Purchase this article with an account.
Ana Barrio, Beatriz Antona, Isabel Sanchez, Francisco Barra, Enrique Gonzalez, Angel Gutierrez, Yolanda Martin, Guadalupe Gonzalez; Inter-session and Inter-examiner Repeatability in Stereoacuity Measurements. Invest. Ophthalmol. Vis. Sci. 2012;53(14):1774.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Although many stereoacuity tests are used in clinical practice, their ability to detect changes of clinical significance is unknown since this requires knowledge of the repeatability of the measures made using each of the tests. The objective of this study was to determine the inter-examiner and intra-examiner repeatability of stereoacuity measurements made using one the most widely used tests: Frisby (real depth), TNO (random-dot), Randot circles (contour test). The working hypothesis was that repeatability is likely to considerably vary such that the tests may not be interchanged.
Stereoacuity was measured using the three methods in two different sessions by two examiners. The sample was composed by two groups of subjects: 110 young adults (mean age 19.2 years, range 18 to 25 years) and 26 absolute presbyopes (mean age 63.3 years, range 56 to 73 years). The repeatability of the tests was estimated by the Bland and Altman method. We determined the mean difference (MD) and the 95% limits of agreement (coefficient of repeatability, COR).
Table 1 and Table 2 show respectively the inter-session and inter-examiner repeatability results obtained for the three stereoacuity tests. TNO and Randot tests showed statistically significant learning effect (see Table 1).
The Randot test was the most repeatable test, showing the smallest inter-session and inter-examiner COR.
This PDF is available to Subscribers Only