The disc-fovea angle (DFA) is used as a relevant indicator of ocular torsion change in cyclovertical strabismus. However, interpretation of the variation in time must differentiate whether a real change has occurred or if the disparity is due to random measurement error. The aim of the study was to obtain the minimal detectable change (MDC) of the DFA. It represents the minimal variation between two measurements that may be considered a real ocular torsion change.

中文翻译：

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用于眼扭转评估的视盘中央凹角度的最小可检测变化

圆盘中央凹角 (DFA) 被用作睫状体垂直斜视中眼球扭转变化的相关指标。然而，对时间变化的解释必须区分是否发生了真正的变化，或者差异是否是由于随机测量误差造成的。该研究的目的是获得 DFA 的最小可检测变化 (MDC)。它表示两个测量值之间的最小变化，可以被认为是真实的眼扭转变化。