Which test utilizes a red-green filter to determine if a patient has myopia that is not sufficiently corrected?

The Duochrome Test is specifically designed to assess a patient's refractive error, primarily focusing on myopia (nearsightedness) and hyperopia (farsightedness). This test employs a red-green filter and presents two different color backgrounds—one red and one green. The patient views a target (usually a letter or symbol) against these backgrounds to determine which color they see the clearest letters on.

When evaluating a patient's vision, the test helps establish if the current prescription adequately corrects their myopia. If the patient sees clearer letters on the green background, it suggests that they are under-corrected for myopia. Conversely, if they see better on the red background, it may indicate an adequate correction or preference for the hyperopic correction. By analyzing the responses with the red-green filter, practitioners can make informed decisions about necessary adjustments to the prescription.

This method is efficient and effectively identifies under-correction or over-correction, leading to appropriate outcomes for the patient's optical needs. The other tests mentioned do not use the same methodology or tools that specifically examine refractive errors in this manner.