessment tool aimed at improving binocular vision, fusion, and stereopsis (the ability of the two eyes to work together). For example: “Helps build initial fusional reserves through peripheral and central fusion as well as stereopsis improving convergence and divergence skills.”
It uses red/green (anaglyph) slides so that each eye sees a different image; the patient must fuse them into a single image. The “variable” part refers to adjustable prismatic or slide displacement to increase difficulty. For example: “Difficulty can be changed by sliding both overlays away from each other. A scale shows which difficulty in prism diopters was reached.”
Typical use cases: vision therapy clinics, orthoptic/optometric offices, for patients with convergence insufficiency, divergence issues, exophoria/eso­phoria, strabismus rehabilitation, etc. For example one listing: “appropriate for a wide range of problems including strabismic and non-strabismic orthoptics.”
Target usersOptometrists, orthoptists, vision-therapists working with binocular vision disorders.
Patients who need binocular training: children or adults with reduced fusional reserves, suppressed eye, stereo deficits, exo/eso deviations.
Also for “home-therapy” versions (some kits allow patient use at home under supervision) – one description: “Effective home training slides…”
Maybe less suited for pure acuity screening (that is not its primary function) but more for binocular function.
Optotypes / SymbolsThe product uses red/green targets on transparent vinyl slides. For example: “5.5″ x 10.5″ red/green targets on transparent vinyl.”
The “symbols” are not standard optotypes (like letters, Landolt rings etc) but images or pictorial “targets” designed for fusion/training—e.g., circles, “bunny”, “clown”, “spiral” in different series.
So the user sees two overlapping images (one red, one green) and must fuse them into a single percept.
Because the slides are red/green and variable, you need red/green goggles to separate the images. For example: kit includes “red/green goggles”.
Scaling / SpacingThe “scaling / spacing” here is not like letter size/line spacing in an acuity chart. Instead, the difficulty is varied by the amount of slide displacement or prism equivalent.
The level of fusion needed is the most difficult to obtain … size 10.5″ x 5.5″” for one model.
One product: “5.5″ x 10.5″ (13.97 cm x 25.4 cm) red/green targets” for the 500-series.
Therefore, you should check the slide dimension, the displacement range/prism equivalent, and how fine the increments are (some are variable in small steps). For instance, one non-variable uses 0.25 PD increments from 0.25PD to 3.0PD.
SizeBecause the Variable Tranaglyph is for binocular fusion/stereopsis training rather than visual acuity per se, it doesn’t provide “line sizes” or a standard acuity range (e.g., 20/20 to 20/200) like a
The “range” is expressed in fusional demand/prism diopters (PD) rather than size of optotypes. For example: “Fusional convergence/divergence range is from ortho to 30PD.”
Some advanced variants (random-dot tranaglyph) require high levels of fusion and thus act like high difficulty stereo tasks.
If you need an acuity-range specification, that is not the appropriate metric here; instead ask for “fusional demand range” or “prism equivalent range”.
Testing DistanceThe distance is not explicitly standardised for all models in the listings (unlike 6 m for distance charts). However, many vision‐therapy devices are used at near distances (e.g., ~40 cm/16″) or intermediate depending on therapy setup.
The product examples specify slide size (5.5″ x 10.5″) which is convenient for near or mid-distance viewing. For example: “circles are 4-1/4″ dia.” in one spec.
Many therapy protocols using tranaglyphs mention near working distance (for example in manuals). For example in a therapy manual: “Participant views a green tranaglyph… the target is placed at near-distance, etc.”
For your clinic in India: you should ask the supplier what the recommended working distance is (often ~1 m or less) and whether slide holder supports that distance.
So: testing distance will depend on your therapy setup; confirm with kit instructions.
DimensionsFor the 500 Series: target slide size is 5.5″ × 10.5″ (≈ 13.97 cm x 25.4 cm) for each red/green target.
For the 600 Series: “10.5″ x 5.5″ red/green targets”. For the 800 Series Slides: same size, with variation.
Slide sets may include multiple slide pairs, holder, goggles, pointers. E.g., “Kit includes: Five pairs of variable slides, red/green goggles, hand-held horizontal slide holder, two red pointers and manual.” for 600 Series.
Material: transparent vinyl slides printed with red/green targets. Example: “Red/green targets on transparent vinyl”
Weight and thickness not often specified; you may want to ask for details of slide thickness, holder dimensions, storage box size.
