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Prism Loose and Horizontal and Vertical Prism Bar Set
vision-related issues by testing how the eyes react to shifting the image. The sets are available in various materials like acrylic
₹500.00
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Description
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Product description
- Horizontal and vertical prisms: These are the core components, used to shift an image both horizontally and vertically.
- Loose prisms: These are individual prisms that can be used independently, often to correct a specific prescription in one eye or for other specialized uses.
| Topic | Discription |
| Purpose / Target Users | Purpose : Designed for binocular vision assessment and therapy. Measures ocular deviations (phorias, tropias) and evaluates fusional vergence ranges (convergence/divergence, vertical vergence). Used to test ocular motility, suppression, diplopia, and prism adaptation. Essential in vision therapy, orthoptic exercises, and strabismus diagnos Target Users : Optometrists and ophthalmologists. Orthoptists and vision therapists. Clinical optometry educators and students. Used for both adults and pediatric patients. |
| Optotypes / Symbols | The prisms are accessories used in conjunction with optotypes or visual targets, such as: Snellen or LogMAR charts. LEA or HOTV symbols (for pediatrics). Worth 4-Dot, fixation targets, accommodative or fusion stimuli. No internal optotypes — prisms simply alter image position for binocular response evaluation. |
| Scaling / Spacing | Loose Prism Set : Individual prisms marked in prism diopters (Δ), typically 1Δ to 40Δ or 22Δ depending on set configuration. Each piece can be stacked or combined to create custom powers. Markings indicate power and base direction (reversible). Prism Bar Set : Fixed prism sequence with engraved power markings on each segment. Horizontal bar: for base-in / base-out (convergence/divergence). Vertical bar: for base-up / base-down testing. Standard scale increments 1Δ, 2Δ, 3Δ, 4Δ, 5Δ, 6Δ, 8Δ, 10Δ, 12Δ, 14Δ, 16Δ, 18Δ, 20Δ, 25Δ, 30Δ, 35Δ, 40Δ. |
| Range of Acuity / Line Sizes | Works with any acuity target — from large (20/200) to fine detail (20/20 or better). Maintains optical clarity with minimal distortion across prism powers. High-quality prisms allow use with small letters or fine fixation points without image blur or chromatic aberration. |
| Testing Distance | Suitable for distance (6 m / 20 ft) and near (33–40 cm) testing. Also used at intermediate distances (1–3 m) for specific vergence or adaptation procedures. Optical displacement remains proportional and consistent across distances. |
| Physical Size & Dimensions | Loose Prism Set : Each prism: approx. 30–35 mm (L) × 20–25 mm (W); thickness varies with power (3–18 mm). Set case: ~25 × 18 × 4 cm, foam or velvet-lined interior. Prism Bars : Each bar: ~15–18 cm long × 2–3 cm wide. Horizontal and Vertical bars may have detachable or fixed handles for ease of use. Weight per bar: ~100–200 g (depends on material). |
| Mounting / Display Features | Loose prisms: handheld or used in trial frames; reversible for changing base direction. Prism bars: come with ergonomic handle/holder for stability during testing. Both are supplied in protective, foam-lined cases for safe organization and easy access. Clear laser engraving or printed labels on each prism or bar segment. |
| Included Accessories / Extras | Loose Prism Set: 22 reversible prisms (1Δ–40Δ typical range). Hard protective case. Cleaning cloth and usage instructions. Optional handle attachments. Prism Bar Set: 1 Horizontal bar + 1 Vertical bar. Storage case. Power chart or calibration guide. Optional calibration certificate for professional models. |
| Durability / Material Qualities | Material Options: Optical Crown Glass: high precision, scratch-resistant, ideal for clinical use. Acrylic (PMMA) or Polycarbonate: lightweight, impact-resistant, safer for pediatrics or travel. Finish : Smooth polished optical faces with bevelled edges. Longevity : Glass sets can last decades with proper handling. Acrylic sets more durable to impact but may scratch faster. Storage : Cases lined with foam or velvet to prevent chipping, dust, and moisture exposure. |
| Usability / Marker of Quality | Usability : Clearly marked prism diopters and base directions. Ergonomic handle on bars ensures steady hand placement. Compatible with trial frames, occluders, and binocular vision testing instruments. Compact and portable for clinics, vision therapy rooms, or academic labs. Markers of Quality: Optical accuracy within ±0.25Δ (low powers) and ±0.5Δ (high powers) tolerance. ISO-certified manufacturing and CE marking. Uniform spacing and labeling for consistent performance. Calibration or quality certificate (for clinical-grade sets). Strong protective casing with labelled slots. |
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