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The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens, which refracts light rays so that a point source of light is seen as a line or streak of light. Due to the optical properties, the streak of light is seen perpendicular to the axis of the cylinder.
The Maddox rod is an eye test used to detect and measure heterotropias (tropias) and heterophorias (phorias). It is a dissociating test or an evaluation where the patient is presented with different objects for each eye to look at such that the images can't be merged.
Maddox rod shown with the ridges held vertically, which causes the patient to see a horizontal line. In this example, the light seen by the left eye is under the line, indicating a left hyperdeviation increasing on down right gaze.
Nov 14, 2022 · The Maddox Rod is an optical tool that is made of red glass and has a number of cylinder-shaped streaks on it. It's a common technique for assessing heteroph...
Jul 5, 2024 · Maddox Rod is a glass rod (series of parallel glass rods) that converts the image of a spot-light source into a streak of light perpendicular to the axis of the rod due to its optical property. The position of this streak in relation to the spot-light source seen by the fellow eye indicates the presence and amount of Tropia/Phoria.
Jun 8, 2019 · This video shows how to do the Maddox Rod test and how it relates to other binocular vision tests like convergence and ocular muscle trigger points. Symptoms...
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Feb 29, 2024 · Further assessment can be done with a Maddox rod and prisms, a sensitive clinical test for obtaining a quantitative measurement of the pattern and degree of misalignment. The double Maddox rod test helps identify and quantify torsional misalignment when vertical diplopia is present.
The prism and alternate cover test is used to quantify misalignment of the eyes in primary position, side gazes, and head tilts. Smaller deviations may be quantified using prisms and a Maddox rod or red filter. Using these measurements: Determine which eye is hypertropic in primary position.
The Maddox rod is a lens with serial prisms aligned evenly to convert a point of light into a line 90 degrees away from the meridian of the prims. In a double maddox rod test, two lenses of different color are used.
