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Prism Bar Sets Horizontal and Vertical
These sets are used by professionals to measure and improve conditions like strabismus (eye turn) and phorias, which are deviations in the alignment of the eyes
₹500.00
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Description
Plastic
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String
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wood
Therapeutic
heavier cords
Product description
- Vision Assessment: They are used in tests like the prism cover test to measure the amount of eye deviation.
- Binocular Vision Therapy: They help patients practice and improve the way their two eyes work together (binocular vision) and to develop better depth perception (stereopsis).
| Topic | Discription |
| Purpose / Target Users | Purpose : The Reversible Prism Bar Set is used to measure ocular deviations, evaluate fusional vergence ranges, and perform binocular vision therapy. Horizontal prism bar: measures base-in / base-out deviations (for esophoria, exophoria, convergence, divergence). Vertical prism bar: measures base-up / base-down deviations (for vertical phoria or hyper/hypotropia). “Reversible” indicates that the base direction can be flipped easily to switch between in/out or up/down without changing tools. Target Users:Optometrists / Ophthalmologists Vision therapists / Orthoptists Students in optometry or orthoptics training Patients during eye alignment assessment or therapy sessions |
| Optotypes / Symbols | The prism bars are used in conjunction with fixation targets or visual optotypes. Common optotypes: letters, symbols, or objects viewed at near or distance (e.g., Snellen chart, Worth four-dot, or fixation light). The prisms shift the image seen by one eye, allowing measurement of the prism power that aligns the visual axes for fusion. |
| Scaling / Spacing | Each bar has stepwise scaling of prism diopter (Δ) power. Horizontal bar range: typically 1Δ to 40Δ (in incremental steps: 1Δ, 2Δ, 3Δ, 4Δ, 5Δ, 6Δ, 8Δ, 10Δ, 12Δ, 14Δ, 16Δ, 18Δ, 20Δ, 22Δ, 25Δ, 30Δ, 35Δ, 40Δ). Vertical bar range: usually 1Δ to 20Δ (with smaller incremental changes). Even spacing: Each prism is evenly mounted on the bar with clear laser-etched markings for accurate reading and easy visual identification during testing. |
| Range of Acuity / Line Sizes | Not directly related to acuity; compatible with any visual acuity chart or symbol. Optical clarity ensures that even fine acuity targets (20/20 or better) remain clear and undistorted through any prism power. |
| Testing Distance | Near testing: at 33–40 cm for near phoria and convergence range. Distance testing: at 6 m (20 ft) for distance deviations. The same bar can be used at both distances, depending on the fixation target setup. |
| Physical Size & Dimensions | Each prism bar typically contains 8–20 prisms in a fixed array. Approximate dimensions: Horizontal Bar: 18–22 cm long × 2.5–3 cm wide × 1.5 cm thick Vertical Bar: 12–15 cm long × 2.5 cm wide × 1.5 cm thick Weight: Around 100–200 grams per bar depending on material (acrylic or glass). Ergonomic handle or grip provided for clinician comfort during prolonged testing. |
| Mounting / Display Features | Handheld, reversible design: The base direction can be flipped easily for opposite testing directions (IN/OUT, UP/DOWN). Each prism is firmly mounted and aligned precisely on the bar to maintain optical accuracy. Laser-engraved markings or printed diopter values next to each prism. Some models include color coding or dual-ended bars (base-in one side, base-out the other). |
| Included Accessories / Extras | Typically supplied as a set of two bars: One horizontal prism bar One vertical prism bar……Protective case or pouch lined with foam or velvet for safe storage. Some sets include calibration certificates or instruction manuals for clinical use. Optional handle attachments or mounting stand (in premium models). |
| Durability / Material Qualities | Materials : Optical-grade acrylic (PMMA) or optical glass prisms Frame or body made of rigid plastic or aluminum for stability. Finish : Highly polished prism surfaces ensure clarity and minimal chromatic aberration. Edges are smoothed to prevent injury and chipping. Durability : Resistant to scratches and optical warping Acrylic versions: lightweight, shatter-resistant (safer for pediatric/field use) Glass versions: higher optical precision and longer-lasting clarity |
| Usability / Marker of Quality | Usability : Easy, one-hand operation for clinicians Clear labeling for quick identification of prism power Smooth reversible handling for fast base direction changes Lightweight and ergonomically balanced for stability during testing Compatible with various tests (cover test, Maddox rod, fixation disparity, fusion range evaluation) Markers of Quality: ISO / CE certification for optical instruments Accurate prism calibration (within ±0.25Δ tolerance) Distortion-free optical clarity across full range Precision alignment of prisms on the bar Secure mounting and strong construction to prevent loosening over time Inclusion of protective storage case |
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