大鼠不同颜色光视网膜电图特点

目的：探索正常SD大鼠及视网膜锥体失功能(RCD)大鼠不同颜色光视网膜电图特点及其可能存在的诊断价值。

方法：成年雄性SD大鼠及RCD大鼠，各6只，分别进行红、白、绿及蓝色光的视网膜电图记录，刺激所用的红光波长为625nm，绿光波长为525nm，蓝光波长为470nm，白光为混合光。

结果：正常SD大鼠各颜色光ERG表现为短波长的绿光及蓝光刺激条件下波幅值较红光及白光高； 而RCD大鼠各颜色光暗适应ERG的b波波幅值无显著差别，但各颜色光的波幅值均小于SD大鼠； 而各颜色光明适应ERG均未记录到明显波形。

结论：大鼠对短波长的绿光及蓝光较为敏感，建议可使用蓝光或者绿光作为大鼠视网膜电图记录的刺激光源。RCD大鼠对各颜色光无特异性的反应，尚不能用颜色光视网膜电图作为其特异的诊断指标。

Features of electroretinogram on rat under different color stimulation

AIM: To research the feature of normal SD rat and retinal cone dysfunction(RCD)rat electroretinogram(ERG)under different color stimulation and to explore its possible diagnostic value.

METHODS: Six male SD rats and six RCD rats were used, all of which were mature rats. They were stimulated by red, white, blue and green light and the ERG was recorded. The wavelength of red, green and blue light were 625nm, 525nm and 470nm respectively and the white light was mixed by three color light.

RESULTS: The response of ERG in normal SD rat under green and blue light stimulation were stronger than under red and white stimulation. The dark-adapted ERG of RCD rat responsed to color stimulation was similar to the ERG of normal SD rat, but the amplitude under each color stimulation was lower than that of normal SD rat. Light-adapted ERG response was hardly detected waveform.

CONCLUSION: Rat is sensitive to blue and green light, which can be used as a suggested light stimulation in the ERG recording. The ERG of RCD rat is not specific for color stimulation, and at present we could not use color ERG as a diagnostic indicator.