Which tool is used to assess phorias and consists of a series of red cylinders?

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The Maddox rod is specifically designed to assess phorias, which are latent deviations of the eyes that can be present when binocular vision is disrupted. This tool consists of a series of red cylinders that are used to introduce a controlled misalignment in the visual field, allowing examiners to measure the degree of phoria. When the red light created by the rod is misaligned, the subject perceives two lights, enabling the practitioner to evaluate how the eyes work together under different conditions.

In contrast, the phoropter is primarily utilized to measure refractive error and determine the best corrective lenses for a patient, rather than specifically assessing phorias. The optometer focuses on measuring visual acuity and refractive error, while the trial frame is designed for fitting corrective lenses but doesn’t provide the specific phoria assessment that the Maddox rod does. By using the Maddox rod, clinicians can effectively diagnose and manage conditions related to eye alignment and binocular vision, making it an essential tool in this context.

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