MountingSlides are designed to be mounted in a slide holder (often horizontal) which allows sliding overlays to vary displacement. Example: “hand-held horizontal slide holder” included in kit.
Some models allow rotation (vertical/horizontal) to address lateral/vertical fusional imbalances: e.g., “Variable fusional training is achieved for either vertical or lateral imbalances by simply rotating the targets and 550 holder 90 degrees.”
Featuresred/green anaglyph targets; the slides often have overlay scales (prism diopter equivalent) printed or provided so clinician can record fusional demand. Example from VISUS: “A scale shows which difficulty in prism diopters was reached.”
Holder may have adjustable controls for slide separation, and some kits include fix-pointers or pointers for patient tasks.
Some therapy systems include a background white board behind the slides as suggested in therapy manual: “Place white background behind Tranaglyph”.
AccessoriesFor 500 Series: “(3) Variable slide pairs, Red/Green Goggles, Hand-Held Horizontal Slide Holder, (2) Red Pointers and Manual.”
For 600 Series: “Five pairs of variable slides, New Age Red/Green goggles, hand-held horizontal slide holder, two red pointers and manual.”
Extras may include multiple slide themes (bunny, clown, spiral, random-dot) for progressive training.
Some kits may include storage case/box (not always explicitly stated).
Important to check whether replacement slide pairs are available separately (some listing: “Slide pairs and Red/Green goggles can be purchased separately.”)
Red/Green goggles included (often a required accessory).
Pointers for patient to point at target elements.
Manual/guide for therapy tasks.
Optional: slide holder may need mounting (table or hand-held).
Therefore, when ordering from India consider whether shipping of accessories (goggles, pointers) is included or need separate.
Durability / Material QualitiesMaterial of slides: transparent vinyl with printed red/green targets. This is described in specs. Example: “red/green targets on transparent vinyl”
The physical holder should be durable plastic/metal for repeated clinic use. While specs seldom detail brand durability, you should check for rigid slide holder, smooth sliding action, minimal play in mechanism.
Accessories (goggles, pointers) should be durable for therapy sessions.
Since these are used in clinics or therapy settings, materials should resist frequent handling, slide changing, cleaning, and storage.
One key quality: the overlay/slides must maintain accurate alignment and displacement ranges over time (wear and tear can lead to imprecise training).
The published manual: “Variable sliding trainer … can be used as cost-effective alternative to Polaroid vectograms.”
drishtiventure.com
Marker of good durability: crisp print quality (no peeling), non-warped slides, clear red/green separation (no colour bleed), strong holder mechanism, accessories comfortable and long-lasting.
For procurement in Indian setting: ask for warranty or replacement slides, check condition on arrival, store in protective case to avoid damage.
UsabilityA good Variable Tranaglyph kit allows the clinician to easily adjust difficulty (slide displacement/prism equivalent) thereby customizing therapy to patient’s current ability and progression.
The red/green goggles must fit comfortably on the patient, and the slides/holder must be easy to operate to avoid time-loss in sessions.
Clear visual targets (circles, shapes) that can be engaged by patient (e.g., pointer tasks) help maintain interest, especially in children.
Multiple slide themes (bunny, clown, random-dot) increase engagement and allow progression from easier to harder levels
The design allowing both horizontal and vertical/oblique targets (especially 800-series) increases applicability for a wide range of binocular vision issues.
Ease of scoring/tracking: if the device includes a scale (prism equivalent) you can record patient performance and track progress.
Home-therapy capability: if kit is designed for home use (as some state “effective home training slides”), it enhances usability outside clinic.
Marker of QualityPrecision in manufacturing: accurate slide alignment, smooth movement, reliable scale markings.
Good material quality: transparent vinyl slides that don’t scratch, fade or distort; strong holder mechanism.Comprehensive accessory kit: goggles, pointers, slides, manual, storage case.
Support and availability of replacement slides/accessories. If the manufacturer or supplier allows purchase of additional slide pairs separately, that indicates good quality ecosystem.
These have longstanding reputation in vision therapy tools.
Flexibility: ability to address a range of fusional demands, both horizontal & vertical. A kit with just horizontal is less flexible. The 800 Series covers both horizontally and vertically.
Good print clarity, red/green separation quality (for anaglyph method)—poor print can reduce efficacy.
Clear instructions/manual and therapy protocols included.
Good user feedback (clinic users reporting effective binocular gains) – although not always published, you may ask for testimonials or case studies (see therapy manual examples for tranaglyph usage).

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