Description
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Product description
- The Red Maddox Lens (for Trial Frames) is a dissociating lens that turns a point light into a high-visibility red line, making subtle horizontal or vertical phorias/tropias easy to detect and measure. It drops into standard 38 mm trial frames and, used with a penlight and prism neutralization, provides a fast, repeatable prism-diopter reading at distance or near: if the red line doesn’t pass through the light, add prism until it does—then record Δ and base.
- What it does: Converts a point → red line to reveal latent/manifest deviations (eso/exo; hyper/hypo)
- Why red: Bright, high-contrast cue that patients identify quickly; excellent for dim-room testing
- Trial-frame ready: Standard 38 mm cell fits universal/titanium frames; quick insert/remove during binocular workups
- Orientation options: Place striations horizontal (tests vertical deviation) or vertical (tests horizontal deviation)
- Quick workflow: Dim room → patient fixates penlight → position lens (H/V) over one eye → note line vs. light → neutralize with loose/prism bar → record Δ & base
- Use cases: Distance/near phoria measurement, diplopia analysis, cyclovertical assessments, pre/post-treatment comparisons
- Great pairings: Prism Bar Set or Loose Prism Set, LED/blue-white penlight, occluder for cover/alternate-cover testing
- Accuracy tips: Center over the visual axis, align striations precisely, keep fixation steady; repeat to confirm consistency
- Care: Clean with lens-safe solution and a soft cloth; avoid solvents/scratches; store in a protective sleeve to keep striations pristine
| Topic | Details |
| Purpose / Target Users | The Green Maddox Lens is a diagnostic accessory used in binocular vision assessment to detect ocular misalignment such as phorias and tropias. It converts a point light source into a green streak of light, helping clinicians evaluate horizontal or vertical deviations when used with prisms or other Maddox testing tools. It is commonly used by optometrists, ophthalmologists, orthoptists, and vision therapy specialists during binocular vision examinations. |
| Optotypes / Symbols | The Green Maddox Lens does not use optotypes such as letters or symbols. Instead, it consists of a cylindrical lens structure that converts a point light into a straight luminous green line, allowing dissociation of binocular vision for alignment assessment. |
| Scaling / Spacing | The lens contains multiple fine cylindrical grooves arranged parallel to each other. These grooves refract incoming light to form a uniform streak perpendicular to the orientation of the grooves. The optical design ensures consistent streak formation for accurate binocular deviation evaluation. |
| Range of Acuity / Line Sizes | Not applicable. The Green Maddox Lens is not intended for visual acuity measurement and therefore does not contain acuity scales or optotype line sizes such as 6/6 or 20/20. Its primary function is ocular alignment testing and binocular dissociation. |
| Testing Distance | The Green Maddox Lens is typically used at distance fixation (approximately 6 meters / 20 feet) or near fixation (around 33–40 cm) depending on the clinical procedure. It is commonly used with a penlight, fixation target, or phoria measurement setup. |
| Physical Size & Portability | The lens is designed in a standard trial lens size (approximately 38 mm diameter) so it can fit into most standard optometric trial frames. It is lightweight and portable, making it suitable for routine clinical use and portable examination kits. |
| Mounting / Display Features | The Green Maddox Lens is typically a drop-in trial lens designed to fit into a trial frame lens holder. The cylindrical grooves may be oriented horizontally or vertically to produce vertical or horizontal streaks, allowing clinicians to measure horizontal or vertical ocular deviations. |
| Included Accessories / Extras | The Green Maddox Lens is generally supplied as a single diagnostic lens compatible with standard trial frames. It is often used alongside prism bars, Maddox rods, penlights, or fixation targets for comprehensive binocular vision testing. |
| Durability / Material Qualities | High-quality Green Maddox lenses are manufactured from precision optical plastic or glass with finely molded cylindrical grooves. The lens is mounted in a durable rim designed for frequent insertion and removal from trial frames in clinical environments. |
| Usability | The drop-in trial lens design allows quick placement into standard trial frames, making it easy for clinicians to integrate into routine binocular vision examinations. Its compact design ensures convenient handling and efficient switching during diagnostic procedures. |
| Marker of Quality | A well-manufactured Green Maddox Lens provides sharp, well-defined streak formation and consistent optical performance. Quality lenses are designed to meet professional clinical standards and are compatible with standard optometric trial frames and diagnostic testing protocols used worldwide. |
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