公开(公告)号：US3802768A

公开(公告)日：1974-04-09

申请号：US35364973

申请日：1973-04-23

Applicant: TROPEL

Inventor： CLAPHAM T ,  HORWITZ J ,  ROBINSON B ,  MUNNERLYN C

IPC: A61B3/10 ,  A61B3/103 ,  A61B5/11 ,  G01J5/28

CPC classification number: A61B3/103 ,  A61B3/10 ,  A61B5/1103 ,  A61B5/7239

Abstract: The inventive method compensates for blinks occurring during examination of the eye by an objective refractor. An analog signal is produced as a function of the focus of a light pattern reflected from the eye, and the signal is processed and fed to an analyzer for determining the refractive error of the eye. The input to the analyzer is delayed to follow the analog signal by a predetermined delay. Meanwhile, any rate of change of the analog signal exceeding a predetermined thresh-hold is detected to represent the beginning of a blink, and a blink commencement signal is produced and used to stop the examination of the eye for a predetermined blink interval exceeding the expected duration of the blink. Also, the analyzer ignores the portion of the analyzer input devoted to the blink interval.

Abstract translation: 本发明的方法补偿由目标折射仪检查眼睛期间发生的眨眼。 产生作为从眼睛反射的光图案的焦点的函数的模拟信号，并且处理信号并将其馈送到用于确定眼睛的屈光不正的分析器。 延迟到分析仪的输入以遵循模拟信号预定的延迟。 同时，检测到超过预定阈值保持的模拟信号的任何变化率以表示眨眼的开始，并且产生眨眼开始信号，并用于停止超过预期的预定眨眼间隔的眼睛检查 眨眼持续时间 此外，分析仪也会忽略分析仪输入部分，用于闪烁间隔。