Stereopsis is the visual appreciation of depth during binocular viewing, stimulated by retinal disparity. 1 Stereoacuity tests seek to determine the smallest amount of recognizable retinal disparity in seconds of arc. e measurement of stereoacuity is an important tool in the assessment of binocular function and has widely been used for the detection and management of strabismus, amblyopia and anisometropia.2-4 e response to stereoacuity testing is an important tool in the screening process for patients with suspected strabismus. Stereotests are also often used for occupational purposes to qualify individuals for a particular profession. Ideally, a stereoacuity test would be void of any monocular clues, as these would give an invalid result indicating some degree of stereopsis where none exists. ere have been numerous reports in the literature examining the presence of non-stereoscopic clues in commonly used stereotests. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]24,25 Stereoacuity testing is typically performed by eye care professionals and other health/occupational professionals. e level of stereoacuity that cannot be obtained monocularly is of interest to all testers and interpreters of the results to provide a level of confidence that the result obtained represents stereopsis. A straightforward experimental method to determine the presence of monocular clues is to administer the test under monocular viewing conditions. We sought to quantify the presence of monocular clues in the Titmus, Randot®, Randot® Special Edition, Randot® Preschool, Lang, Lang II, and the Frisby stereoacuity tests and determine the "absolute value" (AV) for each stereotest that could not be obtained monocularly. e AV result was not obtained by any of the subjects under monocular conditions. It is hypothesized that the AV represents a result that can only be obtained binocularly through stereopsis. We also sought to compare the monocular results of a group with normal stereopsis and a group Monocular Clues in Seven StereotestsErik Hahn, David Comstock, Stacey Durling, James MacCarron, Safiah Mulla, Paula James, Robert LaRoche Eye Care Team, IWK Health Centre AbstractPurpose: There have been numerous reports with evidence detailing the presence of non-stereoscopic or "monocular" clues in commonly used stereoacuity tests. The purpose of this study was to quantify the influence of monocular clues in the Titmus, Randot®, Randot® Special Edition, Randot® Preschool, Lang, Lang II, and Frisby stereoacuity tests. Stereoacuity testing is typically performed and/or interpreted by eye care professionals and other health/ occupational professionals. Methods: Two separate prospective studies were conducted. The first assessed the monocular responses of 100 subjects aged 8 to 67 with normal stereoacuity, and no previous exposure to any of the seven tests administered. The second assessed the monocular responses of 33 subjects aged 8 to 65 with longstanding, manifest, horizontal strabismus of 20 prism diopters or greater, on t...
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