| Topic | Details |
| Purpose / Target Users | The White Maddox Lens is a diagnostic lens used in binocular vision and orthoptic testing to evaluate ocular alignment, heterophoria, heterotropia, and ocular torsion. It converts a point light source into a white streak of light, enabling clinicians to dissociate the eyes and assess horizontal or vertical deviations. The primary users are optometrists, ophthalmologists, and orthoptists performing binocular vision examinations. |
| Optotypes / Symbols | The White Maddox Lens does not use optotypes such as letters or symbols. Instead, it consists of multiple cylindrical optical elements that transform a point light into a straight luminous white line, which acts as the visual stimulus during alignment testing. |
| Scaling / Spacing | The lens contains closely spaced parallel cylindrical grooves that refract incoming light to produce a streak perpendicular to the orientation of the grooves. The spacing and optical design are standardized to ensure consistent streak formation for accurate binocular alignment assessment. |
| Range of Acuity / Line Sizes | Not applicable. The White Maddox Lens is not designed for visual acuity measurement, so it does not include acuity scales or line sizes such as 6/6 or 20/20. Its function is limited to binocular dissociation and ocular deviation evaluation. |
| Testing Distance | The White Maddox Lens may be used for distance testing (typically around 6 meters / 20 feet) or near testing (approximately 33–40 cm) depending on the clinical examination protocol. It is usually used with a penlight or fixation target during Maddox testing procedures. |
| Physical Size & Dimensions | The lens is commonly produced in standard trial lens size (approximately 38 mm diameter) to fit most optometric trial frames. It is lightweight and compact, making it convenient for routine use in clinics, hospitals, and portable examination kits. |
| Mounting / Display Features | The White Maddox Lens is typically supplied as a drop-in trial lens that fits into a standard trial frame lens holder. The cylindrical grooves can be oriented horizontally or vertically to generate vertical or horizontal streaks, allowing assessment of different ocular deviations. |
| Included Accessories / Extras | The White Maddox Lens is generally supplied as a single diagnostic lens compatible with standard trial frames. It is often used together with prism bars, Maddox rods, fixation lights, or phoria measuring devices during binocular vision testing. |
| Durability / Material Qualities | High-quality White Maddox lenses are typically manufactured from precision optical plastic or glass with finely molded cylindrical grooves. The lens is mounted in a durable rim designed for frequent clinical handling and repeated insertion into trial frames. |
| Usability / Marker of Quality | A well-manufactured White Maddox Lens produces a sharp, bright streak with minimal optical distortion, ensuring accurate binocular alignment testing. Quality lenses are compatible with standard optometric trial frames and are designed to provide consistent and reliable clinical performance. |
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