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目的对弱视儿童的双眼视平衡点进行评估。设计前瞻性病例系列。研究对象眼位正常的轻度、中度、重度弱视儿童各30例。方法应用基于计算机平台的视感知觉检查方法对弱视儿童的双眼视平衡点进行检测。采用信号点闪烁光和非闪烁光图形刺激,对信号噪声比和信号对比度进行检测。主要指标动静态信噪比平衡点值及动静态对比度平衡点值。结果(1)轻、中、重度弱视儿童静态信噪比的平衡点值分别为(6.17±1.548)级、(5.51±1.804)级、(2.08±0.935)级(H=51.526,P<0.001);动态信噪比的平衡点值分别为(6.42±1.334)级、(5.73±1.840)级、(2.34±1.260)级(H=58.453,P<0.001);静态对比度的平衡点值分别为(7.08±2.350)级、(6.44±2.520)级、(3.52±2.365)级(H=26.826,P<0.001);动态对比度的平衡点值分别为(7.40±2.430)级、(7.13±2.554)级、(3.31±2.007)级(H=42.200,P<0.001)。(2)轻、中、重度弱视儿童静态信噪比双眼间级别的差值分别为(1.67±1.561)级、(2.20±1.584)级、(4.71±2.312)级(H=20.873,P<0.001);动态信噪比双眼间级别的差值分别为(1.33±1.241)级、(1.90±1.739)级、(4.52±2.293)级(H=26.684,P<0.001);静态对比度双眼间级别的差值分别为(2.67±1.709)级、(2.73±2.651)级、(5.48±3.329)级(H=11.116,P=0.004);动态对比度双眼间级别的差值分别为(2.50±2.080)级、(2.72±2.534)级、(5.00±3.327)级(H=10.396,P=0.006)。结论眼位正位的弱视儿童其信噪比平衡点值及对比度平衡点值均存在异常,弱视程度越深,异常越严重。动静态信噪比及动静态对比度在双眼间级别的差值随弱视程度的加深而增大。
Objective To evaluate the binocular visual balance of amblyopia children. Design prospective case series. The subjects were normal eyesight mild, moderate and severe amblyopia in 30 children. Methods Visual acuity test method based on computer platform was used to detect binocular visual balance point of amblyopia children. Signal point flashing and non-flashing light pattern stimuli are used to detect signal-to-noise ratio and signal contrast. Main indicators of static and dynamic signal to noise ratio balance point value and dynamic and static contrast balance point value. Results (1) The static signal to noise ratio of the children with mild, moderate, and severe amblyopia were 6.17 ± 1.548, 5.51 ± 1.804 and 2.08 ± 0.935 respectively (H = 51.526, P <0.001) (6.42 ± 1.334), (5.73 ± 1.840) and (2.34 ± 1.260) respectively (H = 58.453, P <0.001). The balance points of static contrast were ( 7.03 ± 2.350, 6.44 ± 2.520 and 3.52 ± 2.365 respectively (H = 26.826, P <0.001). The balance points of dynamic contrast were (7.40 ± 2.430), (7.13 ± 2.554) , (3.31 ± 2.007) grade (H = 42.200, P <0.001). (2) The differences of static signal-to-noise ratio between eyes of mild, moderate and severe amblyopia were (1.67 ± 1.561), (2.20 ± 1.584) and (4.71 ± 2.312) ), And the differences of binocular dynamic signal-to-noise ratio were 1.33 ± 1.241, 1.90 ± 1.739 and 4.52 ± 2.293 respectively (H = 26.684, P <0.001) (2.67 ± 1.709), (2.73 ± 2.651), (5.48 ± 3.329), respectively (H = 11.116, P = 0.004). The differences between the two groups in the dynamic contrast were (2.50 ± 2.080) , (2.72 ± 2.534), (5.00 ± 3.327) (H = 10.396, P = 0.006). Conclusion The amblyopic children with amblyopic eyes at the position of the eye have abnormalities of signal-to-noise ratio balance and contrast balance. The deeper the degree of amblyopia, the more serious the abnormality. Dynamic and static signal-to-noise ratio and dynamic and static contrast in the binocular level difference with the degree of amblyopia deepened and increased.