one of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis,creating the area of greatest visual acuity是什么意思_one of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis,creating the area of greatest visual acuity在线翻译_英语_读音_用法_例句