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- W2017282444 abstract "Over the years since the initial accep tance of tonography as a useful tool in the evaluation of the potentially glaucomatous patient, many attempts have been made either to improve on its value or to dis pute 1 0 its importance. Among the numer ous investigations on the subject have been suggestions that alteration in the length of tonography or refinement of the mathematic calculation of the coefficient of out flow might be worthwhile. Most of these efforts^roved t 0 D e 0f g r e a t interest but appeared to have little practical advantage when compared with the conventional ap proach. Although the theory of tonography does not require a four-minute test time, this period has become relatively standard. In contrast, however, Leydhecker has pro posed that a longer tonographic measure ment is of greater assistance in the differ entiation of normal from glaucomatous eyes. In his method, the test is extended to seven minutes. Instead of then determin ing the C value in the standard way, only the last four minutes of the tracing are used along with Friedenwald's nomograms to obtain a C(3-7)Finally, the quotient P3/C(3_7) is found by dividing the pressure at the end of three minutes (P3) by the co efficient of outflow from that point to the end of the seventh minute C(3-7>Despite a comparatively large overlap in the dis tribution of P3/Cf3-7) for normal and glau comatous eyes (Table 1), Leydhecker stated that my test is at present the most" @default.
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- W2017282444 date "1974-11-01" @default.
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- W2017282444 title "Negative Findings on the Seven-Minute Coefficient of Outflow" @default.
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- W2017282444 doi "https://doi.org/10.1016/0002-9394(74)90309-2" @default.
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