Description
Plastic
Beads
Nylon
String
Beads
wood
Therapeutic
heavier cords
Product description
- Purpose: The lens contains a series of plano-convex parallel cylinders that distort a point of light into a thin streak, which allows the optometrist to assess eye alignment and ocular torsion.
- Color: This specific product is white (clear), while other common variations are red and green. White is often used with a red Maddox in the other eye to perform the “double Maddox rod” test for assessing ocular torsion.
| Topic | Discription |
| Purpose / Target Users | Maddox rods (and lenses) are used in orthoptic/strabismus work to assess eye alignment, ocular torsion, and heterophoria/heterotropia. So the primary users are optometrists/ophthalmologists doing binocular vision/orthoptic tests, rather than purely refractive work. |
| Optotypes / Symbols | Usually no standard optotype. Instead the patient sees a line (or streak) of light when using the Maddox lens, and the clinician uses that to measure deviation. For example, one listing says: “These individual replacement trial lenses … designed to measure a patient’s ocular torsion.” |
| Scaling / Spacing | Since the purpose is alignment rather than acuity measurement, line spacing is likely fixed and the test is more about position of the line vs a fixation target rather than resolving letters. |
| Testing Distance | Many orthoptic tests are done at near (e.g., 33 cm) or distance (e.g., 6 m) depending on the test. The listing does not specify which distance is assumed for use of this particular Maddox lens. You should confirm with the supplier. |
| Physical Size & Portability | The overall dimensions (diameter, thickness) of the trial ring lens are not listed in the public spec I found. Standard trial lens diameter is often ~38 mm for many sets. |
| Mounting / Display Features | We know it mounts in a trial ring for trial frames, but details like whether it has a handle, notch or index mark, or what colours/markings are on the rim are missing for this specific SKU. |
| Included Accessories / Extras | No mention of additional accessories packaged with it (e.g., case, cleaning cloth, spare rings etc) in the public listing. |
| Durability / Material Qualities | Because the specification is minimal, check with vendor whether the lens is optical glass or acrylic/plastic, its scratch resistance, how the rim/trial ring is finished (metal/plastic), and how robust the fit is for repeated use. |
| Usability / Marker of Quality | Markers of good quality would include: clear streak (no optical defects), consistent orientation (45°/90°), durable mounting so the lens doesn’t shift or rotate in the trial ring, standard size compatible with trial frames, marked rim for quick identification (e.g., colour or engraving), and ideally some certification (CE, ISO) or from a known brand in ophthalmic equipment. |
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